Simplistic Mosfet HV Shunt Regs - Page 233 - diyAudio
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Old 30th December 2011, 07:50 PM   #2321
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Quote:
Originally Posted by vgeorge View Post
Have you taken out and measure ALL the semiconductors and make sure they are OK? Do that before next try.
I changed all semis
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Old 30th December 2011, 07:52 PM   #2322
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Solder the Vin cables directly under Vin capacitor electrolytic.
I have to change all LEDs, once changed & Vin cables soldered directly to 150uF input cap, can I fire up?
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Old 30th December 2011, 07:59 PM   #2323
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Then if everything is fresh, fets insulated from sink, there must be a short somewhere in the board. Clean and check. Maybe check continuity of output to ground. It shouldn' t be short.
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Old 30th December 2011, 08:07 PM   #2324
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Originally Posted by vgeorge View Post
Then if everything is fresh, fets insulated from sink, there must be a short somewhere in the board. Clean and check. Maybe check continuity of output to ground. It shouldn' t be short.
No continuity at the output. Thanks for help George
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Old 30th December 2011, 08:55 PM   #2325
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The orientation of all SS devices should be double and triple checked. Also the value and Ohmic resistance of all resistors should be double and triple checked. Once both the above are correct and there are no short circuits on the PCB, the regulator should work fine. "Haste makes waste".
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Old 30th December 2011, 09:21 PM   #2326
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Originally Posted by merlin el mago View Post
I have to change all LEDs, once changed & Vin cables soldered directly to 150uF input cap, can I fire up?
Done, I have to do something more or can I fire up?
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Old 30th December 2011, 09:24 PM   #2327
Salas is offline Salas  Greece
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If you also checked continuity you mentioned and no shorts on board's tracks give it another quick careful go.
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Old 30th December 2011, 09:38 PM   #2328
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This time only burned all LED's, now I will solder all LEDs fisically like p2p

Last edited by merlin el mago; 30th December 2011 at 09:41 PM.
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Old 30th December 2011, 09:42 PM   #2329
Salas is offline Salas  Greece
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Abort. Have a wine, sleep, clean you head. HV is dangerous when frustrated. You will look very carefully into all details again soon.
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Old 30th December 2011, 09:48 PM   #2330
iko is offline iko  Canada
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Yes, best to take a break. Check everything with a fresh mind some other time. Check the pcb carefully for possible trace shorts via solder. Take all parts out and start anew. Also make sure you give it filtered DC from a trusted source. I suggest you use some zener diodes to protect the mosfets.
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