what is the purpose of these components?

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Hi

15mH in parallel with 0.001uF act as a LC bandpass filter which center frequency is f=1/(2*PI*SQRT(L*C)).

470pF is needed to add the AC signal (conning from the photodiode) to the DC component fixed at 74c14 input pin 1 by the two 4.7M resistors. This DC value is 1,5V at 74C14 input is. This 74C14 gate act probabely as an AC amplifier and not as a digital gate, due to input polarization at 1.5V

220uF purpose is to filter DC power supply and to be a short circuit for AC signals.
 

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