audioguru Posted May 1, 2004 Report Posted May 1, 2004 Kevin,Sorry to correct you again, but the zener gets its current through R3 from the unregulated input on the left, not the regulated output on the right. Quote
Kevin Weddle Posted May 1, 2004 Report Posted May 1, 2004 The circuit I have gets it's zener voltage from the output. It is a commercial power supply. Quote
MP Posted May 2, 2004 Report Posted May 2, 2004 The correct way to use a zener for voltage regulation is to pass the voltage through a resistor first, then to the zener. This is learned in first year basic DC electronics. Of course the zener got hot.MP Quote
Guest Posted May 2, 2004 Report Posted May 2, 2004 Kevin it would be nice if you post your circuit here. Quote
MP Posted May 2, 2004 Report Posted May 2, 2004 That was probably confusing... my last post was in response to reply# 21. I should have used the quote.MP Quote
Kevin Weddle Posted May 2, 2004 Report Posted May 2, 2004 From my circuit, which is similar to Siddharths, the input signal is drowned out by a capacitor and the zener gets it's voltage from the ouput through a resistor. Interestingly enough, the voltage of the darlington is high, making the current low. The rated current is 1.5A. I understand the current should be at the midpoint. Also, my circuit doesn't have a pass transistor, it's a regulator. Quote
Guest Posted May 3, 2004 Report Posted May 3, 2004 Kevin its hard to imagine your circuit.Can you put it up? Quote
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