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 tunnel diode circuit was found in American documentation from 1966. The tunnel diode is the...
This simple blinker for incandescent lamp was obtained from an English documentation. The power...
This circuit is ideal for the design of interfaces and shields, as it allows total isolation of...