[sdiy] Weird Prodigy problem

Louis van Dompselaar louis at dompselaar.org
Tue May 3 14:05:33 CEST 2011


I have to correct myself.  Yes, -12V isn't affected but that's because the 79M12 seems to catch it.
Voltage does drop *before* the regulator.  In fact, it does so even before the recifier diodes.
The whole sine wave shrinks and moves on my scope.

Can a bad transformer cause this?  I will try with another one just to be sure.

> -12V is okay by the way, so whatever is causing it is shorting between +12V and ground.



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