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).
This multivibrator with the 4001 was found in the November 1974 Radio Electronics magazine. The...
This soft start circuit was found in a 1965 General Electric documentation. The SCR and bridge...
This circuit was found in Japanese documentation from the 1960s. The coil must be 4 mH and the...