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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Field Strength Meter (CB6539E)
Found on an 80's Elektor, this circuit uses common components, being the diode a general purpose...
Pulse extender (CB7255E)
This logic gate that increases the duration of input pulses was found in a NASA documentation from 1966....
Constant current pulse generator (CB7879E)
Found in a 1965 Electronic Design, this circuit generates adjustable pulses between 200 uA and 10...