AoE x-Chapters - 1x.2 Resistors

[John Miles, KE5FX]

On Wednesday, August 7, 2019 at 6:11:19 AM UTC-7, Phil Hobbs wrote:
> Good luck at 2 GHz. Not every trimpot is used for DC offsets, by a lot.

What are some good trimpots for use at 2 GHz?

Seriously, I could use some of those for the variable-gain CFB amps I like
to keep around the bench.

-- john, KE5FX

 

[Jan Panteltje]

On a sunny day (Wed, 7 Aug 2019 13:53:51 -0400) it happened Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote in
<qif37i$qm4$1@dont-email.me>:

Photodiodes are generally pretty good, assuming you control the etalon
fringes. The responsivity of BPW34s varies only a few percent
unit-to-unit unless you're out in the tails of the response.

Diode lasers, now that's another issue. It's not uncommon for the
threshold current to vary +-40%, and the major damage mechanism is facet
overheating from too-high output power. The best way to handle that is
a constant-power feedback loop and a current limit set by a dpot.

If I needed to modulate it rapidly with some known AM depth and/or FM
deviation, I'd probably use a built-up R-2R attenuator and program it
with hot tweezers.


I made a personal deal with one laser supplier that they would alert
me to any major changes. Of course they didn't. I think they buy
their lots of pds and lasers in dark alleys in Shanghai.

Everybody seems to make their lasers in pots and pans, except for the
very highest-volume ones. I'm using a $700 Nichia 488-nm diode today,
which has a slow-axis beam divergence of 7 to 13 degrees, typical 10,
and an aiming tolerance of +-5 degrees! Maintaining a consistent
collimated beam diameter requires either a selection of different
collimating lenses or some sort of varifocal or zoom arrangement. Blech.



Their fiber connector housings must be made from melted-down beer
cans. An unmate/mate cycle is good for 3 dB gain change.

1 dB is more usual, at least with Kyocera ferrule inserts.

As my Dad used to say when I complained about some chore, "If it were
easy, I'd have done it myself."

Cheers

Phil Hobbs

Lasers are fun,
I got hold of an old Microvision Laser video projector (clone?),
basically a red, green and blue laser deflected by a MEMS mirror
giving a resolution of 848 x 480.
Connected its composite video input to a Raspberry Pi composite out
and made some movies special effects (play with omxplayer).
Somebody used a DLP projector to illuminate photo PCBs,
wonder if this thing can do that too.
It is not very bright, for safety reasons I think, DO NO LOOK IN BEAM
warnings all over it, but the nice thing is: it is always in focus.
So you can beam on the white curtains and the picture is still in focus
if the air moves those.

Principle:
http://www.bing.com/images/search?view=detailV2&ccid=lgEHCasX&id=852E23B953B80CD603596726673F74F87295AB3D&thid=OIP.lgEHCasXZSrvHd4TBnfmhQHaFu&mediaurl=https%3a%2f%2f4.bp.blogspot.com%2f-5juFYWh0hUI%2fV02QXTCwBCI%2fAAAAAAAABf8%2fy-jLrgFlesIrkj7WX48yWLaflFnx8ne_wCLcB%2fs1600%2fisl78365-mems_scanning_system_diagram-darkhud-2.jpg&exph=1237&expw=1600&q=microvision+laser+projector+internal&simid=608025273438700994&selectedIndex=4&ajaxhist=0

This one:
https://www.ebay.com/itm/232188476438

Test:
http://panteltje.com/pub/microvision_mars_attacks_IMG_0137.JPG

Any application ideas?

 

[Phil Hobbs]

On 8/7/19 11:18 AM, John Larkin wrote:

On Tue, 6 Aug 2019 22:25:28 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/6/19 9:38 PM, George Herold wrote:
On Monday, August 5, 2019 at 9:51:49 PM UTC-4, Phil Hobbs wrote:
On 8/5/19 9:19 PM, George Herold wrote:
On Monday, August 5, 2019 at 5:44:56 PM UTC-4, Winfield Hill wrote:
tabbypurr@gmail.com wrote...

A dry tome? If you don't want that you won't be
buying AoE It's a book of engineer's factual
info, not a junk soap.

Thanks, I think. Actually we're a little of each;
we get tired of the endless spreadsheets of parts
data, bench meas, writing dry-tome stuff, and Paul
breaks out in the Big Lebowski, or whatever.
Gotta jazz up the stories.

And we love name dropping. John sends us his huge
resistor fixture, we explode it, damn right we fess
up. Are we gonna post pictures, claim we made it?

OK, could ... Nah.


--
Thanks,
- Win

AoE has always had a relaxed folksy feel. Transistor man, for instance,
is in the first ed.
I'm happy that is not going away. :^)

George H.

Transistor man vs Ebers-Moll, mumble frotz. Ebers-Moll for me.
Grin, Ebers-Moll is cool now that I'm older, Transistor man
get's you going when you don't know as much.

I suppose, in a purely elementary treatment. But in a combination
textbook + professional reference, I think it's out of place. ('Tain't
my call, of course.)

If JL ever gets round to writing "Electronics From Scratch", he could
get away with something like TM just fine.

Cheers

Phil Hobbs

I never met Transistor Man. But I can (and do) explain transistors
pretty well in about a half hour at a whiteboard with just a few
concepts and a few numbers. Ebers-Moll is not the whole story at all.

That's true, of course. What I mainly dislike about TM is that he gives
the impression that a transistor works like a rheostat.

Last few instruments that I designed, I don't think I've used a single
bipolar transistor. They are going the way of tubes.

