Audio amplifier 741 (CB20478E)

This low power audio amplifier was found at 1992s Popular Electronics. Transistors are general purpose common types.

455 kHz Oscillator (CB4240E)
This simple oscillator generates a 455 kHz signal. The circuit is from an 80's documentation and its...
TV Stereo Transmitter With Decoder (CB4643E)
This circuit is from 1994 documentation, serving the transmission of analog TV signals that will...
Variable Zener Diode (CB5875E)
This circuit was found in old documentation, but the transistor may be the modern equivalent BC547....