I am working on a board design which is very limited in space. I am taking input from a passive guitar pickup and sending it through a high impedance buffer op-amp, a low pass filter, and then a non-inverting op-amp. The final output is a cleaned up, half-wave rectified, and amplified version of the original signal. This signal will be measured by the ADC of an Arduino, which will use the intensity of the received signal to do some things.
At no point will the signal go to a speaker, and I do not care at all about the tonal quality of any audio signal.
From my research, I have read that film capacitors are best for audio DC blocking applications. In this case this is capacitors C9 and C10. As space is limited, I'd like to use a different type of capacitor since film capacitors are quite large.
Since I don't care about the quality of the audio in any way, is it acceptable to use a non-film capacitor? If so, which type of capacitor would be a good space-saving alternative?
Edit: I should probably mention the caps in question (C9 and C10) are 1uF.