Re: Audio Buzzing
WA6PXC Rich <sigma@...>
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I have also had a buzzing noise in my audio.
I use a Nextion 5" screen. It was powered from the common LM 7805 5 volt supply
which is mounted to the radio chassis for a heat sink. I substituted an isolated 5 v supply
and the buzzing went away! To solve the problem, I placed a 1 watt 4.7 ohm resistor between the
13.8 volt supply and the input to the 7805, then placed a 470 uf 25 volt cap from the junction
of the 4.7 ohm resistor and the 7805 input to ground..Not a hint of buzzing now!