Using some LM358 op-amps to do a "precision rectifier" circuit with this little VU meter board I got. Basically gets rid of the voltage drop caused by the diode which rectifies the audio signal into DC (so that it can actually display it without needing to be incredibly loud).
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Going to test it a bit more tomorrow and try to measure the ripple on the outputs if I can and then this will become part of my next headphone amp for some fun lighting