precision low cost isolation amplifier

J

John Larkin

Guest
https://www.mouser.com/ProductDetail/Texas-Instruments/ISO120SG?qs=sGAEpiMZZMtyhvbnOfCRF6Da9Qaki2LfCgmz7yeO868%3D


--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
 
John Larkin wrote...
https://www.mouser.com/ProductDetail/Texas-Instruments/ISO120SG?qs=sGAEpiMZZMtyhvbnOfCRF6Da9Qaki2LfCgmz7yeO868%3D
Click to expand...

Been going since 1988. The design finally
gets some rest, after more than 40 years.


--
Thanks,
- Win
 
On 7 Jun 2019 14:46:48 -0700, Winfield Hill <winfieldhill@yahoo.com>
wrote:

John Larkin wrote...


https://www.mouser.com/ProductDetail/Texas-Instruments/ISO120SG?qs=sGAEpiMZZMtyhvbnOfCRF6Da9Qaki2LfCgmz7yeO868%3D

Been going since 1988. The design finally
gets some rest, after more than 40 years.
Click to expand...

I do hate it when people jack up prices by 10x, or 100x, near
end-of-life. I didn't think TI did that.


--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
 
lørdag den 8. juni 2019 kl. 00.32.15 UTC+2 skrev John Larkin:
On 7 Jun 2019 14:46:48 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:

John Larkin wrote...


https://www.mouser.com/ProductDetail/Texas-Instruments/ISO120SG?qs=sGAEpiMZZMtyhvbnOfCRF6Da9Qaki2LfCgmz7yeO868%3D

Been going since 1988. The design finally
gets some rest, after more than 40 years.

I do hate it when people jack up prices by 10x, or 100x, near
end-of-life. I didn't think TI did that.
Click to expand...

it makes sense in that it the limited supply then goes to those who
really really need it to fix some old gear, and not to someone who
has alternatives
 
On 2019-06-07, John Larkin <jjlarkin@highland_snip_technology.com> wrote:
On 7 Jun 2019 14:46:48 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:

John Larkin wrote...


https://www.mouser.com/ProductDetail/Texas-Instruments/ISO120SG?qs=sGAEpiMZZMtyhvbnOfCRF6Da9Qaki2LfCgmz7yeO868%3D

Been going since 1988. The design finally
gets some rest, after more than 40 years.

I do hate it when people jack up prices by 10x, or 100x, near
end-of-life. I didn't think TI did that.
Click to expand...

The alternative is a step from original price to priceless, you'd prefer
that?

--
When I tried casting out nines I made a hash of it.
 
On Fri, 7 Jun 2019 15:54:19 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

lřrdag den 8. juni 2019 kl. 00.32.15 UTC+2 skrev John Larkin:
On 7 Jun 2019 14:46:48 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:

John Larkin wrote...


https://www.mouser.com/ProductDetail/Texas-Instruments/ISO120SG?qs=sGAEpiMZZMtyhvbnOfCRF6Da9Qaki2LfCgmz7yeO868%3D

Been going since 1988. The design finally
gets some rest, after more than 40 years.

I do hate it when people jack up prices by 10x, or 100x, near
end-of-life. I didn't think TI did that.

it makes sense in that it the limited supply then goes to those who
really really need it to fix some old gear, and not to someone who
has alternatives
Click to expand...

So, how much did these USED to cost ?

boB
 
On 6/7/19 8:40 PM, Jasen Betts wrote:
On 2019-06-07, John Larkin <jjlarkin@highland_snip_technology.com> wrote:
On 7 Jun 2019 14:46:48 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:

John Larkin wrote...


https://www.mouser.com/ProductDetail/Texas-Instruments/ISO120SG?qs=sGAEpiMZZMtyhvbnOfCRF6Da9Qaki2LfCgmz7yeO868%3D

Been going since 1988. The design finally
gets some rest, after more than 40 years.

I do hate it when people jack up prices by 10x, or 100x, near
end-of-life. I didn't think TI did that.