In your world, I expect they are. Not round here, by a lot.

I still like relays!

Me too. Best R_on * C_off ratio in the biz!

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

 

[Phil Hobbs]

On 8/7/19 3:14 PM, Jan Panteltje wrote:

On a sunny day (Wed, 7 Aug 2019 13:53:51 -0400) it happened Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote in
qif37i$qm4$1@dont-email.me>:

Photodiodes are generally pretty good, assuming you control the etalon
fringes. The responsivity of BPW34s varies only a few percent
unit-to-unit unless you're out in the tails of the response.

Diode lasers, now that's another issue. It's not uncommon for the
threshold current to vary +-40%, and the major damage mechanism is facet
overheating from too-high output power. The best way to handle that is
a constant-power feedback loop and a current limit set by a dpot.

If I needed to modulate it rapidly with some known AM depth and/or FM
deviation, I'd probably use a built-up R-2R attenuator and program it
with hot tweezers.


I made a personal deal with one laser supplier that they would alert
me to any major changes. Of course they didn't. I think they buy
their lots of pds and lasers in dark alleys in Shanghai.

Everybody seems to make their lasers in pots and pans, except for the
very highest-volume ones. I'm using a $700 Nichia 488-nm diode today,
which has a slow-axis beam divergence of 7 to 13 degrees, typical 10,
and an aiming tolerance of +-5 degrees! Maintaining a consistent
collimated beam diameter requires either a selection of different
collimating lenses or some sort of varifocal or zoom arrangement. Blech.



Their fiber connector housings must be made from melted-down beer
cans. An unmate/mate cycle is good for 3 dB gain change.

1 dB is more usual, at least with Kyocera ferrule inserts.

As my Dad used to say when I complained about some chore, "If it were
easy, I'd have done it myself."

Cheers

Phil Hobbs

Lasers are fun,
I got hold of an old Microvision Laser video projector (clone?),
basically a red, green and blue laser deflected by a MEMS mirror
giving a resolution of 848 x 480.
Connected its composite video input to a Raspberry Pi composite out
and made some movies special effects (play with omxplayer).
Somebody used a DLP projector to illuminate photo PCBs,
wonder if this thing can do that too.
It is not very bright, for safety reasons I think, DO NO LOOK IN BEAM
warnings all over it, but the nice thing is: it is always in focus.
So you can beam on the white curtains and the picture is still in focus
if the air moves those.

Principle:
http://www.bing.com/images/search?view=detailV2&ccid=lgEHCasX&id=852E23B953B80CD603596726673F74F87295AB3D&thid=OIP.lgEHCasXZSrvHd4TBnfmhQHaFu&mediaurl=https%3a%2f%2f4.bp.blogspot.com%2f-5juFYWh0hUI%2fV02QXTCwBCI%2fAAAAAAAABf8%2fy-jLrgFlesIrkj7WX48yWLaflFnx8ne_wCLcB%2fs1600%2fisl78365-mems_scanning_system_diagram-darkhud-2.jpg&exph=1237&expw=1600&q=microvision+laser+projector+internal&simid=608025273438700994&selectedIndex=4&ajaxhist=0

This one:
https://www.ebay.com/itm/232188476438

Test:
http://panteltje.com/pub/microvision_mars_attacks_IMG_0137.JPG

Any application ideas?

Sure, you can use picoprojectors for lots of stuff. I had a customer
who was going to use that principle for direct retinal projection in an
augmented-reality headset.

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

 

[John Larkin]

On Wed, 7 Aug 2019 17:25:19 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/7/19 11:18 AM, John Larkin wrote:
On Tue, 6 Aug 2019 22:25:28 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/6/19 9:38 PM, George Herold wrote:
On Monday, August 5, 2019 at 9:51:49 PM UTC-4, Phil Hobbs wrote:
On 8/5/19 9:19 PM, George Herold wrote:
On Monday, August 5, 2019 at 5:44:56 PM UTC-4, Winfield Hill wrote:
tabbypurr@gmail.com wrote...

A dry tome? If you don't want that you won't be
buying AoE It's a book of engineer's factual
info, not a junk soap.

Thanks, I think. Actually we're a little of each;
we get tired of the endless spreadsheets of parts
data, bench meas, writing dry-tome stuff, and Paul
breaks out in the Big Lebowski, or whatever.
Gotta jazz up the stories.

And we love name dropping. John sends us his huge
resistor fixture, we explode it, damn right we fess
up. Are we gonna post pictures, claim we made it?

OK, could ... Nah.


--
Thanks,
- Win

AoE has always had a relaxed folksy feel. Transistor man, for instance,
is in the first ed.
I'm happy that is not going away. :^)

George H.

Transistor man vs Ebers-Moll, mumble frotz. Ebers-Moll for me.
Grin, Ebers-Moll is cool now that I'm older, Transistor man
get's you going when you don't know as much.

I suppose, in a purely elementary treatment. But in a combination
textbook + professional reference, I think it's out of place. ('Tain't
my call, of course.)

If JL ever gets round to writing "Electronics From Scratch", he could
get away with something like TM just fine.

Cheers

Phil Hobbs

I never met Transistor Man. But I can (and do) explain transistors
pretty well in about a half hour at a whiteboard with just a few
concepts and a few numbers. Ebers-Moll is not the whole story at all.

That's true, of course. What I mainly dislike about TM is that he gives
the impression that a transistor works like a rheostat.


Last few instruments that I designed, I don't think I've used a single
bipolar transistor. They are going the way of tubes.

