On a sunny day (Sat, 04 Mar 2023 16:51:43 +0100) it happened
albert@cherry.(none) (albert) wrote in
<nnd$0a2d5eb5$1412e81e@fc8c527ab1ceb1c2>:
>In article <ttvknj$1ji60$1@solani.org>,
>Jan Panteltje <alien@comet.invalid> wrote:
>>On a sunny day (Sat, 04 Mar 2023 14:36:16 +0100) it happened
>>albert@cherry.(none) (albert) wrote in
>><nnd$7acfcb2d$57eea267@f9cc46d0748b1590>:
>>
><SNIP>
>>
>>>I can't access the site and the pictures are not visible in GIMP. (I
>>>used wget).
>>
>>I uploaded 2 of the images using imgbox, its free:
>> https://imgbox.com/zmFpnUmh
>> https://imgbox.com/UlT7A3YP
>>
>>
>>
>>Panteltje.com is now down as I fired godaddy as my webhosting company
>>because they changed from pop email to microsoft crap,
>>had no working helpdesk, changed all file timestamps to the same day, etc. etc..
>>
>>I bought 2 new domains, panteltje,nl and panteltje,online
>>
>>../pub/ and its subdirectories has not been uploaded yet (maybe later).
>>
>>but
>> https://panteltje.nl/panteltje/newsflex/download.html
>> shows some other projects.
>>
>>Site is now hosted by antagonist,nl no longer in 'merrica.
>>
>>
>>>javascript is needed? Why?
>>
>>I do not use javascript on my website.
>>Maybe old godaddy crap, that domain they keep active until December if I
>>got it right..
>>I did cancel it, and did rm * -rf on my site there...
>>It is just US blackmail to force me to stay with them.
>>
>>WW3 will likely be next year so we will see where it goes.
>
>I understand you own the url. Why not host that url on some
>other surver instead of goddaddy ? Or do you take the opportunity
>to switch to .nl website? That is unpleasant for your regular
>visitors.
Well, I could have transfered .com to my current web hoster.
But it cost extra AFAIK.
Anyone can google for panteltje and find the announcement .com is down
it is the second link that came up just now, and that leads to the discussion we had here,
panteltje.nl
and
panteltje.online
are the new site adresses.
godaddy is a mess, the URL is secureserver.net
I found out godaddy has some office near Schiphol airport in .nl
My website changed servers several times with them.
I do it for fun, my webiste, first it was running at home as I had a fixed IP address
2003 I went to godaddy but it got worse and worse.
Am just 4G portable now (USB stick) so .. KPN changes IP address every few moments it seems,
even if you stay logged it..
That creates its own problems...
If I get fed up I just cancel the website.. 25 years a website.. maybe time for something new.
Too much digitalization here, from banks and money to gov sites, to news,
one big EMP and it all evaporates.
Before internet I was using Viditel (link is in Dutch):
https://historiek.net/viditel-eerste-publieke-onlinedienst-van-nederland/143609/
Maybe after the nuking I will use smoke signs.... spark transmitter....
>Groetjes Albert
>--
>Don't praise the day before the evening. One swallow doesn't make spring.
>You must not say "hey" before you have crossed the bridge. Don't sell the
>hide of the bear until you shot it. Better one bird in the hand than ten in
>the air. First gain is a cat spinning. - the Wise from Antrim -
>
Reply by none●March 4, 20232023-03-04
In article <ttvknj$1ji60$1@solani.org>,
Jan Panteltje <alien@comet.invalid> wrote:
>On a sunny day (Sat, 04 Mar 2023 14:36:16 +0100) it happened
>albert@cherry.(none) (albert) wrote in
><nnd$7acfcb2d$57eea267@f9cc46d0748b1590>:
>
<SNIP>
>
>>I can't access the site and the pictures are not visible in GIMP. (I
>>used wget).
