Simplistic Mosfet HV Shunt Regs - Page 388 - diyAudio
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Old 15th April 2013, 12:53 AM   #3871
JBLman is offline JBLman  United States
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Thank you!
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Old 18th April 2013, 12:47 AM   #3872
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Default Mosfet ripple filter

HI.
I built a 572b amp the out put transformer was so big could not fit a choke to the box.
Does not have any hum even on 100+db horns but I would like to fit a mosfet regulator/ ripple filter.just for the driver tubes about 40-50 ma
I found the circuit for a mosfet ripple filter in AudioXpress Jan 2001 for a 3cx300 amp. circuit attached.
3cx300 amp runs at 450 volts about 240ma; mosfet only drops a few volts. i have 630 volts.
Do you think this circuit would handle 630 volts at 60ma; I have a irfc60 and some 200 volts 5 watt zeners. Would any one have a pcb for this circuit?
Thanks
Phil
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Old 19th April 2013, 05:45 AM   #3873
Salas is offline Salas  Greece
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Its a series design that its dissipation is going to be what voltage is across the IRFPC times the current it passes obviously but I don't think anybody has shown it in this thread before so to expertly tell you if it scales well or needs some modification.
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Old 19th April 2013, 10:35 AM   #3874
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Thanks Salas;
I will try it and see what happens.
Phil
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Old 3rd May 2013, 04:49 PM   #3875
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Salas I can only get regulated 28VDC, the red LED lits, any suggestions where to start? could be Q6 SK117GR?

TIA
Felipe
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Old 3rd May 2013, 04:55 PM   #3876
Salas is offline Salas  Greece
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That, the near Zener, and the BJT pair.
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Old 3rd May 2013, 05:00 PM   #3877
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Yes.
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Old 3rd May 2013, 05:24 PM   #3878
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DCA55 say SK117GR faulty component
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Old 3rd May 2013, 06:11 PM   #3879
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Q5 KSA1381 also faulty componentnow is working OK again
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Old 3rd May 2013, 08:53 PM   #3880
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Salas,
May order some custom transformers in my Primrose Gb for this amp and was wandering if dual transformers was necessary for dual regs, and if not, what VA rating shoulf the single transformer be. I was thinking single 800VA or dual 400VA.
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