Simplistic Mosfet HV Shunt Regs - Page 252 - diyAudio
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Old 9th January 2012, 12:44 AM   #2511
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Quote:
Originally Posted by Salas View Post
Very nice. I will try it out more later and I can include V3 calc with the SSHV1 evolution post linked from page 1 for everybody to can point to and have less questions. With your permission of course. Is that OK?
Of course that's OK!

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P.S. With the last included schematic ''current reference'' cells should read ''LEDS Voltage'' D1,D2,D3 to match I think. You also include a rectification & pre-filtering drops calculation section. Would be better to depict that front end example with a schematic too, so people will picture it better?
Yes, I'll try to do it tonight after work. Maybe you should wait till then before putting the link in the first page...? I'll post here once it's done.
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Old 9th January 2012, 12:46 AM   #2512
Salas is offline Salas  Greece
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Yep, will wait of course. No hurry.
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Old 9th January 2012, 08:04 AM   #2513
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Originally Posted by Salas View Post
TL783 is 125V max. You floated it I suppose for the B+ of that SRPP.
125V is the limit between Vin and Vout. B+ was 220V and floated.
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Old 10th January 2012, 12:11 PM   #2514
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Changed SK170BL & MJE350 with old tx works OK 260Vout

Next step I will try with Bartolucci tx to see what's happen
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Old 10th January 2012, 01:42 PM   #2515
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Default SSHV2 beta test

Another very successful best test for the SSHV2.
A few days ago, I received from Teabag one SSHV2 pcb to test. Quality is awesome as usual.
This morning got the last few parts missing and soldered it. Took less than two hours. Worked right away, no surprises. Current initially was on the low side, and it did not regulate properly. A few turns on the trimmer and everything was fine. Looks very stable, with minimal voltage drift. Of course, this can change inside a box.
Looks more bulletproof and more tolerant to mistakes than SSHV1.
Tried various Vin and Vout combinations on the high voltage side.
Current set a 55mA, but I have tested it up to 100mA.
Also heatsink for the 840 was a little oversized for testing. For the 10uF cap, I had to use two 20uF 250V in series, as I did not have anything else in my stash right now. Resistor was 17k.
Pic on the scope is AC full gain.

Many thanks to Salas and Teabag.
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Old 10th January 2012, 01:45 PM   #2516
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With Bartolucci tx also OK 260Vout 56mA
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Old 10th January 2012, 01:47 PM   #2517
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Quote:
Originally Posted by vgeorge View Post
Another very successful best test for the SSHV2.
A few days ago, I received from Teabag one SSHV2 pcb to test. Quality is awesome as usual.
This morning got the last few parts missing and soldered it. Took less than two hours. Worked right away, no surprises. Current initially was on the low side, and it did not regulate properly. A few turns on the trimmer and everything was fine. Looks very stable, with minimal voltage drift. Of course, this can change inside a box.
Looks more bulletproof and more tolerant to mistakes than SSHV1.
Tried various Vin and Vout combinations on the high voltage side.
Current set a 55mA, but I have tested it up to 100mA.
Also heatsink for the 840 was a little oversized for testing. For the 10uF cap, I had to use two 20uF 250V in series, as I did not have anything else in my stash right now. Resistor was 17k.
Pic on the scope is AC full gain.

Many thanks to Salas and Teabag.
That's a very good new, thanks George, Nick & Mike for your excellent work
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Old 10th January 2012, 01:51 PM   #2518
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High voltage stresses there and it went smooth. Good test job George.
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Old 10th January 2012, 01:51 PM   #2519
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Quote:
Originally Posted by merlin el mago View Post
With Bartolucci tx also OK 260Vout 56mA
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Old 10th January 2012, 01:54 PM   #2520
Salas is offline Salas  Greece
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Quote:
Originally Posted by merlin el mago View Post
That's a very good new, thanks George, Nick & Mike for your excellent work
Black proto group test board for the burns not to show much.
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