Zeners in Series

On 13 Nov 2019 00:40:42 -0800, Winfield Hill <winfieldhill@yahoo.com>
wrote:

jlarkin@highlandsniptechnology.com wrote...

Here's my programmable power supply for an extreme-UV (13 nm)
photodiode. It has a dual diode AND zeners in series.

https://www.dropbox.com/s/9e2ojyx0beflcaq/ESM_PD_Supply.jpg?raw=1

Try to surrender with dignity.

The voltage at TP15 is about +120.

The input AC is high frequency, swiped from the main
DC-DC converter circuit. Here's the whole sheet:

https://www.dropbox.com/s/cs1lhp7gslfs3e0/ESM_power.pdf?dl=0

We've sold about 3500 of these with roughly zero failures.

Interesting. But I couldn't find any information about
the T932 on your website.
Click to expand...

It's part of an OEM laser controller. About half of our business is
custom OEM stuff. A lot of the visible products are losers, don't
sell, but they work as advertising, show capability, and are fodder
for press releases, which make links.

We did have the customer logo on our site

http://www.highlandtechnology.com/company/customers.shtml

but they saw it and made us take it down.

Since you don't know who they are, allow me to say that they are real
jerks.



--

John Larkin Highland Technology, Inc

lunatic fringe electronics
 
jlarkin@highlandsniptechnology.com wrote...
Since you don't know who they are, allow
me to say that they are real jerks.
Click to expand...

If a jerk purchases 3500 pieces, presumably at
a reasonable profit, that's not so bad. You can
suppress your feelings all the way to the bank.


--
Thanks,
- Win
 
On 13 Nov 2019 09:29:51 -0800, Winfield Hill <winfieldhill@yahoo.com>
wrote:

jlarkin@highlandsniptechnology.com wrote...

Since you don't know who they are, allow
me to say that they are real jerks.

If a jerk purchases 3500 pieces, presumably at
a reasonable profit, that's not so bad. You can
suppress your feelings all the way to the bank.
Click to expand...

That is some small consolation.

What's tragic is how many billions of dollars they make.



--

John Larkin Highland Technology, Inc

lunatic fringe electronics
 
On 11/12/2019 11:41 AM, jlarkin@highlandsniptechnology.com wrote:
On Mon, 11 Nov 2019 21:37:34 -0800, Robert Baer
robertbaer@localnet.com> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Sun, 10 Nov 2019 14:34:38 -0800, Robert Baer
robertbaer@localnet.com> wrote:

Cursitor Doom wrote:
On Sat, 09 Nov 2019 18:38:31 -0800, jlarkin wrote:

I even -gasp- sometimes use only half of a dual diode!

But ridicule? Reputation? Who would know?

Everyone here, now you've admitted to still using dual diodes!
:-D



Get out the swords, let's duel!

Here's my programmable power supply for an extreme-UV (13 nm)
photodiode. It has a dual diode AND zeners in series.

https://www.dropbox.com/s/9e2ojyx0beflcaq/ESM_PD_Supply.jpg?raw=1


Try to surrender with dignity.



Shouldn't C73, C77 be rated at least 500V? More like 1000V for safety?
At least C64 is protected by R88 (pop).
And....those BAV23S seem to be rated at a paltry 200V which will
surely fry shorted.
FURthermore, will that transformer withstand AC line voltage?

Gurr.


The voltage at TP15 is about +120.

The input AC is high frequency, swiped from the main DC-DC converter
circuit. Here's the whole sheet:

https://www.dropbox.com/s/cs1lhp7gslfs3e0/ESM_power.pdf?dl=0

We've sold about 3500 of these with roughly zero failures.
Click to expand...

What does "roughly zero" mean? Is it zero or +/- SomethingLarge?
 
On Thu, 14 Nov 2019 15:37:15 -0600, John S <Sophi.2@invalid.org>
wrote:

On 11/12/2019 11:41 AM, jlarkin@highlandsniptechnology.com wrote:
On Mon, 11 Nov 2019 21:37:34 -0800, Robert Baer
robertbaer@localnet.com> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Sun, 10 Nov 2019 14:34:38 -0800, Robert Baer
robertbaer@localnet.com> wrote:

Cursitor Doom wrote:
On Sat, 09 Nov 2019 18:38:31 -0800, jlarkin wrote:

I even -gasp- sometimes use only half of a dual diode!

