This simple transistor tester was found in a Japanese magazine in 1967. It tests general purpose transistors of both the NPN and PNP type and is powered by 4 batteries (6 V).
a This circuit was obtained from a 1978 Practical Wireless. It causes a low-power 1.5V lamp to...
This game consists of a variation of the Nerve-Test with the difference that errors are indicated...
This Power supply is intended to Power small loads with currents up to 30 mA. The voltage depends...