/diy/ - Do It Yourself

>>2027275
That circuit is not even close to right. What you want is something called a peak detector.

The diode allows the input (on the left) to charge the capacitor quickly when it's at a higher voltage than the capacitor. The capacitor can only lose voltage slowly through the resistor. Imagine it like the audio waveform is a set of mountains you can run up then hangglide over the valleys between them.

An OP-amp buffer is needed on the output in most applications. Without that whatever you're connecting to acts as another resistor and changes the discharge speed.