>
>I uploaded 2 of the images using imgbox, its free:
> https://imgbox.com/zmFpnUmh
> https://imgbox.com/UlT7A3YP
>
>
>
>Panteltje.com is now down as I fired godaddy as my webhosting company
>because they changed from pop email to microsoft crap,
>had no working helpdesk, changed all file timestamps to the same day, etc. etc..
>
>I bought 2 new domains, panteltje,nl and panteltje,online
>
>../pub/ and its subdirectories has not been uploaded yet (maybe later).
>
>but
> https://panteltje.nl/panteltje/newsflex/download.html
> shows some other projects.
>
>Site is now hosted by antagonist,nl no longer in 'merrica.
>
>
>>javascript is needed? Why?
>
>I do not use javascript on my website.
>Maybe old godaddy crap, that domain they keep active until December if I
>got it right..
>I did cancel it, and did rm * -rf on my site there...
>It is just US blackmail to force me to stay with them.
>
>WW3 will likely be next year so we will see where it goes.
I understand you own the url. Why not host that url on some
other surver instead of goddaddy ? Or do you take the opportunity
to switch to .nl website? That is unpleasant for your regular
visitors.
Groetjes Albert
--
Don't praise the day before the evening. One swallow doesn't make spring.
You must not say "hey" before you have crossed the bridge. Don't sell the
hide of the bear until you shot it. Better one bird in the hand than ten in
the air. First gain is a cat spinning. - the Wise from Antrim -
Reply by Jan Panteltje●March 4, 20232023-03-04
On a sunny day (Sat, 04 Mar 2023 14:36:16 +0100) it happened
albert@cherry.(none) (albert) wrote in
<nnd$7acfcb2d$57eea267@f9cc46d0748b1590>:
>I can't access the site and the pictures are not visible in GIMP. (I
>used wget).
I uploaded 2 of the images using imgbox, its free:
https://imgbox.com/zmFpnUmhhttps://imgbox.com/UlT7A3YP
Panteltje.com is now down as I fired godaddy as my webhosting company because they changed from pop email to microsoft crap,
had no working helpdesk, changed all file timestamps to the same day, etc. etc..
I bought 2 new domains, panteltje,nl and panteltje,online
../pub/ and its subdirectories has not been uploaded yet (maybe later).
but
https://panteltje.nl/panteltje/newsflex/download.html
shows some other projects.
Site is now hosted by antagonist,nl no longer in 'merrica.
>javascript is needed? Why?
I do not use javascript on my website.
Maybe old godaddy crap, that domain they keep active until December if I got it right..
I did cancel it, and did rm * -rf on my site there...
It is just US blackmail to force me to stay with them.
WW3 will likely be next year so we will see where it goes.
I can't access the site and the pictures are not visible in GIMP. (I
used wget).
javascript is needed? Why?
Groetjes Albert
>
>
--
Don't praise the day before the evening. One swallow doesn't make spring.
You must not say "hey" before you have crossed the bridge. Don't sell the
hide of the bear until you shot it. Better one bird in the hand than ten in
the air. First gain is a cat spinning. - the Wise from Antrim -
Reply by Phil Hobbs●February 20, 20232023-02-20
On 2023-02-20 19:00, Lasse Langwadt Christensen wrote:
> tirsdag den 21. februar 2023 kl. 00.42.41 UTC+1 skrev Phil Hobbs:
>> On 2023-02-08 19:35, Phil Hobbs wrote:
>>> On 2023-02-08 15:05, John Larkin wrote:
>>>> On Wed, 8 Feb 2023 13:57:10 -0500, Phil Hobbs
>>>> <pcdhSpamM...@electrooptical.net> wrote:
>>>>
>>>>> On 2023-02-07 22:34, John Larkin wrote:
>>>>>> On Tue, 7 Feb 2023 13:23:46 -0500, Phil Hobbs
>>>>>> <pcdhSpamM...@electrooptical.net> wrote:
>>>>>>
>>>>>>> On 2023-02-07 12:35, John Larkin wrote:
>>>>>>>> On Tue, 7 Feb 2023 02:48:47 -0500, Phil Hobbs
>>>>>>>> <pcdhSpamM...@electrooptical.net> wrote:
>>>>>>>>
>>>>>>>>> On 2023-02-06 20:11, whit3rd wrote:
>>>>>>>>>> On Monday, February 6, 2023 at 3:38:45 PM UTC-8, John Larkin wrote:
>>>>>>>>>>> On Mon, 6 Feb 2023 15:28:31 -0800 (PST), Phil Allison
>>>>>>>>>>> <palli...@gmail.com> wrote:
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>>> There is no such thing as " wrong" polarity when DC plugs are
>>>>>>>>>>>> fitted to leads.
