binary voltage multiplier...

torsdag den 28. juli 2022 kl. 17.36.08 UTC+2 skrev jla...@highlandsniptechnology.com:
On Thu, 28 Jul 2022 10:46:12 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

jla...@highlandsniptechnology.com wrote:
On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:

On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

jla...@highlandsniptechnology.com wrote:

https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1

Fun. Of course with the right parts, you can do 2**N multiplication
with N stages. (Does require using the relays for commutation, of course.)

Cheers

Phil Hobbs
This circuit can do a 2^N step high-voltage supply with N low voltage,
cheap telecom relays. Maybe an incremental linear reg could
interpolate between the steps.

regulate the input?

Sure. The source could be something like an LTC3803 (geat part) and a
standard transformer, one of the DRQ things.

We had one inquiry for a HV supply that was pretty time-agile, which
would need a linear reg.

Frankly, I\'d rather not be in the HV business. Too much to go wrong.

This stepped C-W was just a goofy idea.

This topology uses isolation transformers with dual secondaries:

https://imgur.com/a/XRoYq2V

I _think_ I got the dots right...

I think that untangles into a 360 volt transformer and a half-wave
doubler.
Ya that sounds right. An old trick in the National Semi handbook from
the 70s I think it was, for regulation on the secondary is to wrap an
LM317 inside the grid to cathode voltage of a power triode and that
works OK for regulating up to a couple kV at low currents without too
much thought on how to provide an appropriate reference and error amp
for the potentials on that side.

Long lead times on many N fets with Vds > 1kV, not surprising I guess.
Lately we don\'t run line AC into boxes, or use line frequency
transformers. Too many safety and compliance isues, too much weight
and cost.
Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
readily available up to 100 watts or so

much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684

Phihomg and MeanWell make warts (big plugs) at 60 watts.


All you need is a power bar with the outlets in the right orientation.
The one over my bench is a very nice 20x Tripplite one, with filtering
and MOVs, but the prongs are oriented horizontally, so that most warts
take up two spaces.

Cheers

Phil Hobbs
We\'re shipping rackmount boxes to a big govt facility. They have a
group in charge of safety and compliance and all that stuff and would
have set us back 6 months and maybe $40K in lab fees if we ran AC into
the box. An external 24 volt 2.5-amp laptop-type supply just fixed the
problem... no complaints from the users.

https://www.dropbox.com/s/vjzhoths9v55gpq/Man_Front_1.jpg?raw=1

It pulls about 2 amps until the giant EOM oven heats up, maybe 15
minutes.

The power connector on the back is the usual barrel, but it\'s threaded
for optional mechanical locking.
Click to expand...

the big Meanwell comes with an 8 pin minifit-jr or 4 pin XLR, both are locking
 
On Thu, 28 Jul 2022 11:08:39 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

torsdag den 28. juli 2022 kl. 17.38.47 UTC+2 skrev jla...@highlandsniptechnology.com:
On Thu, 28 Jul 2022 08:33:17 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

torsdag den 28. juli 2022 kl. 16.23.22 UTC+2 skrev jla...@highlandsniptechnology.com:
On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:

On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

jla...@highlandsniptechnology.com wrote:

https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1

Fun. Of course with the right parts, you can do 2**N multiplication
with N stages. (Does require using the relays for commutation, of course.)

Cheers

Phil Hobbs
This circuit can do a 2^N step high-voltage supply with N low voltage,
cheap telecom relays. Maybe an incremental linear reg could
interpolate between the steps.

regulate the input?

Sure. The source could be something like an LTC3803 (geat part) and a
standard transformer, one of the DRQ things.

We had one inquiry for a HV supply that was pretty time-agile, which
would need a linear reg.

Frankly, I\'d rather not be in the HV business. Too much to go wrong.

This stepped C-W was just a goofy idea.

This topology uses isolation transformers with dual secondaries:

https://imgur.com/a/XRoYq2V

I _think_ I got the dots right...

I think that untangles into a 360 volt transformer and a half-wave
doubler.
Ya that sounds right. An old trick in the National Semi handbook from
the 70s I think it was, for regulation on the secondary is to wrap an
LM317 inside the grid to cathode voltage of a power triode and that
works OK for regulating up to a couple kV at low currents without too
much thought on how to provide an appropriate reference and error amp
for the potentials on that side.

Long lead times on many N fets with Vds > 1kV, not surprising I guess.
Lately we don\'t run line AC into boxes, or use line frequency
transformers. Too many safety and compliance isues, too much weight
and cost.
Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
readily available up to 100 watts or so

much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684
Phihomg and MeanWell make warts (big plugs) at 60 watts.

lots of 65W USB-C chargers like this: https://www.pricerunner.dk/product/640x640/3002755304/Baseus-GaN2-Lite-Quick-Charge-Travel-Charger.jpg
Yikes. GaN fets are changing things. I wonder what the switching
frequency is.

What\'s the output voltage? Surely not 5.

