Integrated FM Radio (CB14571E)

This circuit uses currently uncommon components, including the 10.7 MHz (FI) filter. This circuit was found in Motorola's 1990 Linear Databook.

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Hartley Crystal Oscillator (CB19354E)
This circuit can be used with crystals from 100 kHz to 30 MHz and the resonant circuit must be...
Zero Crossing Detector (CB13641E)
This circuit, found in a 1977 documentation, indicates when the grid voltage goes through zero....
Phase Control (CB6562E)
Employing a unijunction and a triac of the era, this 1964 Electronic Design circuit uses a diac to...