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Old 31st December 2011, 11:46 AM   #2341
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Your burn story has logical explanation then. What R1 value you use and what will be your real load current need?
R1 is 56ohm, my application is for a phono preamp using 250V and 55mA with CLC filtered output 300V
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Old 31st December 2011, 11:48 AM   #2342
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Merlin:
Vishay is good. You got it from a store or ebay?
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Old 31st December 2011, 11:50 AM   #2343
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Same ones. Was final testing the filament shunt regs and when completed, I plugged in the high tension umbilical cable. Just as I was inserting the the plug it dawned on me that the voltage would probably be too high for the parts. The sound, and smell confirmed my thinking. Lesson learned.
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Old 31st December 2011, 11:51 AM   #2344
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R1 is 56ohm, my application is for a phono preamp using 250V and 55mA with CLC filtered output 300V
What is the voltage across the 56 Ohm? Your 8K6 dummy draws 30mA @ 270V.
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Old 31st December 2011, 11:52 AM   #2345
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Merlin:
Vishay is good. You got it from a store or ebay?
I bought at RS on line by internet, fisical shop is in Barcelona 60Km aprox. of where I live, the other times I bought something never any trouble.

Can I replace irf9610 for irf9240, remove the heatsink for one biggest or left the same heatsink like used for irf9610
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Old 31st December 2011, 11:53 AM   #2346
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Originally Posted by SGregory View Post
Same ones. Was final testing the filament shunt regs and when completed, I plugged in the high tension umbilical cable. Just as I was inserting the the plug it dawned on me that the voltage would probably be too high for the parts. The sound, and smell confirmed my thinking. Lesson learned.
Bad move, and it was working fine all along, grief. What the heck, make it into SSHV2 is an opportunity.
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Old 31st December 2011, 11:56 AM   #2347
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merlin, did you hook up your LED's straight to the 9V battery without a current limiting resistor?
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Old 31st December 2011, 11:57 AM   #2348
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Quote:
Originally Posted by merlin el mago View Post
I bought at RS on line by internet, fisical shop is in Barcelona 60Km aprox. of where I live, the other times I bought something never any trouble.

Can I replace irf9610 for irf9240, remove the heatsink for one biggest or left the same heatsink like used for irf9610
Don't know more Merlin. Its the classic SSHV1 circuit as you know it. If executed OK, then it does not like something in that configuration that I can't understand from afar.
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Old 31st December 2011, 11:58 AM   #2349
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merlin, did you hook up your LED's straight to the 9V battery without a current limiting resistor?
Yes only one second to see if lits.
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Old 31st December 2011, 12:02 PM   #2350
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What is the voltage across the 56 Ohm? Your 8K6 dummy draws 30mA @ 270V.
The voltage across the 56ohm is 1.836V. confirm the load again is 262.6V with 8K6 dummy load.
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