Heterodyne Mixer (CB4291E)

This is a typical 80's FM radio mixer circuit. The circuit was found in a documentation of the time.

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Spring Line Delayed Reverb (CB5969E)
This circuit makes use of a mechanical delay line to produce the reverberation effect. This is a...
Night light (CB6859E)
This circuit emits a warning sound when night falls. The circuit is from a Hands On Electronics from...
100 gain amplifier with LM381 (CB25272E)
We found this high gain circuit with the LM381 preamplifier in a Radio Electronics from February 1990....