The alternative is a step from original price to priceless, you'd prefer
that?
Click to expand...

sometimes there are some truly boggling statements made for a group with
so many proponents of the free-market capitalism...like they are
confused when the tenets of free-market capitalism mean they will have
to pay more. and someone will become richer at their expense.

the old saw I'm reminded of is "Don't hate the player hate the game"
 
On 6/7/19 6:31 PM, John Larkin wrote:
On 7 Jun 2019 14:46:48 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:

John Larkin wrote...


https://www.mouser.com/ProductDetail/Texas-Instruments/ISO120SG?qs=sGAEpiMZZMtyhvbnOfCRF6Da9Qaki2LfCgmz7yeO868%3D

Been going since 1988. The design finally
gets some rest, after more than 40 years.

I do hate it when people jack up prices by 10x, or 100x, near
end-of-life. I didn't think TI did that.
Click to expand...

Not Recommended for Your Wallet, either
 
boB wrote...
So, how much did these USED to cost ?
Click to expand...

I remember using a few, back in the day. Highly
specialized, ceramic package, etc. Yes they were
expensive, but super useful. I agree with keeping
old products alive for the few who really need it.


--
Thanks,
- Win
 
On Fri, 7 Jun 2019 15:54:19 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

lřrdag den 8. juni 2019 kl. 00.32.15 UTC+2 skrev John Larkin:
On 7 Jun 2019 14:46:48 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:

John Larkin wrote...


https://www.mouser.com/ProductDetail/Texas-Instruments/ISO120SG?qs=sGAEpiMZZMtyhvbnOfCRF6Da9Qaki2LfCgmz7yeO868%3D

Been going since 1988. The design finally
gets some rest, after more than 40 years.

I do hate it when people jack up prices by 10x, or 100x, near
end-of-life. I didn't think TI did that.

it makes sense in that it the limited supply then goes to those who
really really need it to fix some old gear, and not to someone who
has alternatives

That's the argument against price gouging laws.
Click to expand...
 
On Fri, 7 Jun 2019 22:03:08 -0400, bitrex <user@example.net> wrote:

On 6/7/19 8:40 PM, Jasen Betts wrote:
On 2019-06-07, John Larkin <jjlarkin@highland_snip_technology.com> wrote:
On 7 Jun 2019 14:46:48 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:

John Larkin wrote...


https://www.mouser.com/ProductDetail/Texas-Instruments/ISO120SG?qs=sGAEpiMZZMtyhvbnOfCRF6Da9Qaki2LfCgmz7yeO868%3D

Been going since 1988. The design finally
gets some rest, after more than 40 years.

I do hate it when people jack up prices by 10x, or 100x, near
end-of-life. I didn't think TI did that.

The alternative is a step from original price to priceless, you'd prefer
that?


sometimes there are some truly boggling statements made for a group with
so many proponents of the free-market capitalism...like they are
confused when the tenets of free-market capitalism mean they will have
to pay more. and someone will become richer at their expense.

the old saw I'm reminded of is "Don't hate the player hate the game"
Click to expand...

When suppliers cause us grief (like Maxim and lately NXP) we go
somewhere else. THAT is how capitalism works.

Part EOL is a serious problem for people who build things long-term.
Designs like PCs and phones and TVs have a lifetime of maybe one year,
so the OEMs can buy 60 million ICs and move on.






--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
 
On Fri, 07 Jun 2019 14:17:56 -0700, John Larkin
<jjlarkin@highland_snip_technology.com> wrote:

https://www.mouser.com/ProductDetail/Texas-Instruments/ISO120SG?qs=sGAEpiMZZMtyhvbnOfCRF6Da9Qaki2LfCgmz7yeO868%3D
Click to expand...

The TI AMC1100 looks nice. SiLabs also has some isolation amps, like
Si8920.

A shunt an an isolation amp looks like my best way to acquire the
voltage and current of my 400 Hz AC source. They do need a dc/dc
converter to power the isolated side.






