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 is the receiver circuit for the previous transmitter. The range of the system can reach 100...
In this game, whoever tightens the sensors, which are metal bars or spent batteries, makes the...
This circuit is from an ancient American documentation. The T-Bridge circuit determines the...