Please take a look at his old power supply schematic. I am getting the expected 12VDC on the collector of Q113. But in addition to that I get a 150mv sawtooth riding on the 12VDC. I assume that is not normal? What would be causing that?
In addition I am getting some noise off of the output of the 7805.
The supply is almost 40 years old and has never had the filter caps changed.
Here is the block diagram of the power supply.
In addition I am getting some noise off of the output of the 7805.
The supply is almost 40 years old and has never had the filter caps changed.
Here is the block diagram of the power supply.
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