The 65W is at 20V
the USB-C is \"Power Delivery\", so it starts at as normal USB 5V/900mA
and then as requested switches to 5,9,12,15 or 20V little over 3A
Click to expand...

I need to look into that. I\'m thinking about a product line of little
blue box signal conditioners, aerospace things, and a USB power
connector would be cool. But I think some negotiation has to be done
to get more than the minimum 5 watts. And maybe some older PCs and
laptops can\'t do more.

There\'s probably a good book somewhere.
 
Lasse Langwadt Christensen <langwadt@fonz.dk> wrote:

> torsdag den 28. juli 2022 kl. 17.38.47 UTC+2 skrev

[...]

What\'s the output voltage? Surely not 5.

The 65W is at 20V
the USB-C is \"Power Delivery\", so it starts at as normal USB 5V/900mA
and then as requested switches to 5,9,12,15 or 20V little over 3A
Click to expand...

Amazon sells a 5V 12A USB charger for CDN$26.99:

https://www.amazon.ca/Charger-Rolvse-Charging-Station-
Compatible/dp/B09JWR84QF/

I don\'t need that much for my desk lamp, so I got a 32W version for
CDN$16.99:

https://www.amazon.ca/gp/product/B09R9RMV79

So they do exist.

However, USB-C cannot take the current:

https://m.media-amazon.com/images/I/61i8joCjpiL._CR0,204,1224,1224
_UX175.jpg



--
MRM
 
torsdag den 28. juli 2022 kl. 20.23.24 UTC+2 skrev John Larkin:
On Thu, 28 Jul 2022 11:08:39 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

torsdag den 28. juli 2022 kl. 17.38.47 UTC+2 skrev jla...@highlandsniptechnology.com:
On Thu, 28 Jul 2022 08:33:17 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

torsdag den 28. juli 2022 kl. 16.23.22 UTC+2 skrev jla...@highlandsniptechnology.com:
On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:

On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

jla...@highlandsniptechnology.com wrote:

https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1

Fun. Of course with the right parts, you can do 2**N multiplication
with N stages. (Does require using the relays for commutation, of course.)

Cheers

Phil Hobbs
This circuit can do a 2^N step high-voltage supply with N low voltage,
cheap telecom relays. Maybe an incremental linear reg could
interpolate between the steps.

regulate the input?

Sure. The source could be something like an LTC3803 (geat part) and a
standard transformer, one of the DRQ things.

We had one inquiry for a HV supply that was pretty time-agile, which
would need a linear reg.

Frankly, I\'d rather not be in the HV business. Too much to go wrong.

This stepped C-W was just a goofy idea.

This topology uses isolation transformers with dual secondaries:

https://imgur.com/a/XRoYq2V

I _think_ I got the dots right...

I think that untangles into a 360 volt transformer and a half-wave
doubler.
Ya that sounds right. An old trick in the National Semi handbook from
the 70s I think it was, for regulation on the secondary is to wrap an
LM317 inside the grid to cathode voltage of a power triode and that
works OK for regulating up to a couple kV at low currents without too
much thought on how to provide an appropriate reference and error amp
for the potentials on that side.

Long lead times on many N fets with Vds > 1kV, not surprising I guess.
Lately we don\'t run line AC into boxes, or use line frequency
transformers. Too many safety and compliance isues, too much weight
and cost.
Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
readily available up to 100 watts or so

much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684
Phihomg and MeanWell make warts (big plugs) at 60 watts.

lots of 65W USB-C chargers like this: https://www.pricerunner.dk/product/640x640/3002755304/Baseus-GaN2-Lite-Quick-Charge-Travel-Charger.jpg
Yikes. GaN fets are changing things. I wonder what the switching
frequency is.

What\'s the output voltage? Surely not 5.

The 65W is at 20V
the USB-C is \"Power Delivery\", so it starts at as normal USB 5V/900mA
and then as requested switches to 5,9,12,15 or 20V little over 3A

I need to look into that. I\'m thinking about a product line of little
blue box signal conditioners, aerospace things, and a USB power
connector would be cool. But I think some negotiation has to be done
to get more than the minimum 5 watts. And maybe some older PCs and
laptops can\'t do more.
Click to expand...

yes you need a pile of software* or a dedicated chip like these: https://www.amazon.com/Type-C-Trigger-Module-Supports-Output/dp/B08LDJBN8P/

it of course ties up the USB, but that doesn\'t really matter because so far I haven\'t seen any PCs or laptops
that supports more that the normal 5V output, only seen chargers and powerbanks that does that
 
On Thu, 28 Jul 2022 11:46:01 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Thu, 28 Jul 2022 10:46:12 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
langwadt@fonz.dk> wrote:

torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:

On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

jla...@highlandsniptechnology.com wrote:

https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1

Fun. Of course with the right parts, you can do 2**N multiplication
with N stages. (Does require using the relays for commutation, of course.)

Cheers

Phil Hobbs
This circuit can do a 2^N step high-voltage supply with N low voltage,
cheap telecom relays. Maybe an incremental linear reg could
interpolate between the steps.

regulate the input?