>>>>>>>>>>>> Some are positive tip and the rest negative.
>>>>>>>>>>>> Wot planet do you live on ?
>>>>>>>>>>
>>>>>>>>>>> We buy DC warts that have the inner part of the barrel connector
>>>>>>>>>>> positive. Negative would certainly be wrong.
>>>>>>>>>>
>>>>>>>>>> That's a flawed certainty.
>>>>>>>>>> Here is a counterexample; the center is negative, and it isn't just
>>>>>>>>>> the label, my multimeter says so too.
>>>>>>>>>>
>>>>>>>>>> <https://photos.app.goo.gl/7RSyQpJ4NQrKzfgu5>
>>>>>>>>>>
>>>>>>>>>> What's really spooky, is that I recall an identical manufacturer
>>>>>>>>>> and part number unit
>>>>>>>>>> with center positive (also correctly labelled).
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>> A P-channel FET or a series Schottky diode fixes that. I'd never
>>>>>>>>> omit
>>>>>>>>> polarity protection from any design--even my hand-wired protos have
>>>>>>>>> shunt 1N5819s or 1N5823s.
>>>>>>>>>
>>>>>>>>> I don't use shunt diodes in products or customer designs--in the
>>>>>>>>> low-noise instruments world, it's far from unknown for people to
>>>>>>>>> power
>>>>>>>>> 24V stuff from two boat batteries in series.
>>>>>>>>>
>>>>>>>>> Interesting point, though--it might be a good idea to put an NFET
>>>>>>>>> in the
>>>>>>>>> negative lead as well as a PFET in the positive one, to protect
>>>>>>>>> against
>>>>>>>>> shorts from V- to ground. It could be a depletion device to
>>>>>>>>> guarantee
>>>>>>>>> startup behavior. I'll think about that.
>>>>>>>>>
>>>>>>>
>>>>>>>> I generally use a polyfuse and a big unipolar TVS first thing. That
>>>>>>>> handles reverse voltage and some (not all) over-voltage cases. But
>>>>>>>> I'd
>>>>>>>> rather have the TVS fail shorted, than blow up everything downstream.
>>>>>>>>
>>>>>>>> TVS shorted can be blamed on the customer!
>>>>>>>>
>>>>>>>> Bulletproof startup can be challenging.
>>>>>>>>
>>>>>>>> We hard-ground everything in our boxes and assume that a customer
>>>>>>>> might want to power us from their, usually grounded, roughly 24 volt
>>>>>>>> DC buss.
>>>>>>>
>>>>>>> We often do that too, and used to do it more when we could still get
>>>>>>> PolyZens, which were a wonderfully complete and compact solution
>>>>>>> (*sniff* *sniff*).
>>>>>>>
>>>>>>> A big TVS can desolder itself and fall off the board if the PCB is
>>>>>>> vertical.
>>>>>>>
>>>>>>> Most of our stuff has switchers and lots of filtering, and so runs
>>>>>>> fine
>>>>>>> off a common power buss. The rail splitter thing is for light-duty
>>>>>>> use.
>>>>>>>
>>>>>>> Cheers
>>>>>>>
>>>>>>> Phil Hobbs
>>>>>>
>>>>>> Take a look at IXYS CPC1540GS.
