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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transistorized differential amplifier (CB25639E)
This circuit uses matched transistors. The circuit is from Electronics Now magazine and has a...
Rhytmic Lamp AC and 12 V (CB422)
In this circuit a 12 V lamp or LED blinks with the music signal applied to the input. R depends on...
120 V x 40 W x 400 Hz inverter (CB7271E)
This circuit was obtained in Motorola documentation from 1969. The components are from that time. In...