Touch Switch (CB6449E)

This resistive sensor was found in a 1969 US documentation. The circuit uses transistors of the time, but current equivalents can be employed.

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Moisture Meter (CB23567E)
This circuit was published in Radio Electronics magazine in August 1958 which taught how to...
Bongo (CB6710E)
This percussion circuit was found in an Electronics World of 1968. The transistor may be general...
4060 Crystal Oscillator with Divider (CB4620E)
In the figure we have an interesting circuit for those with a project that requires a sub-multiple...