MicroMotor Controller

MicroMotor Controller - simultaneously When switch S2 is...

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CIRCUIT IDEAS ELECTRONICS FOR YOU • APRIL 2005 6 3 W W W . E F Y M A G . C O M U sing this circuit, you can con- trol the rotation of a DC micromotor simply by press- ing two push-to-on switches momen- tarily. The circuit is built around two NE555 ICs (IC1 and IC2) and a quad- NAND IC CD4011 (comprising NAND gates N1 through N4). The NE555 ICs (IC1 and IC2) are configured as invert- ing buffers. IC CD4011 (IC3) NAND gates are configured as bistable flip- flop. The DC motor to be controlled is V. DAVID MICROMOTOR CONTROLLER SUNIL KUMAR connected between the outputs (pin 3) of IC1 and IC2. Closing switch S5 provides power to the circuit. Now, when you press switch S1 momentarily, pin 10 of IC3 goes high, while its pin 11 goes low. Since pin 10 of IC3 is connected to reset pin 4 of IC1 and IC2, the high output at
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Unformatted text preview: simultaneously. When switch S2 is pressed, pin 10 of IC3 goes low, while its pin 11 goes high. The low logic at pin 10 disables both IC1 and IC2. Switches S3 and S4 are used for forward and reverse motion of the mo-tor in conjunction with switch S1. If you press switch S3 after pressing switch S1, pin 3 of IC3 goes high, while its pin 4 goes low. The motor now starts rotating in the forward direction. However, if you press switch S4 after pressing switch S1, the motor will ro-tate in reverse direction. Note. The complete kit of this cir-cuit can be obtained from Kits‘n’Spares, 303, Dohil Chambers, 46, Nehru Place, New Delhi 110019; Phone: 011-26430523, 26449577; Website: www.kitsnspares.com; E-mail: [email protected] z...
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