Multipurpose temperature control (CB21368E)

This circuit was found in a 1967 RCA SCR manual. It uses period components that can be replaced with modern equivalents.

High Side Drivers PWM controller (CB15567E)
The circuit shown in figure 8 is an application suggestion for ISL8107, a new integrated circuit from...
Audio Oscillator (CB21907E)
This blocking oscillator that appears elsewhere on this site from other sources, was found in a...
Four Transistors Reflex Receiver (CB18301E)
This is a diagram of a 1958 commercial receiver. The circuit was found in documentation at the...