In your world, I expect they are. Not round here, by a lot.

My analog mosfet realtime Tj simulator/shutdown uses a dual PNP as a
multiplier to compute power, Is*Vds. I need bipolars for that.

I might do another fast photodiode cascode, so I'll need a small fast
NPN, if anybody still makes them next week. Digikey still shows BFT25
as active.

 

[John Larkin]

On Wed, 7 Aug 2019 20:59:41 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/7/19 6:27 PM, John Larkin wrote:
On Wed, 7 Aug 2019 17:25:19 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/7/19 11:18 AM, John Larkin wrote:
On Tue, 6 Aug 2019 22:25:28 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/6/19 9:38 PM, George Herold wrote:
On Monday, August 5, 2019 at 9:51:49 PM UTC-4, Phil Hobbs wrote:
On 8/5/19 9:19 PM, George Herold wrote:
On Monday, August 5, 2019 at 5:44:56 PM UTC-4, Winfield Hill wrote:
tabbypurr@gmail.com wrote...

A dry tome? If you don't want that you won't be
buying AoE It's a book of engineer's factual
info, not a junk soap.

Thanks, I think. Actually we're a little of each;
we get tired of the endless spreadsheets of parts
data, bench meas, writing dry-tome stuff, and Paul
breaks out in the Big Lebowski, or whatever.
Gotta jazz up the stories.

And we love name dropping. John sends us his huge
resistor fixture, we explode it, damn right we fess
up. Are we gonna post pictures, claim we made it?

OK, could ... Nah.


--
Thanks,
- Win

AoE has always had a relaxed folksy feel. Transistor man, for instance,
is in the first ed.
I'm happy that is not going away. :^)

George H.

Transistor man vs Ebers-Moll, mumble frotz. Ebers-Moll for me.
Grin, Ebers-Moll is cool now that I'm older, Transistor man
get's you going when you don't know as much.

I suppose, in a purely elementary treatment. But in a combination
textbook + professional reference, I think it's out of place. ('Tain't
my call, of course.)

If JL ever gets round to writing "Electronics From Scratch", he could
get away with something like TM just fine.

Cheers

Phil Hobbs

I never met Transistor Man. But I can (and do) explain transistors
pretty well in about a half hour at a whiteboard with just a few
concepts and a few numbers. Ebers-Moll is not the whole story at all.

That's true, of course. What I mainly dislike about TM is that he gives
the impression that a transistor works like a rheostat.


Last few instruments that I designed, I don't think I've used a single
bipolar transistor. They are going the way of tubes.

In your world, I expect they are. Not round here, by a lot.

My analog mosfet realtime Tj simulator/shutdown uses a dual PNP as a
multiplier to compute power, Is*Vds. I need bipolars for that.

I might do another fast photodiode cascode, so I'll need a small fast
NPN, if anybody still makes them next week. Digikey still shows BFT25
as active.


Aren't you just the bundle of joy today.

Cheers

Phil Hobbs

I have legitimate grievances. I am discovering that JTAG is even less
standardized than USB.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

[Phil Hobbs]

On 8/7/19 6:27 PM, John Larkin wrote:

On Wed, 7 Aug 2019 17:25:19 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/7/19 11:18 AM, John Larkin wrote:
On Tue, 6 Aug 2019 22:25:28 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/6/19 9:38 PM, George Herold wrote:
On Monday, August 5, 2019 at 9:51:49 PM UTC-4, Phil Hobbs wrote:
On 8/5/19 9:19 PM, George Herold wrote:
On Monday, August 5, 2019 at 5:44:56 PM UTC-4, Winfield Hill wrote:
tabbypurr@gmail.com wrote...

A dry tome? If you don't want that you won't be
buying AoE It's a book of engineer's factual
info, not a junk soap.

Thanks, I think. Actually we're a little of each;
we get tired of the endless spreadsheets of parts
data, bench meas, writing dry-tome stuff, and Paul
breaks out in the Big Lebowski, or whatever.
Gotta jazz up the stories.

And we love name dropping. John sends us his huge
resistor fixture, we explode it, damn right we fess
up. Are we gonna post pictures, claim we made it?

OK, could ... Nah.


--
Thanks,
- Win

AoE has always had a relaxed folksy feel. Transistor man, for instance,
is in the first ed.
I'm happy that is not going away. :^)

George H.

Transistor man vs Ebers-Moll, mumble frotz. Ebers-Moll for me.
Grin, Ebers-Moll is cool now that I'm older, Transistor man
get's you going when you don't know as much.

I suppose, in a purely elementary treatment. But in a combination
textbook + professional reference, I think it's out of place. ('Tain't
my call, of course.)

If JL ever gets round to writing "Electronics From Scratch", he could
get away with something like TM just fine.

Cheers

Phil Hobbs

I never met Transistor Man. But I can (and do) explain transistors
pretty well in about a half hour at a whiteboard with just a few
concepts and a few numbers. Ebers-Moll is not the whole story at all.

That's true, of course. What I mainly dislike about TM is that he gives
the impression that a transistor works like a rheostat.


Last few instruments that I designed, I don't think I've used a single
bipolar transistor. They are going the way of tubes.

In your world, I expect they are. Not round here, by a lot.

My analog mosfet realtime Tj simulator/shutdown uses a dual PNP as a
multiplier to compute power, Is*Vds. I need bipolars for that.

I might do another fast photodiode cascode, so I'll need a small fast
NPN, if anybody still makes them next week. Digikey still shows BFT25
as active.

