Simplistic Mosfet HV Shunt Regs - Page 373 - diyAudio
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Old 10th January 2013, 02:29 PM   #3721
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It is very strange but second salas work fine, they are the same.. 17K dummy load (15mA 260v) Tp set on 350mV.
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Old 10th January 2013, 02:42 PM   #3722
Salas is offline Salas  Greece
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Quote:
Originally Posted by rclourenco View Post
Hi Salas, wishes of happy new year.

I need your help if possible, yesterday working late and tired, I did a stupid mistake with one working SSHV2 board, I connected my meter probes set to measure on the 20A range, to the output of the board, wanting to measure voltage

Of course this produced a nice small flash on the terminals/probes, and the regulator stopped working. The led is still on, but now I get only around 6,4V on the output.

What I need is for you to tell me in your opinion what should be changed to avoid taking all transistors out.
Many thanks.
Check Vgs and Vbe on all semis to pinpoint broken ones.
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Old 10th January 2013, 02:48 PM   #3723
Salas is offline Salas  Greece
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Quote:
Originally Posted by bmxmen View Post
It is very strange but second salas work fine, they are the same.. 17K dummy load (15mA 260v) Tp set on 350mV.
Check the semis, look for little differences between your 2 executions. Cleaning, wiring, whatever you can observe. Can't tell much out of experience on boards I have no hands on knowledge of.
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Old 10th January 2013, 02:55 PM   #3724
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Probably R4 was broken. I will change R1,R11 and R4 and i will be good, mayby. The second salas works fine , allready for 25minutes.
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Old 10th January 2013, 03:06 PM   #3725
Salas is offline Salas  Greece
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Gate stopper should be on 840's pin, and avoid as much cable length as possible. Check if you got any fail in insulation to sinks in the non working one also.
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Old 10th January 2013, 03:12 PM   #3726
Salas is offline Salas  Greece
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P.S. I see MJE350s? Those are not usually fully in plastic and your silver mini sinks look touching. That would mean a short between collectors.
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Old 10th January 2013, 06:00 PM   #3727
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acetone (nail polish) , trichlorethylene, vodka
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Last edited by nicoch58; 10th January 2013 at 06:04 PM.
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Old 11th January 2013, 07:33 AM   #3728
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Thanks for a help, they are not mje350, they are ksa 1381, fully isolatet from sinck's. This is pasible that R4 was broken before I add power suply, When im measuring it it got still 500R( I haved use 500R) .
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Old 11th January 2013, 10:12 AM   #3729
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Ksa 1381 broken, dn2540 probably to
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Old 11th January 2013, 06:27 PM   #3730
Jogi is offline Jogi  Germany
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Salas,

I still owe you a picture of AZ1 with black meshies...

Shunt works fine now after replacing the semis altogether, very good sound with D3a phono/silk stepups, I raped PCB from Quanghao, and built it with different circuit.
Unfortunately my digicam broke, so no pics of the internals of the actual phono stage, only unfinished with SSHV1.
Enclosures are from fleamarket (5), little spray, mdf, veneer, some evenings spare time.

Sure enough I am going to put those regs everywhere possible, big upgrade everytime I use them.
BTW I bought a Peakatlas transistor tester, very useful to sort out the dead from the alive . Before I had to throw away the suspected semis , now I can check out the actual culprit and keep the healthy ones.
So thanks one more time for spending all this time here to help out those helpless guys fixing their burnt regs ...


cheers,

Juergen
Attached Images
File Type: jpg Kopie von P1010258.JPG (195.9 KB, 190 views)
File Type: jpg Phono innen alt.JPG (205.8 KB, 190 views)
File Type: jpg Phono und Netzteil.JPG (196.3 KB, 182 views)
File Type: jpg Phono Seite.JPG (199.2 KB, 174 views)
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