This circuit uses a common multimeter on the voltage scale. The calibration of the scale should be done based on transistors with known gains.
This counterphase circuit is from a 1973 publication, and can work with mains voltages or 12 V....
This simple transistor tester was found in a Japanese magazine in 1967. It tests general purpose...
This basic 100 kHz oscillator is suitable for use in calibration. We found it in documentation from the...