Aren't you just the bundle of joy today.

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

 

[Jan Panteltje]

On a sunny day (Wed, 7 Aug 2019 17:22:08 -0400) it happened Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote in
<qiffdv$1bie$1@gioia.aioe.org>:

On 8/7/19 3:14 PM, Jan Panteltje wrote:
Lasers are fun,
I got hold of an old Microvision Laser video projector (clone?),
basically a red, green and blue laser deflected by a MEMS mirror
giving a resolution of 848 x 480.
Connected its composite video input to a Raspberry Pi composite out
and made some movies special effects (play with omxplayer).
Somebody used a DLP projector to illuminate photo PCBs,
wonder if this thing can do that too.
It is not very bright, for safety reasons I think, DO NO LOOK IN BEAM
warnings all over it, but the nice thing is: it is always in focus.
So you can beam on the white curtains and the picture is still in focus
if the air moves those.

Principle:

http://www.bing.com/images/search?view=detailV2&ccid=lgEHCasX&id=852E23B953B80CD603596726673F74F87295AB3D&thid=OIP.lgEHCasXZSrvHd4TBnfmhQHaFu&mediaurl=https%3a%2f%2f4.bp.blogspot.com%2f-5juFYWh0hUI%2fV02QXTCwBCI%2fAAAAAAAABf8%2fy-jLrgFlesIrkj7WX48yWLafl
Fnx8ne_wCLcB%2fs1600%2fisl78365-mems_scanning_system_diagram-darkhud-2.jpg&exph=1237&expw=1600&q=microvision+laser+projector+int
ernal&simid=608025273438700994&selectedIndex=4&ajaxhist=0

This one:
https://www.ebay.com/itm/232188476438

Test:
http://panteltje.com/pub/microvision_mars_attacks_IMG_0137.JPG

Any application ideas?


Sure, you can use picoprojectors for lots of stuff. I had a customer
who was going to use that principle for direct retinal projection in an
augmented-reality headset.

OK, now that one I am not into trying with this.
I was thinking making a big one and projecting on the clouds F35 flying in,
the other side would think the stealth was working and fire all their missiles.
Wait a while and fly the real fighters in ...

I have a 50W laser diode (blue) and wonder what sort of MEMS mirror....
anyways,,,
Xperimenting is always fun.

You could perhaps also use a fast photo diode and get the reflected light
shine a white screen, look around corners with the right algo, that is experiment 1 I think.
Nothing much changed since 'flying spot film scanner',
those used a green short persistence CRT and 3 photo multipliers,
huge one for red, as not much red in green... and pneumatic fast pulldown between frames
we had many of those, very noisy.

Toys..


Greetings
D. Vader

 

[Jan Panteltje]

On a sunny day (Wed, 07 Aug 2019 15:27:41 -0700) it happened John Larkin
<jlarkin@highlandSNIPMEtechnology.com> wrote in
<jgjmkedja5g87i8v0m1ev61mf2mviu4ad7@4ax.com>:

My analog mosfet realtime Tj simulator/shutdown uses a dual PNP as a
multiplier to compute power, Is*Vds. I need bipolars for that.

I might do another fast photodiode cascode, so I'll need a small fast
NPN, if anybody still makes them next week. Digikey still shows BFT25
as active.

All LNBs[1] I know use extremely fast extremely low noise NPNs.

Mostly low voltage NPNs,
for example google
Infineon-BFP520-DS-v02_00-EN.pdf

45 GHz 1.2 dB noise

There are many and will likely still be there once California is part of China.
(as it always was^H^H^H^H^H^H^H^H^H^H^H^H^H^H)
I have a bunch of similar ones that I cannot remember the type number from..
Cheap too.

1[] those little satellite low noise down converter blocks, 10GHz to 2 GHz or there about.
You can buy those for 2$50 a piece on ebay including everything and the transistors.

 

[Jan Panteltje]

On a sunny day (Thu, 08 Aug 2019 07:02:11 -0700) it happened John Larkin
<jjlarkin@highlandtechnology.com> wrote in
<dgaoketaocgt6kb8qhgn7uuk8k2gka7eri@4ax.com>:

On Thu, 08 Aug 2019 06:34:06 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Wed, 07 Aug 2019 15:27:41 -0700) it happened John Larkin
jlarkin@highlandSNIPMEtechnology.com> wrote in
jgjmkedja5g87i8v0m1ev61mf2mviu4ad7@4ax.com>:

My analog mosfet realtime Tj simulator/shutdown uses a dual PNP as a
multiplier to compute power, Is*Vds. I need bipolars for that.

I might do another fast photodiode cascode, so I'll need a small fast
NPN, if anybody still makes them next week. Digikey still shows BFT25
as active.

All LNBs[1] I know use extremely fast extremely low noise NPNs.

Mostly low voltage NPNs,
for example google
Infineon-BFP520-DS-v02_00-EN.pdf

45 GHz 1.2 dB noise

There are many and will likely still be there once California is part of China.
(as it always was^H^H^H^H^H^H^H^H^H^H^H^H^H^H)

Good book, The Ghosts of Gold Mountain, about the Chinese who built
the Central Pacific Railroad through the Sierras. Lots of cool stuff
about Colfax, Dutch Flat, Truckee, and the China Wall.

https://www.dropbox.com/s/xw87qpchoqr6dxi/CW_sign.jpg?raw=1

Nice plate.


>Take a hike through Tunnel 6 if you are ever passing through.

