audioguru Posted September 16, 2011 Report Share Posted September 16, 2011 With this hum, you mean just noise, or it has impact on quality of output?When the output of a "regulated" power supply has hum (100Hz in Europe or 120Hz in North America) then it indicates that the output is saturated and is not regulating the voltage.The voltage changes of the AC input (including noise) and the ripple of the filtered rectifier are simply passed to the output. The output voltage will also change with load current changes. Quote Link to comment Share on other sites More sharing options...
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