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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Signal generator (CB23891E)
Integrated signal generator appeared in Radio Electronics magazine in January 1968. The integrated...
Crystal Oscillator 4001 (CB25026E)
This is another one of the crystal oscillator configurations with the 4001. Many of them are on...
20 W per channel Amplifier (CB18512E)
In the figure we have one of the channels and the source of a good stereo amplifier of 20 W per...