OK,
Maybe this is of use to you regarding those low noise RF transistors, nice layouts
https://www.infineon.com/cms/en/search.html#!term=AN_1808&view=all
Design guide for RF transistors and diode in low noise block
link numer 4 from the top.

 

[John Larkin]

On Thu, 08 Aug 2019 06:34:06 GMT, Jan Panteltje
<pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Wed, 07 Aug 2019 15:27:41 -0700) it happened John Larkin
jlarkin@highlandSNIPMEtechnology.com> wrote in
jgjmkedja5g87i8v0m1ev61mf2mviu4ad7@4ax.com>:

My analog mosfet realtime Tj simulator/shutdown uses a dual PNP as a
multiplier to compute power, Is*Vds. I need bipolars for that.

I might do another fast photodiode cascode, so I'll need a small fast
NPN, if anybody still makes them next week. Digikey still shows BFT25
as active.

All LNBs[1] I know use extremely fast extremely low noise NPNs.

Mostly low voltage NPNs,
for example google
Infineon-BFP520-DS-v02_00-EN.pdf

45 GHz 1.2 dB noise

There are many and will likely still be there once California is part of China.
(as it always was^H^H^H^H^H^H^H^H^H^H^H^H^H^H)

Good book, The Ghosts of Gold Mountain, about the Chinese who built
the Central Pacific Railroad through the Sierras. Lots of cool stuff
about Colfax, Dutch Flat, Truckee, and the China Wall.

https://www.dropbox.com/s/xw87qpchoqr6dxi/CW_sign.jpg?raw=1

Take a hike through Tunnel 6 if you are ever passing through.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

[John Larkin]

On Thu, 08 Aug 2019 14:29:02 GMT, Jan Panteltje
<pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Thu, 08 Aug 2019 07:02:11 -0700) it happened John Larkin
jjlarkin@highlandtechnology.com> wrote in
dgaoketaocgt6kb8qhgn7uuk8k2gka7eri@4ax.com>:

On Thu, 08 Aug 2019 06:34:06 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Wed, 07 Aug 2019 15:27:41 -0700) it happened John Larkin
jlarkin@highlandSNIPMEtechnology.com> wrote in
jgjmkedja5g87i8v0m1ev61mf2mviu4ad7@4ax.com>:

My analog mosfet realtime Tj simulator/shutdown uses a dual PNP as a
multiplier to compute power, Is*Vds. I need bipolars for that.

I might do another fast photodiode cascode, so I'll need a small fast
NPN, if anybody still makes them next week. Digikey still shows BFT25
as active.

All LNBs[1] I know use extremely fast extremely low noise NPNs.

Mostly low voltage NPNs,
for example google
Infineon-BFP520-DS-v02_00-EN.pdf

45 GHz 1.2 dB noise

There are many and will likely still be there once California is part of China.
(as it always was^H^H^H^H^H^H^H^H^H^H^H^H^H^H)

Good book, The Ghosts of Gold Mountain, about the Chinese who built
the Central Pacific Railroad through the Sierras. Lots of cool stuff
about Colfax, Dutch Flat, Truckee, and the China Wall.

https://www.dropbox.com/s/xw87qpchoqr6dxi/CW_sign.jpg?raw=1

Nice plate.

E Clampus Vitus is either the California Historical Drinking Society
or the California Drinking Historical Society. They can't make up
their mind. Google it.

Here's the China Wall:

https://www.dropbox.com/s/72kz9sfg0bhbpmj/CW_wall.jpg?raw=1

I like this one:

https://www.dropbox.com/s/lynfoumh8256ijl/Tunnel_6.jpg?raw=1

It looks kind of like a cathedral.

Take a hike through Tunnel 6 if you are ever passing through.

OK,
Maybe this is of use to you regarding those low noise RF transistors, nice layouts
https://www.infineon.com/cms/en/search.html#!term=AN_1808&view=all
Design guide for RF transistors and diode in low noise block
link numer 4 from the top.

Interesting, thanks. I don't much do sine waves, but the parts and
concepts can apply to time domain.

I guess people will need RF NPNs for a while. Not so much PNPs.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

[Lasse Langwadt Christense]

torsdag den 8. august 2019 kl. 03.23.25 UTC+2 skrev John Larkin:

On Wed, 7 Aug 2019 20:59:41 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/7/19 6:27 PM, John Larkin wrote:
On Wed, 7 Aug 2019 17:25:19 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/7/19 11:18 AM, John Larkin wrote:
On Tue, 6 Aug 2019 22:25:28 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/6/19 9:38 PM, George Herold wrote:
On Monday, August 5, 2019 at 9:51:49 PM UTC-4, Phil Hobbs wrote:
On 8/5/19 9:19 PM, George Herold wrote:
On Monday, August 5, 2019 at 5:44:56 PM UTC-4, Winfield Hill wrote:
tabbypurr@gmail.com wrote...

A dry tome? If you don't want that you won't be
buying AoE It's a book of engineer's factual
info, not a junk soap.

Thanks, I think. Actually we're a little of each;
we get tired of the endless spreadsheets of parts
data, bench meas, writing dry-tome stuff, and Paul
breaks out in the Big Lebowski, or whatever.
Gotta jazz up the stories.

And we love name dropping. John sends us his huge
resistor fixture, we explode it, damn right we fess
up. Are we gonna post pictures, claim we made it?

OK, could ... Nah.


--
Thanks,
- Win

AoE has always had a relaxed folksy feel. Transistor man, for instance,
is in the first ed.
I'm happy that is not going away. :^)

George H.

