This circuit allows you to alter the speed from stopped to the extent possible from the engine through a potentiometer. Because it operates by pulse width modulation motor force is little affected even at minimum speeds.
The circuit is based on a NE555 integrated which generates a train of pulses needed to control the transistor, the pulse which drives the DC motor. The diode in parallel with the motor stops when power is removed, transistor burn. Components between the terminals 2, 6 and 7 of integrated oscillation frequency regulating circuit, and thus the engine speed. The transistor, with a good heat sink, can handle up to 75W of power.
Yoseph BUITRAGO ESS SECTION 2 CI 18257871
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