Electronics > Projects, Designs, and Technical Stuff

Military Microphone Amplifier - Amazing Old Tech

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StillTrying:

--- Quote from: willeye on June 22, 2020, 05:26:37 pm ---As this is the first thing i have reversed it is more difficult than i thought :)
--- End quote ---

I hate doing it, but that looks quite simple.
I'd start by drawing three separate diagrams of the 3 op amp's 8 pins and the components connected to them, by the time you've done that you should notice some places where the 3 op amp diagrams connect to each other, and then can draw a full diagram from the 3 partial ones.

magic:
Yeah, it's a trivial circuit :-//

The mic input part is a standard four resistor + opamp differential stage, with a discrete input stage added to the LM301 externally.
Haven't looked what the other input and its signal path is doing but it can't be much more complex than that. The third amp probably combines the outputs of the first two in some way.

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