NE602 Converter (CB25304E)

This circuit converts signals from the longwave band of 350 kHz to 500 kHz to 4.35 to 5MHz. The circuit is from a Radio Electronics from April 1990.

Fast Current Sensor with Alarm (CB5255E)
This circuit produces a warning signal with the programmed current that can reach 4 A. The circuit is...
Pulse Generator (CB883E)
This circuit open and close the relay in intervals adjusted by the potentiometers. The capacitors...
Tone Modulated Radio Control Transmitter (CB500)
The range for this transmitter is up to 100 m. The signal can be received by any circuit tuned for the...