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.
This circuit uses integrated 555 and an amplification step with transistors, as we can see in the...
This circuit uses components that are still common despite being from 1995 documentation. The circuit can...
This circuit was obtained from American documentation from the 1990s. The transformer can be a car...