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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Shaver adapter (CB9953E)
This circuit allows 220 / 240V shavers to be used in the 110V network. The diodes can be general...
1 kHz Bandpass Filter (CB24388E)
Found in July 1975, Radio Electronics magazine this circuit can use any operating circuit,...
Darlington Conventional Optocoupler (CB13063E)
Here we have in the figure the configuration of the circuit as a conventional Darlington. In this...