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Here goes: The amplifiers and xor act as the phase detector, the capacitor in the center acts as the low pass filter, and the 555 timer acts as the VCO. The amplifiers at the right end simply amplify, invert, and shift the demodulated signal so that it centers near zero volts, goes high for higher frequency signals, and goes low for lower frequencies. The capture frequencies are around 650kHz and 550kHz. The frequencies can deviate further, but that risks going out of range from the lock on frequencies.
Adjust the frequency of the blue signal and watch the demodulation happen on the orange signal. :)
Tips and advice are well appreciated if you have any!
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