Sure. The source could be something like an LTC3803 (geat part) and a
standard transformer, one of the DRQ things.

We had one inquiry for a HV supply that was pretty time-agile, which
would need a linear reg.

Frankly, I\'d rather not be in the HV business. Too much to go wrong.

This stepped C-W was just a goofy idea.

This topology uses isolation transformers with dual secondaries:

https://imgur.com/a/XRoYq2V

I _think_ I got the dots right...

I think that untangles into a 360 volt transformer and a half-wave
doubler.
Ya that sounds right. An old trick in the National Semi handbook from
the 70s I think it was, for regulation on the secondary is to wrap an
LM317 inside the grid to cathode voltage of a power triode and that
works OK for regulating up to a couple kV at low currents without too
much thought on how to provide an appropriate reference and error amp
for the potentials on that side.

Long lead times on many N fets with Vds > 1kV, not surprising I guess.
Lately we don\'t run line AC into boxes, or use line frequency
transformers. Too many safety and compliance isues, too much weight
and cost.
Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
readily available up to 100 watts or so

much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684

Phihomg and MeanWell make warts (big plugs) at 60 watts.


All you need is a power bar with the outlets in the right orientation.
The one over my bench is a very nice 20x Tripplite one, with filtering
and MOVs, but the prongs are oriented horizontally, so that most warts
take up two spaces.

Cheers

Phil Hobbs

We\'re shipping rackmount boxes to a big govt facility. They have a
group in charge of safety and compliance and all that stuff and would
have set us back 6 months and maybe $40K in lab fees if we ran AC into
the box. An external 24 volt 2.5-amp laptop-type supply just fixed the
problem... no complaints from the users.

Yeah, we use warts too. Our standard one is an SL Power ME10A2403B01,
which comes with international plug adapters. It\'s overkill for most of
our stuff, except for some of the beefier TE coolers.


https://www.dropbox.com/s/vjzhoths9v55gpq/Man_Front_1.jpg?raw=1

Very pretty.
Click to expand...

Ugly. They insisted on black anodize. Highland Blue would have been
much better.

The LCD is an eval board. We couldn\'t get the lcd or the driver chips,
but lots of eval boards are available.
 
On Thu, 28 Jul 2022 11:15:27 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

torsdag den 28. juli 2022 kl. 17.36.08 UTC+2 skrev jla...@highlandsniptechnology.com:
On Thu, 28 Jul 2022 10:46:12 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

jla...@highlandsniptechnology.com wrote:
On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:

On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

jla...@highlandsniptechnology.com wrote:

https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1

Fun. Of course with the right parts, you can do 2**N multiplication
with N stages. (Does require using the relays for commutation, of course.)

Cheers

Phil Hobbs
This circuit can do a 2^N step high-voltage supply with N low voltage,
cheap telecom relays. Maybe an incremental linear reg could
interpolate between the steps.

regulate the input?

Sure. The source could be something like an LTC3803 (geat part) and a
standard transformer, one of the DRQ things.

We had one inquiry for a HV supply that was pretty time-agile, which
would need a linear reg.

Frankly, I\'d rather not be in the HV business. Too much to go wrong.

This stepped C-W was just a goofy idea.

This topology uses isolation transformers with dual secondaries:

https://imgur.com/a/XRoYq2V

I _think_ I got the dots right...

I think that untangles into a 360 volt transformer and a half-wave
doubler.
Ya that sounds right. An old trick in the National Semi handbook from
the 70s I think it was, for regulation on the secondary is to wrap an
LM317 inside the grid to cathode voltage of a power triode and that
works OK for regulating up to a couple kV at low currents without too
much thought on how to provide an appropriate reference and error amp
for the potentials on that side.

Long lead times on many N fets with Vds > 1kV, not surprising I guess.
Lately we don\'t run line AC into boxes, or use line frequency
transformers. Too many safety and compliance isues, too much weight
and cost.
Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
readily available up to 100 watts or so

much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684

Phihomg and MeanWell make warts (big plugs) at 60 watts.


All you need is a power bar with the outlets in the right orientation.
The one over my bench is a very nice 20x Tripplite one, with filtering
and MOVs, but the prongs are oriented horizontally, so that most warts
take up two spaces.

Cheers

Phil Hobbs
We\'re shipping rackmount boxes to a big govt facility. They have a
group in charge of safety and compliance and all that stuff and would
have set us back 6 months and maybe $40K in lab fees if we ran AC into
the box. An external 24 volt 2.5-amp laptop-type supply just fixed the
problem... no complaints from the users.

https://www.dropbox.com/s/vjzhoths9v55gpq/Man_Front_1.jpg?raw=1

It pulls about 2 amps until the giant EOM oven heats up, maybe 15
minutes.

The power connector on the back is the usual barrel, but it\'s threaded
for optional mechanical locking.

the big Meanwell comes with an 8 pin minifit-jr or 4 pin XLR, both are locking
Click to expand...

XLRs are great. I never understood why a microphone connector has,
like, 10 amp pins. What SPL makes 10 amps?
 
