Synchronized AC switch (CB9261E)

Found in a 1965 General Electric circuit manual, this circuit uses SCRs from that time. Modern equivalents according to the power can be used.

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Gas and Steam Detector (CB6364E)
Found in an American 1980s documentation, this circuit makes use of a sensor of the era uncommon...
Shield triggered by oscillator (CB8516E)
This interesting configuration of optical triggering using an oscillator was found in a 90s...
JFET Headphone Amplifier (CB25567E)
This headphone amplifier has good gain and high input impedance. The circuit is from Electronics Now and...