>>>>>>
>>>>>> It's a high-voltage bidirectional SSR with current and thermal
>>>>>> limiting.
>>>>>>
>>>>>> I've used it as just a current limiter. This and a TVS might be a nice
>>>>>> combination. Drive the LED side with a resistor or a depletion fet.
>>>>>>
>>>>>> Some clever LED-side driver might do under/overvoltage lockout too.
>>>>>>
>>>>>
>>>>> Nice part, but its maximum Ron of 25 ohms is on the high side.
>>>
>>>>
>>>> It's 4 ohms in unipolar mode, which is better but doesn't do reverse
>>>> protection the obvious way.
>>>>
>>>> I want a higher-power version.
>>>>
>>>> Consider, maybe, a biggish SSR and a small ssr or optocoupler to
>>>> measure the ON voltage drop for shutdown.
>>>>
>>>
>>> Nah, I'll stick with 70 cents worth of small FETs and a resistor pack
>>> for the grounded-wart fault condition, and let the polyfuse look after
>>> overcurrent. The TCA0372 will be pretty much loafing at current levels
>>> I care about for this use.
>>>
>>> The FETs would be cheaper still except that I need >24 V_GSmax--for
>>> PFETs, I wound up with DMP3056es for all three, and for NFETs, DMG3406L
>>> pass devices and a MCC 2N7002A driver.
>>
>>
>> We just got the first batch of ten rail splitter boards in from JLCPCB.
>> <https://electrooptical.net/www/sed/wallwartsplitter.pdf>
>>
>> They work great--if you short either side of the wart to ground, the
>> FETs open up and latch that way until you cycle the power. It's also
>> polarity-protected, of course.
>>
>> These ones get clamped to a metal baseplate with a thermal gap pad to
>> cool the TCA0372.
>>
>
> who not use both sections of the opamp?
>
Because their DC offsets will in general be different. That means
they'll fight, unless we put resistors in series with the outputs.
The silicon hardly contributes to the overall thermal resistance.
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.nethttp://hobbs-eo.com
Reply by Lasse Langwadt Christensen●February 20, 20232023-02-20
tirsdag den 21. februar 2023 kl. 00.42.41 UTC+1 skrev Phil Hobbs:
> On 2023-02-08 19:35, Phil Hobbs wrote:
> > On 2023-02-08 15:05, John Larkin wrote:
> >> On Wed, 8 Feb 2023 13:57:10 -0500, Phil Hobbs
> >> <pcdhSpamM...@electrooptical.net> wrote:
> >>
> >>> On 2023-02-07 22:34, John Larkin wrote:
> >>>> On Tue, 7 Feb 2023 13:23:46 -0500, Phil Hobbs
> >>>> <pcdhSpamM...@electrooptical.net> wrote:
> >>>>
> >>>>> On 2023-02-07 12:35, John Larkin wrote:
> >>>>>> On Tue, 7 Feb 2023 02:48:47 -0500, Phil Hobbs
> >>>>>> <pcdhSpamM...@electrooptical.net> wrote:
> >>>>>>
> >>>>>>> On 2023-02-06 20:11, whit3rd wrote:
> >>>>>>>> On Monday, February 6, 2023 at 3:38:45 PM UTC-8, John Larkin wrote:
> >>>>>>>>> On Mon, 6 Feb 2023 15:28:31 -0800 (PST), Phil Allison
> >>>>>>>>> <palli...@gmail.com> wrote:
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>>> There is no such thing as " wrong" polarity when DC plugs are
> >>>>>>>>>> fitted to leads.
> >>>>>>>>>> Some are positive tip and the rest negative.
> >>>>>>>>>> Wot planet do you live on ?
> >>>>>>>>
> >>>>>>>>> We buy DC warts that have the inner part of the barrel connector
> >>>>>>>>> positive. Negative would certainly be wrong.
> >>>>>>>>
> >>>>>>>> That's a flawed certainty.
