living,
I plan to use the earphone output as you say, Jim. But the circuit I
saw had some kind of splitter, fairly common I understand,
Since the output of the cassette machines will be rather high and you will
want to the volume up on the source machine you could use a number of say,
ten thousand ohm resistors, tied together at the source speaker end and one
for each recorder input. The grounds for all machines would be connected
together. The resistors will give you some isolation machine to machine and
reduce the level so it won't overload the mic input.
Jim
