This is the circuit of a MW commercial radio obtained in a 1967 publication. The transistors are made of germanium and are powered by 4 common batteries.
With the circuit shown in the figure, it is possible to connect or disconnect a load controlled by the...
This immobilizer circuit for the car was found in the Radio Electronics magazine of December 1976....
This fast converter using operational was found in a 70s American documentation. The circuit can be...