> >>>>>>>> Here is a counterexample; the center is negative, and it isn't just
> >>>>>>>> the label, my multimeter says so too.
> >>>>>>>>
> >>>>>>>> <https://photos.app.goo.gl/7RSyQpJ4NQrKzfgu5>
> >>>>>>>>
> >>>>>>>> What's really spooky, is that I recall an identical manufacturer
> >>>>>>>> and part number unit
> >>>>>>>> with center positive (also correctly labelled).
> >>>>>>>>
> >>>>>>>
> >>>>>>> A P-channel FET or a series Schottky diode fixes that. I'd never
> >>>>>>> omit
> >>>>>>> polarity protection from any design--even my hand-wired protos have
> >>>>>>> shunt 1N5819s or 1N5823s.
> >>>>>>>
> >>>>>>> I don't use shunt diodes in products or customer designs--in the
> >>>>>>> low-noise instruments world, it's far from unknown for people to
> >>>>>>> power
> >>>>>>> 24V stuff from two boat batteries in series.
> >>>>>>>
> >>>>>>> Interesting point, though--it might be a good idea to put an NFET
> >>>>>>> in the
> >>>>>>> negative lead as well as a PFET in the positive one, to protect
> >>>>>>> against
> >>>>>>> shorts from V- to ground. It could be a depletion device to
> >>>>>>> guarantee
> >>>>>>> startup behavior. I'll think about that.
> >>>>>>>
> >>>>>
> >>>>>> I generally use a polyfuse and a big unipolar TVS first thing. That
> >>>>>> handles reverse voltage and some (not all) over-voltage cases. But
> >>>>>> I'd
> >>>>>> rather have the TVS fail shorted, than blow up everything downstream.
> >>>>>>
> >>>>>> TVS shorted can be blamed on the customer!
> >>>>>>
> >>>>>> Bulletproof startup can be challenging.
> >>>>>>
> >>>>>> We hard-ground everything in our boxes and assume that a customer
> >>>>>> might want to power us from their, usually grounded, roughly 24 volt
> >>>>>> DC buss.
> >>>>>
> >>>>> We often do that too, and used to do it more when we could still get
> >>>>> PolyZens, which were a wonderfully complete and compact solution
> >>>>> (*sniff* *sniff*).
> >>>>>
> >>>>> A big TVS can desolder itself and fall off the board if the PCB is
> >>>>> vertical.
> >>>>>
> >>>>> Most of our stuff has switchers and lots of filtering, and so runs
> >>>>> fine
> >>>>> off a common power buss. The rail splitter thing is for light-duty
> >>>>> use.
> >>>>>
> >>>>> Cheers
> >>>>>
> >>>>> Phil Hobbs
> >>>>
> >>>> Take a look at IXYS CPC1540GS.
> >>>>
> >>>> It's a high-voltage bidirectional SSR with current and thermal
> >>>> limiting.
> >>>>
> >>>> I've used it as just a current limiter. This and a TVS might be a nice
> >>>> combination. Drive the LED side with a resistor or a depletion fet.
> >>>>
> >>>> Some clever LED-side driver might do under/overvoltage lockout too.
> >>>>
> >>>
> >>> Nice part, but its maximum Ron of 25 ohms is on the high side.
> >
> >>
> >> It's 4 ohms in unipolar mode, which is better but doesn't do reverse
> >> protection the obvious way.
> >>
> >> I want a higher-power version.
> >>
> >> Consider, maybe, a biggish SSR and a small ssr or optocoupler to
> >> measure the ON voltage drop for shutdown.
> >>
> >
> > Nah, I'll stick with 70 cents worth of small FETs and a resistor pack
> > for the grounded-wart fault condition, and let the polyfuse look after
> > overcurrent. The TCA0372 will be pretty much loafing at current levels
> > I care about for this use.
> >
> > The FETs would be cheaper still except that I need >24 V_GSmax--for
> > PFETs, I wound up with DMP3056es for all three, and for NFETs, DMG3406L
> > pass devices and a MCC 2N7002A driver.