On 29/7/22 12:21, jlarkin@highlandsniptechnology.com wrote:
On Thu, 28 Jul 2022 11:15:27 -0700 (PDT), Lasse Langwadt Christensen
langwadt@fonz.dk> wrote:

torsdag den 28. juli 2022 kl. 17.36.08 UTC+2 skrev jla...@highlandsniptechnology.com:
On Thu, 28 Jul 2022 10:46:12 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

jla...@highlandsniptechnology.com wrote:
On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:

On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

jla...@highlandsniptechnology.com wrote:

https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1

Fun. Of course with the right parts, you can do 2**N multiplication
with N stages. (Does require using the relays for commutation, of course.)

Cheers

Phil Hobbs
This circuit can do a 2^N step high-voltage supply with N low voltage,
cheap telecom relays. Maybe an incremental linear reg could
interpolate between the steps.

regulate the input?

Sure. The source could be something like an LTC3803 (geat part) and a
standard transformer, one of the DRQ things.

We had one inquiry for a HV supply that was pretty time-agile, which
would need a linear reg.

Frankly, I\'d rather not be in the HV business. Too much to go wrong.

This stepped C-W was just a goofy idea.

This topology uses isolation transformers with dual secondaries:

https://imgur.com/a/XRoYq2V

I _think_ I got the dots right...

I think that untangles into a 360 volt transformer and a half-wave
doubler.
Ya that sounds right. An old trick in the National Semi handbook from
the 70s I think it was, for regulation on the secondary is to wrap an
LM317 inside the grid to cathode voltage of a power triode and that
works OK for regulating up to a couple kV at low currents without too
much thought on how to provide an appropriate reference and error amp
for the potentials on that side.

Long lead times on many N fets with Vds > 1kV, not surprising I guess.
Lately we don\'t run line AC into boxes, or use line frequency
transformers. Too many safety and compliance isues, too much weight
and cost.
Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
readily available up to 100 watts or so

much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684

Phihomg and MeanWell make warts (big plugs) at 60 watts.


All you need is a power bar with the outlets in the right orientation.
The one over my bench is a very nice 20x Tripplite one, with filtering
and MOVs, but the prongs are oriented horizontally, so that most warts
take up two spaces.

Cheers

Phil Hobbs
We\'re shipping rackmount boxes to a big govt facility. They have a
group in charge of safety and compliance and all that stuff and would
have set us back 6 months and maybe $40K in lab fees if we ran AC into
the box. An external 24 volt 2.5-amp laptop-type supply just fixed the
problem... no complaints from the users.

https://www.dropbox.com/s/vjzhoths9v55gpq/Man_Front_1.jpg?raw=1

It pulls about 2 amps until the giant EOM oven heats up, maybe 15
minutes.

The power connector on the back is the usual barrel, but it\'s threaded
for optional mechanical locking.

the big Meanwell comes with an 8 pin minifit-jr or 4 pin XLR, both are locking

XLRs are great. I never understood why a microphone connector has,
like, 10 amp pins. What SPL makes 10 amps?
Click to expand...

In the case of stage gear, it\'s not the amps, it\'s the newtons that
matter. Specifically of a drunk rock-star tripping over a cable without
interrupting whatever horrendous din they\'re making at the time.
 
On Fri, 29 Jul 2022 12:41:03 +1000, Clifford Heath
<no_spam@please.net> wrote:

On 29/7/22 12:21, jlarkin@highlandsniptechnology.com wrote:
On Thu, 28 Jul 2022 11:15:27 -0700 (PDT), Lasse Langwadt Christensen
langwadt@fonz.dk> wrote:

torsdag den 28. juli 2022 kl. 17.36.08 UTC+2 skrev jla...@highlandsniptechnology.com:
On Thu, 28 Jul 2022 10:46:12 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

jla...@highlandsniptechnology.com wrote:
On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:

On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

jla...@highlandsniptechnology.com wrote:

https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1

Fun. Of course with the right parts, you can do 2**N multiplication
with N stages. (Does require using the relays for commutation, of course.)

Cheers

Phil Hobbs
This circuit can do a 2^N step high-voltage supply with N low voltage,
cheap telecom relays. Maybe an incremental linear reg could
interpolate between the steps.

regulate the input?

Sure. The source could be something like an LTC3803 (geat part) and a
standard transformer, one of the DRQ things.

We had one inquiry for a HV supply that was pretty time-agile, which
would need a linear reg.

Frankly, I\'d rather not be in the HV business. Too much to go wrong.

This stepped C-W was just a goofy idea.

This topology uses isolation transformers with dual secondaries:

https://imgur.com/a/XRoYq2V

I _think_ I got the dots right...

I think that untangles into a 360 volt transformer and a half-wave
doubler.
Ya that sounds right. An old trick in the National Semi handbook from
the 70s I think it was, for regulation on the secondary is to wrap an
LM317 inside the grid to cathode voltage of a power triode and that
works OK for regulating up to a couple kV at low currents without too
much thought on how to provide an appropriate reference and error amp
for the potentials on that side.

