We found this circuit in a 1960 Radioarama magazine. The instrument tests common general-purpose transistors indicating their gain on a moving coil instrument. The loop serves to adjust the circuit.
The circuit we present was found in an English magazine from 1973. The complementary pair of power...
This circuit that equipped many transistor radios from the 50's was found in an American...
The circuit shown can be used on an infrared audio link. This circuit is from a Popular...