>
>
> We just got the first batch of ten rail splitter boards in from JLCPCB.
> <https://electrooptical.net/www/sed/wallwartsplitter.pdf>
>
> They work great--if you short either side of the wart to ground, the
> FETs open up and latch that way until you cycle the power. It's also
> polarity-protected, of course.
>
> These ones get clamped to a metal baseplate with a thermal gap pad to
> cool the TCA0372.
>
who not use both sections of the opamp?
Reply by Phil Hobbs●February 20, 20232023-02-20
On 2023-02-08 19:35, Phil Hobbs wrote:
> On 2023-02-08 15:05, John Larkin wrote:
>> On Wed, 8 Feb 2023 13:57:10 -0500, Phil Hobbs
>> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>>
>>> On 2023-02-07 22:34, John Larkin wrote:
>>>> On Tue, 7 Feb 2023 13:23:46 -0500, Phil Hobbs
>>>> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>>>>
>>>>> On 2023-02-07 12:35, John Larkin wrote:
>>>>>> On Tue, 7 Feb 2023 02:48:47 -0500, Phil Hobbs
>>>>>> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>>>>>>
>>>>>>> On 2023-02-06 20:11, whit3rd wrote:
>>>>>>>> On Monday, February 6, 2023 at 3:38:45 PM UTC-8, John Larkin wrote:
>>>>>>>>> On Mon, 6 Feb 2023 15:28:31 -0800 (PST), Phil Allison
>>>>>>>>> <palli...@gmail.com> wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>>>> There is no such thing as " wrong" polarity when DC plugs are
>>>>>>>>>> fitted to leads.
>>>>>>>>>> Some are positive tip and the rest negative.
>>>>>>>>>> Wot planet do you live on ?
>>>>>>>>
>>>>>>>>> We buy DC warts that have the inner part of the barrel connector
>>>>>>>>> positive. Negative would certainly be wrong.
>>>>>>>>
>>>>>>>> That's a flawed certainty.
>>>>>>>> Here is a counterexample; the center is negative, and it isn't just
>>>>>>>> the label, my multimeter says so too.
>>>>>>>>
>>>>>>>> <https://photos.app.goo.gl/7RSyQpJ4NQrKzfgu5>
>>>>>>>>
>>>>>>>> What's really spooky, is that I recall an identical manufacturer
>>>>>>>> and part number unit
>>>>>>>> with center positive (also correctly labelled).
>>>>>>>>
>>>>>>>
>>>>>>> A P-channel FET or a series Schottky diode fixes that. I'd never
>>>>>>> omit
>>>>>>> polarity protection from any design--even my hand-wired protos have
>>>>>>> shunt 1N5819s or 1N5823s.
>>>>>>>
>>>>>>> I don't use shunt diodes in products or customer designs--in the
>>>>>>> low-noise instruments world, it's far from unknown for people to
>>>>>>> power
>>>>>>> 24V stuff from two boat batteries in series.
>>>>>>>
>>>>>>> Interesting point, though--it might be a good idea to put an NFET
>>>>>>> in the
>>>>>>> negative lead as well as a PFET in the positive one, to protect
>>>>>>> against
>>>>>>> shorts from V- to ground. It could be a depletion device to
>>>>>>> guarantee
>>>>>>> startup behavior. I'll think about that.
>>>>>>>
>>>>>
>>>>>> I generally use a polyfuse and a big unipolar TVS first thing. That
>>>>>> handles reverse voltage and some (not all) over-voltage cases. But
>>>>>> I'd
>>>>>> rather have the TVS fail shorted, than blow up everything downstream.
>>>>>>
>>>>>> TVS shorted can be blamed on the customer!
>>>>>>
>>>>>> Bulletproof startup can be challenging.
>>>>>>
>>>>>> We hard-ground everything in our boxes and assume that a customer
>>>>>> might want to power us from their, usually grounded, roughly 24 volt
>>>>>> DC buss.
