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 circuit can handle 25 A unde a 32 V voltage using a hight power old transistor. This...
This didactic circuit from a 1977 Radio Shack documentation shows how to use the 741 as a...
It can be obtained from Mouser Electronics new crystals for surface mounting from AVX with...