Simplistic Mosfet HV Shunt Regs - Page 223 - diyAudio
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Old 26th December 2011, 05:42 AM   #2221
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I try to use small sinks just try to get the board into the amp box...seems not quite possible especially if I may use 1 board per channel in the future...just hope that this board with remote sensing, I can get by with putting the board in the PSU box (with about 0.5 meter wires connecting) without too much negative...
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Old 26th December 2011, 06:25 AM   #2222
vgeorge is offline vgeorge  Greece
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Seems you have to adjust your SSHV2 for two channels at 70mA then.
Maybe you could use the chassis as a sink for the 840, in order to save space inside?
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Old 26th December 2011, 09:39 AM   #2223
AndrewT is offline AndrewT  Scotland
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What voltage is on the drain of these high voltage FETs?
The backplate of these FETs are able to be touched and prodded and wires dropped on etc.
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Old 26th December 2011, 10:38 AM   #2224
vgeorge is offline vgeorge  Greece
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The first fet drain is at Vin.
I didn' t took temperature readings, but with 50mA and 200V there was no problem touching the sink for extended period.
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Old 26th December 2011, 11:50 AM   #2225
AndrewT is offline AndrewT  Scotland
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With 200V on the drain and the drain being within the thickness of the electrical isolator of the heatsink, be very careful about where you put tools and fingers.
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Old 27th December 2011, 02:27 AM   #2226
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should we use two pieces of the isolator for high voltage??
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Old 27th December 2011, 10:11 AM   #2227
AndrewT is offline AndrewT  Scotland
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The high voltage of itself is not a problem.
It's the accidental shorting of the copper backplate to anything at a different voltage that is the problem. Extra insulators cannot cure that.
The screwdriver tip will still span the gap from backplate to heatsink. The Finger can still touch the 200V.
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Old 27th December 2011, 02:23 PM   #2228
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Plastic devices are the best choice here.
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Old 27th December 2011, 02:59 PM   #2229
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Quote:
Originally Posted by luvdunhill View Post
Plastic devices are the best choice here.
Luvdunhill, what are you refering to - caps or insulators?
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Old 27th December 2011, 04:11 PM   #2230
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Transistors.
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