Forums

Zeners in Series

Started by Cursitor Doom November 9, 2019
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.
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.
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.
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. >
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?
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.
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.
l&oslash;rdag den 16. november 2019 kl. 14.17.18 UTC+1 skrev Tom Del Rosso:
> jlarkin@highlandsniptechnology.com wrote: > > On Sun, 10 Nov 2019 18:55:13 -0500, "Tom Del Rosso" > > <fizzbintuesday@that-google-mail-domain.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 > >> > >> Why the wacky transformer connection? > > > > It's a stock, cheap ISDN transformer. The AC is stolen from another > > circuit, an isolated dc-dc converter. > > Yes but the way the secondary feeds back to both sides of the other > transformer, it looks like the purpose is to double the voltage. I've > never seen it done that way.
tripple, you could draw it as one primary and three secondaries
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
What's the ISDN transformer's p/n? It's nice and small, right? Will any old one work? -- Thanks, - Win
On Sat, 16 Nov 2019 05:14:34 -0500, "Tom Del Rosso"
<fizzbintuesday@that-google-mail-domain.com> wrote:

>jlarkin@highlandsniptechnology.com wrote: >> On Sun, 10 Nov 2019 18:55:13 -0500, "Tom Del Rosso" >> <fizzbintuesday@that-google-mail-domain.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 >>> >>> Why the wacky transformer connection? >> >> It's a stock, cheap ISDN transformer. The AC is stolen from another >> circuit, an isolated dc-dc converter. > >Yes but the way the secondary feeds back to both sides of the other >transformer, it looks like the purpose is to double the voltage. I've >never seen it done that way. > >
The ISDN transformer windings are 1:1:2:2, so it's connected as 1:5. The connection is the way it worked on the PCB layout. I assume that ISDN is dead, but the transformers are still available. -- John Larkin Highland Technology, Inc lunatic fringe electronics
On 16 Nov 2019 07:21:16 -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 > > What's the ISDN transformer's p/n? It's nice > and small, right? Will any old one work?
This one is 1:1:2:2, being used as 5:1. TALEMA SMJ-140B which can be hard to get, or MINNTRONIX 4809184R -- John Larkin Highland Technology, Inc lunatic fringe electronics