Touch on and off switch (CB9376E)

Found in RCA documentation from the 90s, this circuit uses integrated components from the time. The load depends on the triac.

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Audible pulse analyzer (CB7139E)
Found in an English documentation from the 90's, this circuit makes slow logical pulses audible,...
Acid rain monitor (CB7992E)
This circuit indicates when a rain is acidic by monitoring its pH. The circuit is from a 90s RE...
Sub Carrier Generator (CB4241E)
The basic purpose of this circuit is to apply an audio signal to a video carrier for sound and...