--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
 
On 6/10/19 1:27 PM, John Larkin wrote:
On Fri, 7 Jun 2019 22:03:08 -0400, bitrex <user@example.net> wrote:

On 6/7/19 8:40 PM, Jasen Betts wrote:
On 2019-06-07, John Larkin <jjlarkin@highland_snip_technology.com> wrote:
On 7 Jun 2019 14:46:48 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:

John Larkin wrote...


https://www.mouser.com/ProductDetail/Texas-Instruments/ISO120SG?qs=sGAEpiMZZMtyhvbnOfCRF6Da9Qaki2LfCgmz7yeO868%3D

Been going since 1988. The design finally
gets some rest, after more than 40 years.

I do hate it when people jack up prices by 10x, or 100x, near
end-of-life. I didn't think TI did that.

The alternative is a step from original price to priceless, you'd prefer
that?


sometimes there are some truly boggling statements made for a group with
so many proponents of the free-market capitalism...like they are
confused when the tenets of free-market capitalism mean they will have
to pay more. and someone will become richer at their expense.

the old saw I'm reminded of is "Don't hate the player hate the game"

When suppliers cause us grief (like Maxim and lately NXP) we go
somewhere else. THAT is how capitalism works.

Part EOL is a serious problem for people who build things long-term.
Designs like PCs and phones and TVs have a lifetime of maybe one year,
so the OEMs can buy 60 million ICs and move on.
Click to expand...

Try not to take it personal, they didn't do it because they hate you.
"Business is business! And business must grow, regardless of crummies in
tummies, you know."
 
On 6/10/19 1:27 PM, John Larkin wrote:
On Fri, 7 Jun 2019 22:03:08 -0400, bitrex <user@example.net> wrote:

On 6/7/19 8:40 PM, Jasen Betts wrote:
On 2019-06-07, John Larkin <jjlarkin@highland_snip_technology.com> wrote:
On 7 Jun 2019 14:46:48 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:

John Larkin wrote...


https://www.mouser.com/ProductDetail/Texas-Instruments/ISO120SG?qs=sGAEpiMZZMtyhvbnOfCRF6Da9Qaki2LfCgmz7yeO868%3D

Been going since 1988. The design finally
gets some rest, after more than 40 years.

I do hate it when people jack up prices by 10x, or 100x, near
end-of-life. I didn't think TI did that.

The alternative is a step from original price to priceless, you'd prefer
that?


sometimes there are some truly boggling statements made for a group with
so many proponents of the free-market capitalism...like they are
confused when the tenets of free-market capitalism mean they will have
to pay more. and someone will become richer at their expense.

the old saw I'm reminded of is "Don't hate the player hate the game"

When suppliers cause us grief (like Maxim and lately NXP) we go
somewhere else. THAT is how capitalism works.

Part EOL is a serious problem for people who build things long-term.
Designs like PCs and phones and TVs have a lifetime of maybe one year,
so the OEMs can buy 60 million ICs and move on.
Click to expand...

Well if it were so easy to find a second source for this particular part
you wouldn't be griping about it.

My guess is they know "you" like it, and that it's not easy. :(
 
On Mon, 10 Jun 2019 21:58:31 -0400, krw@notreal.com wrote:

On Mon, 10 Jun 2019 10:27:25 -0700, John Larkin
jjlarkin@highland_snip_technology.com> wrote:

On Fri, 7 Jun 2019 22:03:08 -0400, bitrex <user@example.net> wrote:

On 6/7/19 8:40 PM, Jasen Betts wrote:
On 2019-06-07, John Larkin <jjlarkin@highland_snip_technology.com> wrote:
On 7 Jun 2019 14:46:48 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:

John Larkin wrote...


https://www.mouser.com/ProductDetail/Texas-Instruments/ISO120SG?qs=sGAEpiMZZMtyhvbnOfCRF6Da9Qaki2LfCgmz7yeO868%3D

Been going since 1988. The design finally
gets some rest, after more than 40 years.

I do hate it when people jack up prices by 10x, or 100x, near
end-of-life. I didn't think TI did that.