Transistor man vs Ebers-Moll, mumble frotz. Ebers-Moll for me.
Grin, Ebers-Moll is cool now that I'm older, Transistor man
get's you going when you don't know as much.

I suppose, in a purely elementary treatment. But in a combination
textbook + professional reference, I think it's out of place. ('Tain't
my call, of course.)

If JL ever gets round to writing "Electronics From Scratch", he could
get away with something like TM just fine.

Cheers

Phil Hobbs

I never met Transistor Man. But I can (and do) explain transistors
pretty well in about a half hour at a whiteboard with just a few
concepts and a few numbers. Ebers-Moll is not the whole story at all.

That's true, of course. What I mainly dislike about TM is that he gives
the impression that a transistor works like a rheostat.


Last few instruments that I designed, I don't think I've used a single
bipolar transistor. They are going the way of tubes.

In your world, I expect they are. Not round here, by a lot.

My analog mosfet realtime Tj simulator/shutdown uses a dual PNP as a
multiplier to compute power, Is*Vds. I need bipolars for that.

I might do another fast photodiode cascode, so I'll need a small fast
NPN, if anybody still makes them next week. Digikey still shows BFT25
as active.


Aren't you just the bundle of joy today.

Cheers

Phil Hobbs

I have legitimate grievances. I am discovering that JTAG is even less
standardized than USB.

JTAG is just as much a standard as spi

 

On Thu, 8 Aug 2019 08:38:37 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

torsdag den 8. august 2019 kl. 03.23.25 UTC+2 skrev John Larkin:
On Wed, 7 Aug 2019 20:59:41 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/7/19 6:27 PM, John Larkin wrote:
On Wed, 7 Aug 2019 17:25:19 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/7/19 11:18 AM, John Larkin wrote:
On Tue, 6 Aug 2019 22:25:28 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/6/19 9:38 PM, George Herold wrote:
On Monday, August 5, 2019 at 9:51:49 PM UTC-4, Phil Hobbs wrote:
On 8/5/19 9:19 PM, George Herold wrote:
On Monday, August 5, 2019 at 5:44:56 PM UTC-4, Winfield Hill wrote:
tabbypurr@gmail.com wrote...

A dry tome? If you don't want that you won't be
buying AoE It's a book of engineer's factual
info, not a junk soap.

Thanks, I think. Actually we're a little of each;
we get tired of the endless spreadsheets of parts
data, bench meas, writing dry-tome stuff, and Paul
breaks out in the Big Lebowski, or whatever.
Gotta jazz up the stories.

And we love name dropping. John sends us his huge
resistor fixture, we explode it, damn right we fess
up. Are we gonna post pictures, claim we made it?

OK, could ... Nah.


--
Thanks,
- Win

AoE has always had a relaxed folksy feel. Transistor man, for instance,
is in the first ed.
I'm happy that is not going away. :^)

George H.

Transistor man vs Ebers-Moll, mumble frotz. Ebers-Moll for me.
Grin, Ebers-Moll is cool now that I'm older, Transistor man
get's you going when you don't know as much.

I suppose, in a purely elementary treatment. But in a combination
textbook + professional reference, I think it's out of place. ('Tain't
my call, of course.)

If JL ever gets round to writing "Electronics From Scratch", he could
get away with something like TM just fine.

Cheers

Phil Hobbs

I never met Transistor Man. But I can (and do) explain transistors
pretty well in about a half hour at a whiteboard with just a few
concepts and a few numbers. Ebers-Moll is not the whole story at all.

That's true, of course. What I mainly dislike about TM is that he gives
the impression that a transistor works like a rheostat.


Last few instruments that I designed, I don't think I've used a single
bipolar transistor. They are going the way of tubes.

In your world, I expect they are. Not round here, by a lot.

My analog mosfet realtime Tj simulator/shutdown uses a dual PNP as a
multiplier to compute power, Is*Vds. I need bipolars for that.

I might do another fast photodiode cascode, so I'll need a small fast
NPN, if anybody still makes them next week. Digikey still shows BFT25
as active.


Aren't you just the bundle of joy today.

Cheers

Phil Hobbs

I have legitimate grievances. I am discovering that JTAG is even less
standardized than USB.

JTAG is just as much a standard as spi

Which isn't saying much.

 

[Lasse Langwadt Christense]

fredag den 9. august 2019 kl. 03.59.46 UTC+2 skrev k...@notreal.com:

On Thu, 8 Aug 2019 08:38:37 -0700 (PDT), Lasse Langwadt Christensen
langwadt@fonz.dk> wrote:

torsdag den 8. august 2019 kl. 03.23.25 UTC+2 skrev John Larkin:
On Wed, 7 Aug 2019 20:59:41 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/7/19 6:27 PM, John Larkin wrote:
On Wed, 7 Aug 2019 17:25:19 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/7/19 11:18 AM, John Larkin wrote:
On Tue, 6 Aug 2019 22:25:28 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/6/19 9:38 PM, George Herold wrote:
On Monday, August 5, 2019 at 9:51:49 PM UTC-4, Phil Hobbs wrote:
On 8/5/19 9:19 PM, George Herold wrote:
On Monday, August 5, 2019 at 5:44:56 PM UTC-4, Winfield Hill wrote:
tabbypurr@gmail.com wrote...

A dry tome? If you don't want that you won't be
buying AoE It's a book of engineer's factual
info, not a junk soap.

Thanks, I think. Actually we're a little of each;
we get tired of the endless spreadsheets of parts
data, bench meas, writing dry-tome stuff, and Paul
breaks out in the Big Lebowski, or whatever.
Gotta jazz up the stories.

