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.
This configuration was found in an old technical documentation from the 70s, but it can be...
In the figure we have a converter that generates a negative voltage from a positive voltage...
This circuit was found in a 1976 magazine. The circuit emits a sound when a balance sensor placed on...