But ridicule? Reputation? Who would know?

Everyone here, now you've admitted to still using dual diodes!
:-D



Get out the swords, let's duel!

Here's my programmable power supply for an extreme-UV (13 nm)
photodiode. It has a dual diode AND zeners in series.

https://www.dropbox.com/s/9e2ojyx0beflcaq/ESM_PD_Supply.jpg?raw=1


Try to surrender with dignity.



Shouldn't C73, C77 be rated at least 500V? More like 1000V for safety?
At least C64 is protected by R88 (pop).
And....those BAV23S seem to be rated at a paltry 200V which will
surely fry shorted.
FURthermore, will that transformer withstand AC line voltage?

Gurr.


The voltage at TP15 is about +120.

The input AC is high frequency, swiped from the main DC-DC converter
circuit. Here's the whole sheet:

https://www.dropbox.com/s/cs1lhp7gslfs3e0/ESM_power.pdf?dl=0

We've sold about 3500 of these with roughly zero failures.


What does "roughly zero" mean? Is it zero or +/- SomethingLarge?
Click to expand...

We've got a few back that were mechanically mangled. There was a burst
of failures from one site caused by some outrageous ground loops that
incinerated some line drivers.

It's basically a 250 MHz, 12 bit ADC that integrates light pulse
energy and can acquire waveforms.

https://www.dropbox.com/s/6equeg187v98xdu/ESM_PCB.jpg?raw=1

That switching power supply is an inch or so away from the ADC, and
noise is under 1 lsb RMS.

--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
 
John Larkin <jlarkin@highland_atwork_technology.com> wrote:

On Thu, 14 Nov 2019 15:37:15 -0600, John S <Sophi.2@invalid.org
wrote:

On 11/12/2019 11:41 AM, jlarkin@highlandsniptechnology.com wrote:
On Mon, 11 Nov 2019 21:37:34 -0800, Robert Baer
robertbaer@localnet.com> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Sun, 10 Nov 2019 14:34:38 -0800, Robert Baer
robertbaer@localnet.com> wrote:

Cursitor Doom wrote:
On Sat, 09 Nov 2019 18:38:31 -0800, jlarkin wrote:

I even -gasp- sometimes use only half of a dual diode!

But ridicule? Reputation? Who would know?

Everyone here, now you've admitted to still using dual diodes!
:-D



Get out the swords, let's duel!

Here's my programmable power supply for an extreme-UV (13 nm)
photodiode. It has a dual diode AND zeners in series.

https://www.dropbox.com/s/9e2ojyx0beflcaq/ESM_PD_Supply.jpg?raw=1


Try to surrender with dignity.



Shouldn't C73, C77 be rated at least 500V? More like 1000V for
safety? At least C64 is protected by R88 (pop).
And....those BAV23S seem to be rated at a paltry 200V which will
surely fry shorted.
FURthermore, will that transformer withstand AC line voltage?

Gurr.


The voltage at TP15 is about +120.

The input AC is high frequency, swiped from the main DC-DC converter
circuit. Here's the whole sheet:

https://www.dropbox.com/s/cs1lhp7gslfs3e0/ESM_power.pdf?dl=0

We've sold about 3500 of these with roughly zero failures.


What does "roughly zero" mean? Is it zero or +/- SomethingLarge?

We've got a few back that were mechanically mangled. There was a burst
of failures from one site caused by some outrageous ground loops that
incinerated some line drivers.

It's basically a 250 MHz, 12 bit ADC that integrates light pulse
energy and can acquire waveforms.

https://www.dropbox.com/s/6equeg187v98xdu/ESM_PCB.jpg?raw=1

That switching power supply is an inch or so away from the ADC, and
noise is under 1 lsb RMS.
Click to expand...

Measuring Switching Regulator Noise
https://www.youtube.com/watch?v=wegvf39IeTU

Other Jim Williams Videos
https://www.youtube.com/results?
search_query=jim+williams+Measuring+Switching+Regulator+Noise

Watch the wrap.
 
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