Re: So I've bought a pair of red BT intercom phones...
Very nice.
I've got one in grey but I incomplete.
It's a 4-wire connection, and turning the dial in one causes the dial-off-normal springs to make a circuit sounding the DC buzzer in the other.
Hopefully they haven't been further modified so just joining the line cords matching colour to colour will get it working.
Mine has a jack on the back to connect an external 9v power supply. Sadly mine is disconnected from the PCB so I don't know where the battery connects in the circuit.
The bellmotor in mine is missing. And no internal diagram.
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