Quote:
Originally Posted by DMcMahon
There are 2 pairs of wires coming out of the transformer, one wire of one pair goes to the metal body of the transformer case and from there a black wire connects to earth, the other wire of that pair goes to the normally earthy side (but not earthed in this case) of the mic jack socket.
The first wire of the second pair goes to one of the 3 wires on the mic jack socket and the second wires goes to one of the 3 wires on the radio jack socket.
Bit confused why these mono jack sockets have 3 wires as well as an earth connection, the symbol in the schematic for these jack sockets does not help my confusion..
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The transformer looks to be connected as isolating, could be 1:1 or step up.
The jack switches.....looking at the schematic and your photo their contacts appear to open when a jack plug is inserted, prevents the two signal sources from being connected together, isolates the radio input resistor from the polarizing voltage output when a mic jack plug is inserted and keeps DC from the polarizing circuit off the radio line when a radio jack plug is inserted.
Lawrence.