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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Audio Amplifier (CB4759E)
This 90's Radio Electronics circuit uses uncommon integrated circuits today. The circuit is...
Voltage Controlled Oscillator (CB4022E)
The integrated circuit used in this configuration of the 1990 Motorola Linear Databook is not...
Regulation of 0.005% (CB1538E )
This circuit, from an American publication of 1974, provides a 0.005% regulation with a variation of...