Looking at the signals on C1 and C2 to me they look the same, with just the signal at the sound detector attenuated some. How important is the DC offset for each of these? Would it work to splice in the same amplified video signal from the op-amp to C1 but then include a dropping resistor to connect to C2? Is there a need for coupling capacitors between these?
Here is what I measured:
- C1: 0.23 VAC
- C1: -2.98 VDC
- C2: 0.10 VAC
- C2: -1.14 VDC
Also the scope traces look like the waveforms are the same:
