Long maintenance circuit (CB8866E)

A 0 V signal initiates sampling on this circuit suggested by documentation from the 1970s. The integrated circuits used are uncommon today.

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Complete Timer (CB18775E)
This circuit has an LED indication of the timing progress, having been found in an old...
Infrared Vision (CB24310E)
This circuit is from a Radio Electronics magazine from August 1974. It used one of the first...
Nicad Automotive Charger (CB9538E)
This charger is powered by the car's 12 V socket, the number of diodes being calculated according to...