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RE: use a spectrum analyzer ...

A spectrum analyzer will show 60 cycle (AC hum) and 120 cycle (PS ripple) in relation to a typical test signal ( usually a 1KHz sine ).

I playing around with my RH test amp last night and noted that the 60 cycle hum was down about 75dB or so from the test signal.

120 cycle ripple would go down by adding more PS filtering.

It is easier to see if a circuit change is meaningful or not with something visual to look at like a graph in real time.



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