Phone Call Amplifier (CB21271E)

This circuit was found in an old Electronics Now. The transistors are general- purpose and the circuit is powered by an external source.

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Astable MC3301 (CB6355E)
This circuit was suggested by Motorola in 1980s documentation. The circuit employs an operational of...
100 kHz Calibrator (CB3923E)
This simple calibration circuit consists of a crystal oscillator that generates an accurate 100 kHz...
Quadrature Generator for Transistor and SCR Testing (CB3807E)
Quadrature Generator for Transistor and SCR Testing This circuit was found in US 1980s...