Transistor Tester (CB21956E)

This transistor tester was found in a publication by Gernsback from 1960. The circuit can be used with current transistors.

High Voltage Inverter (CB25669E)
For experiments with ionization chambers and Geiger valves this circuit generates high voltage from...
Simple DC Motor Control (2) (CB11600E)
This control allows to start or stop a motor up to 3 or 4 A with a low intensity signal. The...
Solar beacon (CB20489E)
The battery is charged by the photocell that keeps the low consumption beacon in the dark. The...