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 circuit in a receiver that allows the capture of distant stations with short waves. The...
This simple circuit of low power with an LM386 includes the highly sensitive audio preamplifier...
This circuit is from old documentation but can be applied to modern equivalent components. The...