Found in an American publication from 1968, this circuit aims to keep the torque of a DC motor constant. The power transistor depends on the motor.
The flashing LEDs in this circuit simulate a working alarm and can serve as a deterrent to a...
This circuit is from an April 2000 Poptronics. The magazine no longer exists, but the circuit can...
Found in a Popular Electronics from the 90s, this circuit presents the difficulty of obtaining the...