Yup, the speaker was also the microphone.Does anyone happen to know how the old archer wired intercoms transmitted?
I don't see any kind of mic on the board.
I just replaced all the caps and have it working on the receive side of the master control, I can page with the buzzer but don't have voice transmit to the satellite units.
View attachment 115548
If your not transmitting voice audio but receiving it try cleaning the contacts in the talk/transmit switch.
Great bits is right! Such simplicity and reliability in a small package, well worth repairing.