Long lead times on many N fets with Vds > 1kV, not surprising I guess.
Lately we don\'t run line AC into boxes, or use line frequency
transformers. Too many safety and compliance isues, too much weight
and cost.
Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
readily available up to 100 watts or so

much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684

Phihomg and MeanWell make warts (big plugs) at 60 watts.


All you need is a power bar with the outlets in the right orientation.
The one over my bench is a very nice 20x Tripplite one, with filtering
and MOVs, but the prongs are oriented horizontally, so that most warts
take up two spaces.

Cheers

Phil Hobbs
We\'re shipping rackmount boxes to a big govt facility. They have a
group in charge of safety and compliance and all that stuff and would
have set us back 6 months and maybe $40K in lab fees if we ran AC into
the box. An external 24 volt 2.5-amp laptop-type supply just fixed the
problem... no complaints from the users.

https://www.dropbox.com/s/vjzhoths9v55gpq/Man_Front_1.jpg?raw=1

It pulls about 2 amps until the giant EOM oven heats up, maybe 15
minutes.

The power connector on the back is the usual barrel, but it\'s threaded
for optional mechanical locking.

the big Meanwell comes with an 8 pin minifit-jr or 4 pin XLR, both are locking

XLRs are great. I never understood why a microphone connector has,
like, 10 amp pins. What SPL makes 10 amps?

In the case of stage gear, it\'s not the amps, it\'s the newtons that
matter. Specifically of a drunk rock-star tripping over a cable without
interrupting whatever horrendous din they\'re making at the time.
Click to expand...

I think they are beer-proof too.
 
jlarkin@highlandsniptechnology.com wrote:
On Thu, 28 Jul 2022 11:46:01 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Thu, 28 Jul 2022 10:46:12 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
langwadt@fonz.dk> wrote:

torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:

On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

jla...@highlandsniptechnology.com wrote:

https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1

Fun. Of course with the right parts, you can do 2**N multiplication
with N stages. (Does require using the relays for commutation, of course.)

Cheers

Phil Hobbs
This circuit can do a 2^N step high-voltage supply with N low voltage,
cheap telecom relays. Maybe an incremental linear reg could
interpolate between the steps.

regulate the input?

Sure. The source could be something like an LTC3803 (geat part) and a
standard transformer, one of the DRQ things.

We had one inquiry for a HV supply that was pretty time-agile, which
would need a linear reg.

Frankly, I\'d rather not be in the HV business. Too much to go wrong.

This stepped C-W was just a goofy idea.

This topology uses isolation transformers with dual secondaries:

https://imgur.com/a/XRoYq2V

I _think_ I got the dots right...

I think that untangles into a 360 volt transformer and a half-wave
doubler.
Ya that sounds right. An old trick in the National Semi handbook from
the 70s I think it was, for regulation on the secondary is to wrap an
LM317 inside the grid to cathode voltage of a power triode and that
works OK for regulating up to a couple kV at low currents without too
much thought on how to provide an appropriate reference and error amp
for the potentials on that side.

Long lead times on many N fets with Vds > 1kV, not surprising I guess.
Lately we don\'t run line AC into boxes, or use line frequency
transformers. Too many safety and compliance isues, too much weight
and cost.
Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
readily available up to 100 watts or so

much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684

Phihomg and MeanWell make warts (big plugs) at 60 watts.


All you need is a power bar with the outlets in the right orientation.
The one over my bench is a very nice 20x Tripplite one, with filtering
and MOVs, but the prongs are oriented horizontally, so that most warts
take up two spaces.

Cheers

Phil Hobbs

We\'re shipping rackmount boxes to a big govt facility. They have a
group in charge of safety and compliance and all that stuff and would
have set us back 6 months and maybe $40K in lab fees if we ran AC into
the box. An external 24 volt 2.5-amp laptop-type supply just fixed the
problem... no complaints from the users.

Yeah, we use warts too. Our standard one is an SL Power ME10A2403B01,
which comes with international plug adapters. It\'s overkill for most of
our stuff, except for some of the beefier TE coolers.


https://www.dropbox.com/s/vjzhoths9v55gpq/Man_Front_1.jpg?raw=1

Very pretty.

Ugly. They insisted on black anodize. Highland Blue would have been
much better.

The LCD is an eval board. We couldn\'t get the lcd or the driver chips,
but lots of eval boards are available.
Click to expand...
We\'re going in the DKNY direction ourselves--machined brass and black
powder-coated steel.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
 
Gerhard Hoffmann wrote:
Am 29.07.22 um 14:09 schrieb Phil Hobbs:

We\'re going in the DKNY direction ourselves--machined brass and black
powder-coated steel.

Coating with black powder?

Cheers


  Gerhard


Note the hyphen. ;)
Click to expand...

