Radio with amplifier (CB20486E)

We found this circuit in a publication of 1991. The audio amplifier is an operational that admits equivalent.

Infrared Transmitter (CB6370E)
This circuit was found in a Hands On Electronics with the suggested application an optical link for...
Headlight Time Relay (CB6378E)
This circuit is from an Electronics World of 1967. The circuit slows down the activation of a...
10 MHz Tuned Resonator Oscillator (CB6142E)
This circuit was found in a 1980s documentation for amateur radio. The circuit makes use of...