Simplistic Mosfet HV Shunt Regs - Page 13 - diyAudio
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Old 15th February 2009, 10:59 AM   #121
Salas is online now Salas  Greece
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Milen:

They look OK for the moderate cuurent and voltage difference you gonna use. Put thermal grease for the surfaces to contact well. The aluminum looks rough.
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Old 15th February 2009, 11:19 AM   #122
JC951t is offline JC951t  Taiwan
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Hi Gary,
You missed out Q1
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Old 15th February 2009, 02:44 PM   #123
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Quote:
Originally posted by salas
Milen:

They look OK for the moderate cuurent and voltage difference you gonna use. Put thermal grease for the surfaces to contact well. The aluminum looks rough.
hi Salas

yep the aluminium is rough. i cut them into half myself. lol. they are cheap. they small one on the back of the irfp9240 is just around 15cents.

thermal grease? does the drain of the mosfet need to be isolated from the heatsink?

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Originally posted by JC951t
Hi Gary,
You missed out Q1
i think its there on the top left conner. just not labelled. Gary?

erwin
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Old 15th February 2009, 02:49 PM   #124
Salas is online now Salas  Greece
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If the 2 Mosfet heatsinks are separate, and no one of them will ever touch ground, you can not isolate them, but if you touch them they will be on high voltage. Since there is always chance for an accident, I would highly recommend you use mica spacer pads and thermal grease, plus isolated screw for 840, 9240 normally has isolated screw eye. Best of luck with your project, let us know more when ready and listening.
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Old 12th March 2009, 09:23 PM   #125
Marinos is offline Marinos  Greece
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Hi salas,

I would like to try your regulator in a a low voltage triode line stage. The target voltage is 90 Volts.

Could this be done with simple changes to the schematic at post #2 or use the schematic as is and drop the voltage to 90 volts using an RC ?

Your advice will be much appreciated
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Old 12th March 2009, 10:06 PM   #126
Salas is online now Salas  Greece
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Quote:
Originally posted by Marinos
Hi salas,

I would like to try your regulator in a a low voltage triode line stage. The target voltage is 90 Volts.

Could this be done with simple changes to the schematic at post #2 or use the schematic as is and drop the voltage to 90 volts using an RC ?

Your advice will be much appreciated
What is the bias current?
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Old 12th March 2009, 10:09 PM   #127
Marinos is offline Marinos  Greece
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55 ma aprox. for both channels
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Old 12th March 2009, 10:15 PM   #128
Salas is online now Salas  Greece
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Set the 100R trimmer at about half before firing the shunt up. After half an hour of thermal stabilization, set for 90V and forget. Happy listening.
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Old 12th March 2009, 10:18 PM   #129
Marinos is offline Marinos  Greece
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God you are fast... Thanks a lot
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Old 12th March 2009, 10:22 PM   #130
Salas is online now Salas  Greece
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No big deal. Let us know your impressions.
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