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 high current power supply (supply2.asp)

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Perryb Posted - Nov 25 2011 : 9:51:27 PM
I built the circuit to output 100v. dc. I used a pot for R1 and a 100v zener diode for D1. When I load circuit, I burn the pot and short the zener. Can you tell me what I did wrong and how to correct it? I want to output up to 2 amps.
Perry
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audioguru Posted - Nov 26 2011 : 08:07:05 AM
The circuit is designed for an output of about 6V to 24V, not 100V. Its max output current is about 0.5A to 1A, not 2A.

You should never connect a pot in series with a zener diode because when it is turned to a low resistance then the current in the pot and in the zener diode is much too high and they burn up.

Maybe when you loaded the circuit the transistor had avalanche breakdown because the voltage is too high for it. Then its very high breakdown current went into the zener diode and destroyed it.

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