And we love name dropping. John sends us his huge
resistor fixture, we explode it, damn right we fess
up. Are we gonna post pictures, claim we made it?

OK, could ... Nah.


--
Thanks,
- Win

AoE has always had a relaxed folksy feel. Transistor man, for instance,
is in the first ed.
I'm happy that is not going away. :^)

George H.

Transistor man vs Ebers-Moll, mumble frotz. Ebers-Moll for me.
Grin, Ebers-Moll is cool now that I'm older, Transistor man
get's you going when you don't know as much.

I suppose, in a purely elementary treatment. But in a combination
textbook + professional reference, I think it's out of place. ('Tain't
my call, of course.)

If JL ever gets round to writing "Electronics From Scratch", he could
get away with something like TM just fine.

Cheers

Phil Hobbs

I never met Transistor Man. But I can (and do) explain transistors
pretty well in about a half hour at a whiteboard with just a few
concepts and a few numbers. Ebers-Moll is not the whole story at all.

That's true, of course. What I mainly dislike about TM is that he gives
the impression that a transistor works like a rheostat.


Last few instruments that I designed, I don't think I've used a single
bipolar transistor. They are going the way of tubes.

In your world, I expect they are. Not round here, by a lot.

My analog mosfet realtime Tj simulator/shutdown uses a dual PNP as a
multiplier to compute power, Is*Vds. I need bipolars for that.

I might do another fast photodiode cascode, so I'll need a small fast
NPN, if anybody still makes them next week. Digikey still shows BFT25
as active.


Aren't you just the bundle of joy today.

Cheers

Phil Hobbs

I have legitimate grievances. I am discovering that JTAG is even less
standardized than USB.

JTAG is just as much a standard as spi

Which isn't saying much.

exactly, but USB is very much a standard

 

[John Larkin]

On Thu, 8 Aug 2019 19:02:12 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

fredag den 9. august 2019 kl. 03.59.46 UTC+2 skrev k...@notreal.com:
On Thu, 8 Aug 2019 08:38:37 -0700 (PDT), Lasse Langwadt Christensen
langwadt@fonz.dk> wrote:

torsdag den 8. august 2019 kl. 03.23.25 UTC+2 skrev John Larkin:
On Wed, 7 Aug 2019 20:59:41 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/7/19 6:27 PM, John Larkin wrote:
On Wed, 7 Aug 2019 17:25:19 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/7/19 11:18 AM, John Larkin wrote:
On Tue, 6 Aug 2019 22:25:28 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/6/19 9:38 PM, George Herold wrote:
On Monday, August 5, 2019 at 9:51:49 PM UTC-4, Phil Hobbs wrote:
On 8/5/19 9:19 PM, George Herold wrote:
On Monday, August 5, 2019 at 5:44:56 PM UTC-4, Winfield Hill wrote:
tabbypurr@gmail.com wrote...

A dry tome? If you don't want that you won't be
buying AoE It's a book of engineer's factual
info, not a junk soap.

Thanks, I think. Actually we're a little of each;
we get tired of the endless spreadsheets of parts
data, bench meas, writing dry-tome stuff, and Paul
breaks out in the Big Lebowski, or whatever.
Gotta jazz up the stories.

And we love name dropping. John sends us his huge
resistor fixture, we explode it, damn right we fess
up. Are we gonna post pictures, claim we made it?

OK, could ... Nah.


--
Thanks,
- Win

AoE has always had a relaxed folksy feel. Transistor man, for instance,
is in the first ed.
I'm happy that is not going away. :^)

George H.

Transistor man vs Ebers-Moll, mumble frotz. Ebers-Moll for me.
Grin, Ebers-Moll is cool now that I'm older, Transistor man
get's you going when you don't know as much.

I suppose, in a purely elementary treatment. But in a combination
textbook + professional reference, I think it's out of place. ('Tain't
my call, of course.)

If JL ever gets round to writing "Electronics From Scratch", he could
get away with something like TM just fine.

Cheers

Phil Hobbs

I never met Transistor Man. But I can (and do) explain transistors
pretty well in about a half hour at a whiteboard with just a few
concepts and a few numbers. Ebers-Moll is not the whole story at all.

That's true, of course. What I mainly dislike about TM is that he gives
the impression that a transistor works like a rheostat.


Last few instruments that I designed, I don't think I've used a single
bipolar transistor. They are going the way of tubes.

In your world, I expect they are. Not round here, by a lot.

My analog mosfet realtime Tj simulator/shutdown uses a dual PNP as a
multiplier to compute power, Is*Vds. I need bipolars for that.

I might do another fast photodiode cascode, so I'll need a small fast
NPN, if anybody still makes them next week. Digikey still shows BFT25
as active.


Aren't you just the bundle of joy today.

Cheers

Phil Hobbs

I have legitimate grievances. I am discovering that JTAG is even less
standardized than USB.

