I would add a 0.1 uF cap to the output of your 78L05. I've had noise issues that affected the power supply, which in turn affected everything. A simple .1 ceramic cap fixed a multitude of gremlins.
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Re: PWM and audio noise
I would add a 0.1 uF cap to the output of your 78L05. I've had noise issues that affected the power supply, which in turn affected everything. A simple .1 ceramic cap fixed a multitude of gremlins.
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