42 kHz oscillator (CB21805E)

This circuit was used as an eraser for old tape recorders. The circuit is from a 1960 Mullard transistor manual.

Signal Compressor and Expander (CB20310E)
This circuit acts on the dynamic range of an audio signal, which can be useful for recording,...
Stepper Motor Control UCN4202 (CB4860E)
This is the conventional application of the UCN4202 to control a 12 V stepper motor with current...
10 V Transformerless Power Supply (CB23987E)
Described in the December 1969 Radio Electronics magazine, this circuit is intended to supply the...