The alternative is a step from original price to priceless, you'd prefer
that?


sometimes there are some truly boggling statements made for a group with
so many proponents of the free-market capitalism...like they are
confused when the tenets of free-market capitalism mean they will have
to pay more. and someone will become richer at their expense.

the old saw I'm reminded of is "Don't hate the player hate the game"

When suppliers cause us grief (like Maxim and lately NXP) we go
somewhere else. THAT is how capitalism works.

Part EOL is a serious problem for people who build things long-term.
Designs like PCs and phones and TVs have a lifetime of maybe one year,
so the OEMs can buy 60 million ICs and move on.

OTOH, the automotive market demands a ten-year life and, amazingly,
Maxim and NXP are major players.
Click to expand...

If there are annual orders for tens of millions of parts, they'll keep
the fabs running.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics
 
On Mon, 10 Jun 2019 10:27:25 -0700, John Larkin
<jjlarkin@highland_snip_technology.com> wrote:

On Fri, 7 Jun 2019 22:03:08 -0400, bitrex <user@example.net> wrote:

On 6/7/19 8:40 PM, Jasen Betts wrote:
On 2019-06-07, John Larkin <jjlarkin@highland_snip_technology.com> wrote:
On 7 Jun 2019 14:46:48 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:

John Larkin wrote...


https://www.mouser.com/ProductDetail/Texas-Instruments/ISO120SG?qs=sGAEpiMZZMtyhvbnOfCRF6Da9Qaki2LfCgmz7yeO868%3D

Been going since 1988. The design finally
gets some rest, after more than 40 years.

I do hate it when people jack up prices by 10x, or 100x, near
end-of-life. I didn't think TI did that.

The alternative is a step from original price to priceless, you'd prefer
that?


sometimes there are some truly boggling statements made for a group with
so many proponents of the free-market capitalism...like they are
confused when the tenets of free-market capitalism mean they will have
to pay more. and someone will become richer at their expense.

the old saw I'm reminded of is "Don't hate the player hate the game"

When suppliers cause us grief (like Maxim and lately NXP) we go
somewhere else. THAT is how capitalism works.

Part EOL is a serious problem for people who build things long-term.
Designs like PCs and phones and TVs have a lifetime of maybe one year,
so the OEMs can buy 60 million ICs and move on.
Click to expand...

OTOH, the automotive market demands a ten-year life and, amazingly,
Maxim and NXP are major players.
 
On Monday, June 10, 2019 at 3:32:50 PM UTC-7, John Larkin wrote:

A shunt an an isolation amp looks like my best way to acquire the
voltage and current of my 400 Hz AC source. They do need a dc/dc
converter to power the isolated side.
Click to expand...

If it's a wye threephase system, only one isolated converter, three iso amps
for voltages, and three hall sensors for currents. It's unclear whether
there's any need for shunts.
 
On Tue, 11 Jun 2019 03:53:39 -0700 (PDT), whit3rd <whit3rd@gmail.com>
wrote:

On Monday, June 10, 2019 at 3:32:50 PM UTC-7, John Larkin wrote:

A shunt an an isolation amp looks like my best way to acquire the
voltage and current of my 400 Hz AC source. They do need a dc/dc
converter to power the isolated side.

If it's a wye threephase system, only one isolated converter, three iso amps
for voltages, and three hall sensors for currents. It's unclear whether
there's any need for shunts.
Click to expand...

We plan to make three isolated phases that can be connected any way,
usually wye.

We need to measure output voltage and current, wideband, because we
want to synthesize the complex impedances of the sources. And report
our own output. Maybe provide waveforms.

I'm thinking that a shunt and an isol amp would be better than a Hall.
Halls are drifty and noisy.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics
 
On Tuesday, June 11, 2019 at 6:59:16 AM UTC-7, John Larkin wrote:
On Tue, 11 Jun 2019 03:53:39 -0700 (PDT), whit3rd <whit3rd@gmail.com

I'm thinking that a shunt and an isol amp would be better than a Hall.
Halls are drifty and noisy.
Click to expand...

Noise won't hurt a Z measurement much, and drift (in an AC
environment) isn't usually a major problem either. But, every time I think
I want a shunt, i don't like ANY of the possible values; too-big and
too-small resistors are all that I can locate.
 
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