However, we do thing they\'re the bomb.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
 
fredag den 29. juli 2022 kl. 04.21.36 UTC+2 skrev jla...@highlandsniptechnology.com:
On Thu, 28 Jul 2022 11:15:27 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

torsdag den 28. juli 2022 kl. 17.36.08 UTC+2 skrev jla...@highlandsniptechnology.com:
On Thu, 28 Jul 2022 10:46:12 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

jla...@highlandsniptechnology.com wrote:
On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:

On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

jla...@highlandsniptechnology.com wrote:

https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1

Fun. Of course with the right parts, you can do 2**N multiplication
with N stages. (Does require using the relays for commutation, of course.)

Cheers

Phil Hobbs
This circuit can do a 2^N step high-voltage supply with N low voltage,
cheap telecom relays. Maybe an incremental linear reg could
interpolate between the steps.

regulate the input?

Sure. The source could be something like an LTC3803 (geat part) and a
standard transformer, one of the DRQ things.

We had one inquiry for a HV supply that was pretty time-agile, which
would need a linear reg.

Frankly, I\'d rather not be in the HV business. Too much to go wrong.

This stepped C-W was just a goofy idea.

This topology uses isolation transformers with dual secondaries:

https://imgur.com/a/XRoYq2V

I _think_ I got the dots right...

I think that untangles into a 360 volt transformer and a half-wave
doubler.
Ya that sounds right. An old trick in the National Semi handbook from
the 70s I think it was, for regulation on the secondary is to wrap an
LM317 inside the grid to cathode voltage of a power triode and that
works OK for regulating up to a couple kV at low currents without too
much thought on how to provide an appropriate reference and error amp
for the potentials on that side.

Long lead times on many N fets with Vds > 1kV, not surprising I guess.
Lately we don\'t run line AC into boxes, or use line frequency
transformers. Too many safety and compliance isues, too much weight
and cost.
Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
readily available up to 100 watts or so

much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684

Phihomg and MeanWell make warts (big plugs) at 60 watts.


All you need is a power bar with the outlets in the right orientation.
The one over my bench is a very nice 20x Tripplite one, with filtering
and MOVs, but the prongs are oriented horizontally, so that most warts
take up two spaces.

Cheers

Phil Hobbs
We\'re shipping rackmount boxes to a big govt facility. They have a
group in charge of safety and compliance and all that stuff and would
have set us back 6 months and maybe $40K in lab fees if we ran AC into
the box. An external 24 volt 2.5-amp laptop-type supply just fixed the
problem... no complaints from the users.

https://www.dropbox.com/s/vjzhoths9v55gpq/Man_Front_1.jpg?raw=1

It pulls about 2 amps until the giant EOM oven heats up, maybe 15
minutes.

The power connector on the back is the usual barrel, but it\'s threaded
for optional mechanical locking.

the big Meanwell comes with an 8 pin minifit-jr or 4 pin XLR, both are locking
XLRs are great.
Click to expand...

ye as long as it is the Neutrik style, easy to assemble excellent strain relief,
nothing like the old Cannon/Switchcraft stuff with all sorts of tiny screws

I never understood why a microphone connector has,
like, 10 amp pins. What SPL makes 10 amps?
Click to expand...

it needs to be musician and roadie proof. It has also been used for connecting spekers

Now replaced with Speakon with is up to 8 pins, 40A rated, and the pins are inside where you can\'t touch them
 
On Fri, 29 Jul 2022 08:09:54 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Thu, 28 Jul 2022 11:46:01 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Thu, 28 Jul 2022 10:46:12 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Wed, 27 Jul 2022 23:35:12 -0700 (PDT), Lasse Langwadt Christensen
langwadt@fonz.dk> wrote:

torsdag den 28. juli 2022 kl. 02.54.38 UTC+2 skrev bitrex:
On 7/27/2022 5:08 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 21:53:08 -0400, bitrex <us...@example.net> wrote:

On 7/26/2022 10:19 AM, jla...@highlandsniptechnology.com wrote:
On Tue, 26 Jul 2022 07:03:38 -0700 (PDT), Lasse Langwadt Christensen
lang...@fonz.dk> wrote:

tirsdag den 26. juli 2022 kl. 15.59.31 UTC+2 skrev jla...@highlandsniptechnology.com:
On Tue, 26 Jul 2022 08:58:39 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

jla...@highlandsniptechnology.com wrote:

https://www.dropbox.com/s/wyd29ukhfm27rsj/Binary_CW_Multplier.jpg?raw=1

Fun. Of course with the right parts, you can do 2**N multiplication
with N stages. (Does require using the relays for commutation, of course.)

Cheers

Phil Hobbs
This circuit can do a 2^N step high-voltage supply with N low voltage,
cheap telecom relays. Maybe an incremental linear reg could
interpolate between the steps.

regulate the input?

Sure. The source could be something like an LTC3803 (geat part) and a
standard transformer, one of the DRQ things.

We had one inquiry for a HV supply that was pretty time-agile, which
would need a linear reg.

Frankly, I\'d rather not be in the HV business. Too much to go wrong.

This stepped C-W was just a goofy idea.

This topology uses isolation transformers with dual secondaries:

https://imgur.com/a/XRoYq2V

I _think_ I got the dots right...

