This circuit uses a common multimeter on the voltage scale. The calibration of the scale should be done based on transistors with known gains.
DC motors from 6 to 12 volts and currents up to 2 amps can be controlled with this circuit. The TIP41...
This circuit was found in a publication of the year 1968. It uses complementary transistor to...
Found in ancient American documentation this circuit uses semiconductors from the thyristor family such as...