Phone Patch (CB9398E)

This circuit was found in a 1969 CQ magazine. It is intended for coupling telephones to radio amateur equipment

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SCA signal decoder (CB9676E)
The SCA is a signal superimposed on the FM signals that make it possible to eliminate...
Relay isolator (CB8033E)
This shield circuit is from an American documentation from 1969. The components can be modified...
Low distortion oscillator (CB9200E)
This Wien bridge oscillator was found in a 90's EDN. The components are from that time and the...