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    0-30V Stabilized Power Supply

    Audioguru, I have replaced the power transistor (Q4), R7, Q1 and tested with a (just purchased) multimeter to see whether any of the capacitors are non operational but still no output from the power supply. I don't think any of these were blown but they seemed to be likely candidates, so...
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    0-30V Stabilized Power Supply

    Sorry - so far as I can see, my device uses the current circuit. I have built a few electronic devices but all of them have worked fine.  I would know how to test resistors, the transformer (which is working fine) and rectifiers but not sure how to test transistors.  How can I do that? Philip
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    0-30V Stabilized Power Supply

    I built this power supply a couple of years ago and have used it for a variety of tasks.  Tonight I was using it to try to run a 12v motor (around .5A) but the motor seems to have a problem (perhaps shorted) and now my power supply isn't supplying any power.  There is power to the board from the...
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