Quote:
Originally Posted by Sparks
BTW, what does a capacitor do anyway and why is one needed in this instance ?
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It's part of the receiver shunt-balance configuration for sidetone and transmission as far as I can make out, Sparks. There's an explanation on Bob's telephone page about the 706. It, and a resistor and a 1u8 capacitor are in parallel with the receiver and one of the induction-coil windings.
According to the blurb, capacitor tolerance of 15% is permitted so you could get away with a 1u cap, or, in reality, probably a 1u8.