Band Switch (CB21254E)

This switch or band selector for receivers was found in a Popular Electronics from the 1990s. The circuit uses a PIN diode.

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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...