Choosing Pull-Up Resistors and Capacitance for 555 Timer Bistable Motor Speed Control

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#1 21670378 11 Nov 2013 10:47

Saravan V Saravan V

Anonymous

Post #1
21670378 11 Nov 2013 10:47

I am a beginner to electrical engineering.
While setting up a circuit to control the speed of a motor using a 555 timer in bistable mode, I had some trouble deciding on the pull-up resistors, leakage resistance and leakage capacitance. The motor is rated 12V, 0.5A. Please advise on the values to be used.
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#2 21670379 11 Nov 2013 11:57

DAVID CUTHBERT DAVID CUTHBERT

Anonymous

Post #2
21670379 11 Nov 2013 11:57

A 555 timer IC cannot drive a 6 watt motor directly. A motor driver circuit is needed between the 555 and the motor.

A push-pull circuit consisting of two MOSFETs is an example of a motor driver.
#3 21670380 11 Nov 2013 13:12

Saravan V Saravan V

Anonymous

Post #3
21670380 11 Nov 2013 13:12

This is the suggested circuit. The output from the 555 goes to the base of the transistor.
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Choosing Pull-Up Resistors and Capacitance for 555 Timer Bistable Motor Speed Control

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