For those of you who picked up the 1976 edition of
'Hodder and Stoughton Basic Electronics - Vol. 6'.
Here is a passage:
“The S-DeC layout of the circuit, fig. J6.3, shows a one-way intercom; there is obviously no way that the listener can reply with this arrangement. However, if a two pole, two way switch of the type illustrated in fig. J6.4 is used, then either loudspeaker may be switched to the send or receive position; that is, terminals 1 of the switch could connect to the output terminals indicated in fig. J6.5. However, it is possible that both switches may be at send or receive, in which case the amplifier is by-passed. How do you overcome this?”
RC
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