I think that untangles into a 360 volt transformer and a half-wave
doubler.
Ya that sounds right. An old trick in the National Semi handbook from
the 70s I think it was, for regulation on the secondary is to wrap an
LM317 inside the grid to cathode voltage of a power triode and that
works OK for regulating up to a couple kV at low currents without too
much thought on how to provide an appropriate reference and error amp
for the potentials on that side.

Long lead times on many N fets with Vds > 1kV, not surprising I guess.
Lately we don\'t run line AC into boxes, or use line frequency
transformers. Too many safety and compliance isues, too much weight
and cost.
Yep. Laptop-style external bricks in 24-ish and 48 volts are pretty
readily available up to 100 watts or so

much more than that, e.g. https://www.digikey.dk/en/products/detail/mean-well-usa-inc/GST280A24-C6P/7703684

Phihomg and MeanWell make warts (big plugs) at 60 watts.


All you need is a power bar with the outlets in the right orientation.
The one over my bench is a very nice 20x Tripplite one, with filtering
and MOVs, but the prongs are oriented horizontally, so that most warts
take up two spaces.

Cheers

Phil Hobbs

We\'re shipping rackmount boxes to a big govt facility. They have a
group in charge of safety and compliance and all that stuff and would
have set us back 6 months and maybe $40K in lab fees if we ran AC into
the box. An external 24 volt 2.5-amp laptop-type supply just fixed the
problem... no complaints from the users.

Yeah, we use warts too. Our standard one is an SL Power ME10A2403B01,
which comes with international plug adapters. It\'s overkill for most of
our stuff, except for some of the beefier TE coolers.


https://www.dropbox.com/s/vjzhoths9v55gpq/Man_Front_1.jpg?raw=1

Very pretty.

Ugly. They insisted on black anodize. Highland Blue would have been
much better.

The LCD is an eval board. We couldn\'t get the lcd or the driver chips,
but lots of eval boards are available.

We\'re going in the DKNY direction ourselves--machined brass and black
powder-coated steel.

Cheers

Phil Hobbs
Click to expand...

Here\'s the first unit of a new product. The front panel is powder
coated on the front and all edges, but still conductive bare aluminum
on its back side.

Protocase made us 10 of these in something like 5 days. They do
beautiful work.

https://www.dropbox.com/sh/d908mumrhoglz1v/AACGXlgZ2edfG0rLsxbdMPWMa?dl=0
 
lang...@fonz.dk wrote:
====================
the big Meanwell comes with an 8 pin minifit-jr or 4 pin XLR, both are locking
XLRs are great.

ye as long as it is the Neutrik style, easy to assemble excellent strain relief,
Click to expand...

** Neutrik \"XLRs\" are fragile compared to Cannon types, the plastic screw up strain relief works loose and will break if trodden on.

> nothing like the old Cannon/Switchcraft stuff with all sorts of tiny screws

** The Switchraft head locking screw is captured and the whole plug is damn near unbreakable.
It was specially designed for use with microphones with a smooth, streamlined shape.

https://www.switchcraft.com/a-series-3-pin-xlr-female-cable-mount-silver-pins-nickel/a3f/

While Neutrik Speakons are fine, the many clones are not and fail to connect after a short period of use.
The similar \"PowerCons\" are flat out dangerous.


...... Phil
 
lørdag den 30. juli 2022 kl. 02.21.36 UTC+2 skrev palli...@gmail.com:
lang...@fonz.dk wrote:
===================
the big Meanwell comes with an 8 pin minifit-jr or 4 pin XLR, both are locking
XLRs are great.

ye as long as it is the Neutrik style, easy to assemble excellent strain relief,
** Neutrik \"XLRs\" are fragile compared to Cannon types, the plastic screw up strain relief works loose and will break if trodden on.
Click to expand...

I prefer the Neutrik and I haven\'t seen anyone use the Cannon style for 30 years

nothing like the old Cannon/Switchcraft stuff with all sorts of tiny screws
** The Switchraft head locking screw is captured and the whole plug is damn near unbreakable.
It was specially designed for use with microphones with a smooth, streamlined shape.
Click to expand...

I\'m taking about this nonsense https://en.wikipedia.org/wiki/XLR_connector#/media/File:Xlr-connectors.jpg
 
lang...@fonz.dk wrote:
====================
the big Meanwell comes with an 8 pin minifit-jr or 4 pin XLR, both are locking
XLRs are great.

ye as long as it is the Neutrik style, easy to assemble excellent strain relief,

** Neutrik \"XLRs\" are fragile compared to Cannon types, the plastic screw up strain relief works loose and will break if trodden on.

I prefer the Neutrik and I haven\'t seen anyone use the Cannon style for 30 years
Click to expand...

** Good for YOU - BTW, it proves nothing.


nothing like the old Cannon/Switchcraft stuff with all sorts of tiny screws

** The Switchraft head locking screw is captured and the whole plug is damn near unbreakable.

It was specially designed for use with microphones with a smooth, streamlined shape.