JTAG is just as much a standard as spi

Which isn't saying much.

exactly, but USB is very much a standard

How many different connectors are there? At least 7.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

On Thu, 08 Aug 2019 19:55:06 -0700, John Larkin
<jjlarkin@highlandtechnology.com> wrote:

On Thu, 8 Aug 2019 19:02:12 -0700 (PDT), Lasse Langwadt Christensen
langwadt@fonz.dk> wrote:

fredag den 9. august 2019 kl. 03.59.46 UTC+2 skrev k...@notreal.com:
On Thu, 8 Aug 2019 08:38:37 -0700 (PDT), Lasse Langwadt Christensen
langwadt@fonz.dk> wrote:

torsdag den 8. august 2019 kl. 03.23.25 UTC+2 skrev John Larkin:
On Wed, 7 Aug 2019 20:59:41 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/7/19 6:27 PM, John Larkin wrote:
On Wed, 7 Aug 2019 17:25:19 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/7/19 11:18 AM, John Larkin wrote:
On Tue, 6 Aug 2019 22:25:28 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 8/6/19 9:38 PM, George Herold wrote:
On Monday, August 5, 2019 at 9:51:49 PM UTC-4, Phil Hobbs wrote:
On 8/5/19 9:19 PM, George Herold wrote:
On Monday, August 5, 2019 at 5:44:56 PM UTC-4, Winfield Hill wrote:
tabbypurr@gmail.com wrote...

A dry tome? If you don't want that you won't be
buying AoE It's a book of engineer's factual
info, not a junk soap.

Thanks, I think. Actually we're a little of each;
we get tired of the endless spreadsheets of parts
data, bench meas, writing dry-tome stuff, and Paul
breaks out in the Big Lebowski, or whatever.
Gotta jazz up the stories.

And we love name dropping. John sends us his huge
resistor fixture, we explode it, damn right we fess
up. Are we gonna post pictures, claim we made it?

OK, could ... Nah.


--
Thanks,
- Win

AoE has always had a relaxed folksy feel. Transistor man, for instance,
is in the first ed.
I'm happy that is not going away. :^)

George H.

Transistor man vs Ebers-Moll, mumble frotz. Ebers-Moll for me.
Grin, Ebers-Moll is cool now that I'm older, Transistor man
get's you going when you don't know as much.

I suppose, in a purely elementary treatment. But in a combination
textbook + professional reference, I think it's out of place. ('Tain't
my call, of course.)

If JL ever gets round to writing "Electronics From Scratch", he could
get away with something like TM just fine.

Cheers

Phil Hobbs

I never met Transistor Man. But I can (and do) explain transistors
pretty well in about a half hour at a whiteboard with just a few
concepts and a few numbers. Ebers-Moll is not the whole story at all.

That's true, of course. What I mainly dislike about TM is that he gives
the impression that a transistor works like a rheostat.


Last few instruments that I designed, I don't think I've used a single
bipolar transistor. They are going the way of tubes.

In your world, I expect they are. Not round here, by a lot.

My analog mosfet realtime Tj simulator/shutdown uses a dual PNP as a
multiplier to compute power, Is*Vds. I need bipolars for that.

I might do another fast photodiode cascode, so I'll need a small fast
NPN, if anybody still makes them next week. Digikey still shows BFT25
as active.


Aren't you just the bundle of joy today.

Cheers

Phil Hobbs

I have legitimate grievances. I am discovering that JTAG is even less
standardized than USB.

JTAG is just as much a standard as spi

Which isn't saying much.

exactly, but USB is very much a standard

How many different connectors are there? At least 7.

That's the nice thing about standards. There're _so_ many to choose
from.

 

[Winfield Hill]

Phil Hobbs wrote...

On 8/7/19 11:18 AM, John Larkin wrote:

Last few instruments that I designed, I don't
think I've used a single bipolar transistor.
They are going the way of tubes.

In your world, I expect they are. Not round here,
by a lot.

The same could be said for JFETs. Yes, we're
still using them, but actually, not by a lot,
not very many. A few here and there, but not
enough to keep the interest of many fab houses,
who are steadily discontinuing one type after
another.

Same problem for many small low-current MOSFET
types, which I like for their low capacitance.
And of course, we have all the 500MHz to 10GHz
RF transistors that have disappeared as their
functionality is now incorporated into ICs.


--
Thanks,
- Win

 

[Jasen Betts]

On 2019-08-09, John Larkin <jjlarkin@highlandtechnology.com> wrote:

On Thu, 8 Aug 2019 19:02:12 -0700 (PDT), Lasse Langwadt Christensen
langwadt@fonz.dk> wrote:

fredag den 9. august 2019 kl. 03.59.46 UTC+2 skrev k...@notreal.com:
On Thu, 8 Aug 2019 08:38:37 -0700 (PDT), Lasse Langwadt Christensen
langwadt@fonz.dk> wrote:


JTAG is just as much a standard as spi

Which isn't saying much.

exactly, but USB is very much a standard

How many different connectors are there? At least 7.

For usb I count 20

sockets

full size A,B, superspeed A, superspeed B
Mini A, B, A/B
Micro A, B, A/B
C

plugs

full size A,B, superspeed A, superspeed B
Mini A, B
Micro A, B
C

socket type A/B accepts both A and B plugs and is used for OTG

There's also an ESATA socket that also accepts USB-A plugs and
also USB signals on Expresscard sockets. and two types of pin
headers that connect via cable to "A" sockets on the chassis
(regular and superspeed)

--
When I tried casting out nines I made a hash of it.

 

[Clifford Heath]

On 8/8/19 4:34 pm, Jan Panteltje wrote:

I know use extremely fast extremely low noise NPNs.

Mostly low voltage NPNs,
for example google
Infineon-BFP520-DS-v02_00-EN.pdf

45 GHz 1.2 dB noise

What's with the Abs Max ratings V(CEO) and V(CES) on that datasheet?
Is the Abs Max collector-emmitter voltage 2.4V or 10V?

Does that "O" mean Operating and the "S" mean Smoke?

Clifford Heath.