Transistor Test (CB23589E)

This small general purpose and RF transistor tester appeared in a February 1958 Radio Electronics magazine. The circuit is powered by a 4 V battery.

Divider by 4 320 000 (CB12304E)
This circuit, obtained from ancient English documentation, produces a pulse every 24 hours when a 50...
Pulse Counter (CB18676E)
This digital pulse counter offers an LED indication. Its maximum frequency is of the order of 5...
Sine to Square Converter (CB4131E)
This circuit was found in an old RF documentation. The circuit cuts out the incoming sinusoidal...