I\'m taking about this nonsense https://en.wikipedia.org/wiki/XLR_connector#/media/File:Xlr-connectors.jpg
Click to expand...

** Hate to be the one to tell ya this - but the are not made by \"Cannon\".
Merely cheap XLR style clones made in Asia.

FYI:

Originals had slot headed screws on the saddle and the name Cannon embossed on ( black or grey) inserts.
Not only outlast the mics they were bought for, but often enough the the owners too.




...... Phil
 
lørdag den 30. juli 2022 kl. 11.42.20 UTC+2 skrev palli...@gmail.com:
lang...@fonz.dk wrote:
====================


the big Meanwell comes with an 8 pin minifit-jr or 4 pin XLR, both are locking
XLRs are great.

ye as long as it is the Neutrik style, easy to assemble excellent strain relief,

** Neutrik \"XLRs\" are fragile compared to Cannon types, the plastic screw up strain relief works loose and will break if trodden on.

I prefer the Neutrik and I haven\'t seen anyone use the Cannon style for 30 years
** Good for YOU - BTW, it proves nothing.
nothing like the old Cannon/Switchcraft stuff with all sorts of tiny screws

** The Switchraft head locking screw is captured and the whole plug is damn near unbreakable.

It was specially designed for use with microphones with a smooth, streamlined shape.

I\'m taking about this nonsense https://en.wikipedia.org/wiki/XLR_connector#/media/File:Xlr-connectors.jpg

** Hate to be the one to tell ya this - but the are not made by \"Cannon\".
Merely cheap XLR style clones made in Asia.
Click to expand...

https://www.farnell.com/datasheets/723541.pdf
 
On Fri, 29 Jul 2022 17:21:33 -0700 (PDT), Phil Allison
<pallison49@gmail.com> wrote:

lang...@fonz.dk wrote:
====================

the big Meanwell comes with an 8 pin minifit-jr or 4 pin XLR, both are locking
XLRs are great.

ye as long as it is the Neutrik style, easy to assemble excellent strain relief,

** Neutrik \"XLRs\" are fragile compared to Cannon types, the plastic screw up strain relief works loose and will break if trodden on.

nothing like the old Cannon/Switchcraft stuff with all sorts of tiny screws

** The Switchraft head locking screw is captured and the whole plug is damn near unbreakable.
It was specially designed for use with microphones with a smooth, streamlined shape.

https://www.switchcraft.com/a-series-3-pin-xlr-female-cable-mount-silver-pins-nickel/a3f/
Click to expand...

In the late 1960s to early 1970s, I was a sound man and electrician in
various stage productions. All the XLRs I ever saw (and installed)
were made by Switchcraft, and these were just bulletproof.

They were what one used for low-impedance microphone cables.

I\'ve at least looked at the Neutrik XLRs, but I\'ve never used or
installed them.


While Neutrik Speakons are fine, the many clones are not and fail to connect after a short period of use.
The similar \"PowerCons\" are flat out dangerous.
Click to expand...

Dangerous in what sense? (I have no personal experience here.).

Joe Gwinn
 
Joe Gwinn wrote:
==============
** Neutrik \"XLRs\" are fragile compared to Cannon types, the plastic screw up strain relief works loose and will break if trodden on.

nothing like the old Cannon/Switchcraft stuff with all sorts of tiny screws

** The Switchraft head locking screw is captured and the whole plug is damn near unbreakable.
It was specially designed for use with microphones with a smooth, streamlined shape.

https://www.switchcraft.com/a-series-3-pin-xlr-female-cable-mount-silver-pins-nickel/a3f/


In the late 1960s to early 1970s, I was a sound man and electrician in
various stage productions. All the XLRs I ever saw (and installed)
were made by Switchcraft, and these were just bulletproof.
Click to expand...

** All the ones I saw back then were \" Cannon \" made here in Australia.
3 pin EXP and XLR types, plus a few LNEs for AC power.
Switchcraft were a rare sight or came packed with Shure SM xx mics.

While Neutrik Speakons are fine, the many clones are not and fail to connect after a short period of use.
The similar \"PowerCons\" are flat out dangerous.

Dangerous in what sense? (I have no personal experience here.).
Click to expand...

** They are NOT safety approved for use outside of a professional installation situation.
Three reasons exist:

1. Not safe for disconnection while under load - may arc and burn.
2. Will come apart when twisted anti-clockwise exposing live parts.
3. So similar to a Speakon connector folk try to use them with one, forcing it in making a lethal connection.

Should not be supplied to the public, but are seen on items that are sold to anyone - ie compact self powered speakers.


....... Phil
 
Phil Allison wrote:
=================

** Ooops.
** All the ones I saw back then were \" Cannon \" made here in Australia.
3 pin XLP and XLR types, plus a few LNEs for AC power.
Click to expand...

FYI XLRs differ by having resilient fittings on the plug to eliminate lateral movement when connected to a mic.

XLPs could move about somewhat and made clicking noises in the mic.


...... Phil
 
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