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DiscoverCircuits.com -- Hobby Corner
Last Updated on:
Tuesday, November 29, 2011 08:14 PM
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More
Control Circuits
Motor Control Circuits
PWM Circuits |
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PWM Circuit for Motor Speed
Control
designed by David Johnson, P.E. |
| Sometimes you want to
slow down a brush type DC motor. The most efficient way to do this is with a pulse
width modulation (PWM) technique. The hobby circuit below can operate from about 3
volts to 15 volts. The frequency is fixed at about 2KHz but the pulse width can be
varied from nearly 100% to 0%. |
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By using a
multi-turn pot, you can accurately select the desired motor speed. With the components
indicated, the peak motor current can be about 2 amps. For higher currents, you
will have to use an n-channel FET with a lower drain to source resistance.
(NOTE: This schematic was corrected 09/09/09) |
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Click on Drawing Below to view PDF version of Schematic |
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