Noise issue with DIY variable PSU and audio amplifier
I have recently put together a regulated power supply unit along with a low power audio amplifier in the same enclosure and am using the same transformer for both circuits. The PSU works well and so does the audio amplifier, as long as the circuit I'm trying to power is not being powered by the same transformer. If I use the same transformer, I am getting a loud noise, which is not there when I use an external power supply I am not sure if there is a solution for this problem and whether this is an expected problem. Can someone please advise how to get rid of the noise issue. Thanks in advance.
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