Forums

Zeners in Series

Started by Cursitor Doom November 9, 2019
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!
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. -- John Larkin Highland Technology, Inc lunatic fringe electronics
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? Is Q3 really supposed to short the output or is that a stray dot at that junction?
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.
> >Is Q3 really supposed to short the output or is that a stray dot at that >junction? > >
Stray dot? The mosfet gate drive net name is a hint. The powerup default is zero volts. -- John Larkin Highland Technology, Inc lunatic fringe electronics
On Sunday, November 10, 2019 at 6:17:06 PM UTC-5, jla...@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
Oh that's fun and just my 'speed'. Thanks. George H.
> > > Try to surrender with dignity. > > > > -- > > John Larkin Highland Technology, Inc > > lunatic fringe electronics
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.
tirsdag den 12. november 2019 kl. 06.37.40 UTC+1 skrev Robert Baer:
> 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.
for a 75V supply?
> FURthermore, will that transformer withstand AC line voltage? > > Gurr.
AC line voltage?
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. -- John Larkin Highland Technology, Inc lunatic fringe electronics
Lasse Langwadt Christensen wrote:
> tirsdag den 12. november 2019 kl. 06.37.40 UTC+1 skrev Robert Baer: >> 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. > > for a 75V supply? > >> FURthermore, will that transformer withstand AC line voltage? >> >> Gurr. > > AC line voltage? >
Schematic DOES say AC..
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. -- Thanks, - Win