5 to 200 seconds timer (CB21401E)

This circuit was found in a 1967 RCA documentation. The semiconductor components are from the time, and modern equivalents can be tried.

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Audio Leveler (CB6481E)
This circuit was found in an Experimenters Handbook of the 1990s. The purpose of this circuit is to...
Variable Source (CB18169E)
This source, from a 1982 documentation, uses a triac to control the power and voltage applied to...
555 Duty Cycle Oscillator (CB24846E)
This circuit was found in the September 1984 issue of Radio Electronics magazine. The circuit has...