NPN and PNP transistor tester (CB22146E)

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

12 V Relay Drive Step with 6V Source (CB20433E)
With this circuit it is possible to activate a 12 V relay from a 6 V supply. The circuit operates as a...
Crowbar (CB6083E)
This circuit is from a 1980s Motorola documentation. The circuit can be set to fire from 60 to 120...
Robot controlled by a universal remote control (CB25322E)
This circuit is from a project published in the March 1996 Electronics Now magazine. The author used...