A circuit diagram of a driving motor using a variable DC source. When using a PWM source, the circuit sees Ohmic resistance and inductance due to frequent switching.

This is a very cool electronic project to control dc loads using a very cheap and reliable design. This video also explains ...

You should mount the circuit of Q 2 as near as possible to the motor to reduce the series resistance of the wiring. This parasitic resistance limits the braking current and, thus, the deceleration.

This dc motor speed-control circuit uses standard, available components; light impinging on two independent phototransistors establishes the motor's speed. Motor speed can be adjusted by the light ...