Triac Heating control (CB21372E)

We found this circuit in a 1966 RCA manual. The integrated circuit is unusual, and the Triac must match the load.

Remote control for antenna (CB25104E)
This is perhaps the first PIC project to appear in a publication. The article is from Radio...
Acoustic transmitter (CB8230E)
From a 90s Popular Electronics, this circuit emits pulsating signals for different types of...
CEM3330 Effects Circuit (CB24745E)
This circuit for effects on music synthesizers was found in the May 1983 issue of Radio...