This motor speed control circuit uses only seven components to regulate the speed of a motor. Simple and very cheap to contruct. This circuit controls the speed of a motor from 0 to 50 % of its nominal power. Resistor R1 and potentiometer P1 divide the positive halfwave swing of the line voltage. During negative swings, the current is blocked by diodes D1 and D2 and the thyristor receives no triggering voltage. The thyristor, in turn, cannot conduct current. But why can the circuit control onl
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