This circuit was obtained in a 1967 Electronics World. The components are still common today, the SCRs can be replaced by equivalents and the unijunction transistors the 2N2646.
This circuit uses a switch to select the direction of rotation of a DC motor. It was found in the...
This direct-coupling three-transistor amplifier source some watts to a loudspeker when powered...
Rumble is a low-frequency oscillation that occurs in turntables due to variations in motor speed....