Phase selector for remote control (CB9265E)

Found in a 1965 Electronic Design, this circuit makes it possible to select signals with an inverted phase using a relay and a unit gain stage.

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Symmetrical Adjustable Power Supply (CB1210E )
With this circuit, from a 1991 publication, it is possible to regulate the output of a symmetric source...
LM3600 Amplitude Modulator (CB25146E)
This circuit was found in the July 1988 issue of Radio Electronics magazine. It makes use of an...
Frequency amplifier (CB6974E)
Found in an old Radio Electronics, this circuit applies to frequency meters for frequencies up to 100 MHz....