NPN and PNP transistor tester (CB22146E)

This simple transistor tester was found in old English documentation. Suitable for general purpose transistors.

0.1 to 90 second timer (CB10192E)
This simple circuit produces pulses delayed in times set by the resistor in series with C on the...
Ultrasonic Repeller (CB24760E)
This circuit was published in the Ideas section of Radio Electronics magazine in August 1983. The...
Sequential Remote Control (CB4296E)
In the figure we have the receiver of a sequential remote control operating at a frequency in the range of...