The circuit below has as an input a sound wave that is amplified (the op amp used is an ideal one) that then goes through a peak detector circuit. I intended to implement part of this circuit using breadboards but my problem is the capacitor C1 value.
With C1 equal to 1u (biggest capacitor I have) the output signal looks like this:
It doesn't really detect anything. What should I do if I don't capacitors with higher capacitance?
If C1 is equal to 3u:
It's better but not good enough. In the first 350ms the output signal is always 1.5V for some reason when it should be close to 1V or just following the peak values.
When C1 is 100u:
This one is the best so far but there is just one thing that annoys me is that the output seems to only follow the local maximum, when the input gets considerably lower the output just keeps whatever value it had before till the input surpasses that value.
This is from another circuit that I found:
The op amp from the peak detector is connected to Vcc.
The output of the peak detector appears to be more well behaved than mine, perhaps because the input signal has a bigger frequency? Anyway, that circuit still has a large capacitor value (50u) that I don't have.