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.
In the figure we have a practical circuit for use with a magnetic transducer. The 20 M ohms...
Based on the well-known LM3909, this LED pulser circuit was found in American documentation from...
This circuit was found in old documentation but uses components that are still common. The circuit...