Above is a rough block diagram of our system. Essentially, the audio signal is processed through several op-amps, one at a time, to give it the phasing effect; along the way, the variable resistors are able to change the speed and depth of the phasing, as well as the feedback of the system. We are not entirely sure how this part of the circuit works; we think that the potentiometers for the speed and depth control four JFETs which feed into a series of op-amps (which may be filters), causing the amplitude to change at different speeds and depths. At the end, the system checks whether the switch has been pressed; if so, it will output the processed audio, and if not, it will output the raw input audio.
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