>>>>>
>>>>> We often do that too, and used to do it more when we could still get
>>>>> PolyZens, which were a wonderfully complete and compact solution
>>>>> (*sniff* *sniff*).
>>>>>
>>>>> A big TVS can desolder itself and fall off the board if the PCB is
>>>>> vertical.
>>>>>
>>>>> Most of our stuff has switchers and lots of filtering, and so runs
>>>>> fine
>>>>> off a common power buss. The rail splitter thing is for light-duty
>>>>> use.
>>>>>
>>>>> Cheers
>>>>>
>>>>> Phil Hobbs
>>>>
>>>> Take a look at IXYS CPC1540GS.
>>>>
>>>> It's a high-voltage bidirectional SSR with current and thermal
>>>> limiting.
>>>>
>>>> I've used it as just a current limiter. This and a TVS might be a nice
>>>> combination. Drive the LED side with a resistor or a depletion fet.
>>>>
>>>> Some clever LED-side driver might do under/overvoltage lockout too.
>>>>
>>>
>>> Nice part, but its maximum Ron of 25 ohms is on the high side.
>
>>
>> It's 4 ohms in unipolar mode, which is better but doesn't do reverse
>> protection the obvious way.
>>
>> I want a higher-power version.
>>
>> Consider, maybe, a biggish SSR and a small ssr or optocoupler to
>> measure the ON voltage drop for shutdown.
>>
>
> Nah, I'll stick with 70 cents worth of small FETs and a resistor pack
> for the grounded-wart fault condition, and let the polyfuse look after
> overcurrent. The TCA0372 will be pretty much loafing at current levels
> I care about for this use.
>
> The FETs would be cheaper still except that I need >24 V_GSmax--for
> PFETs, I wound up with DMP3056es for all three, and for NFETs, DMG3406L
> pass devices and a MCC 2N7002A driver.
We just got the first batch of ten rail splitter boards in from JLCPCB.
<https://electrooptical.net/www/sed/wallwartsplitter.pdf>
They work great--if you short either side of the wart to ground, the
FETs open up and latch that way until you cycle the power. It's also
polarity-protected, of course.
These ones get clamped to a metal baseplate with a thermal gap pad to
cool the TCA0372.
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.nethttp://hobbs-eo.com
Reply by Anthony William Sloman●February 14, 20232023-02-14
On Tuesday, February 7, 2023 at 1:33:01 AM UTC+11, Phil Hobbs wrote:
> On 2023-02-06 01:47, Jan Panteltje wrote:
> > On a sunny day (Sun, 5 Feb 2023 16:42:49 -0500) it happened Phil Hobbs <pcdhSpamM...@electrooptical.net> wrote in <c5e52388-6aff-79e8...@electrooptical.net>:
<snip>
> > potcores do not radiate much.
> >
> We build some things with ~ 2 MHz switchers inside, to keep the spurs
> out of band. They're a pain, though, because they can do unexpected
> things such as exciting unexpected PCB resonances in the hundreds of
> megahertz. Hobbyist approaches such as hand-winding potcores are fun
> the first couple of times, but get seriously old when you have lots of
> products to support with very limited manpower. They're also physically
> large, and have to be soldered manually.
Pot cores aren't produced in high volume for the hobbyist market.
There are people who will wind your pot core and RM core formers for you. They tend to be small local shops, well adapted to your scale of business.
People who are serious about using ferrite-cored transformers have been using printed windings for at least a decade now, and there are core pairs around designed to clamp onto a printed circuit board. Find a printed circuit board manufacturer who can print thick copper onto thin laminate so you can can get a respectable fill factor for your windings.
https://product.tdk.com/system/files/dam/doc/product/ferrite/ferrite/ferrite-core/catalog/ferrite_mz_sw_planar_en.pdf
John Larkin doesn't seem to know anything about this kind of transformer, nor much about more old-fashioned parts either. They do seem to make him nervous.
--
Bill Sloman. Sydney