Electronics student here, so i'm printing a IR receiver for a project of my school. I'm trying to understand the filtering part of the circuit.
The signal is received through the BP104 photodiode and then passes in a filtering/amplifying part of the circuit to be decoded then by a LMC567 tone decoder. Here's the schematic:
So far this is what I know :
Q1, Q2, Q3 and Q5 are Darlington pairs, to amplify the signal.
My questions are :
C2 and C3 would be low pass filters ?
What is the purpose of R11/C7, R7/C5 and C11/R14 ?
Any help would be appreciated.