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Motor Control Circuits   Page 1
Motor Controls:  #-B     C     D-G      H-L        M-O      P-R       S      T-Z

Last Updated on: Thursday, October 30, 2014 09:22 AM
 

Circuits Designed by Dave Johnson, P.E. :
  • 12V Cooling Fan Thermostat
    This circuit will turn on a 12v DC powered cooling fan when the air temperature reaches a certain high temperature and will keep the fan turned on until the temperature drops below a second lower level.  Both the high and low temperatures are both adjustable.  For ease of use, the temperatures are proportional to either degree F or degrees C, using an accurate electronic sensor.......
  • 555 Timer Forms Simple PWM Motor Controller
    Using a CMOS version of the 555 timer, this circuit can be used to control the speed of a motor by adjusting the duty cycle of the pulses sent to the motor.  (added 7/06)
  • Alternating CW & CCW Motor Driver 
    A while back a company needed a motor controller for a custom door latching system.  The system used a small brush motor with a speed reduction gear to both latch and unlatch the door.  When pulsed for about 250ms in the clockwise direction, the motor would unlatch the door.  When spun in the opposite direction for 250ms, it would latch the door. The circuit below performs this function.  A single low power pushbutton is used to alternate between the two directions.  The circuit is powered by 4.5v using a battery made from three alkaline AA cells.  The motor draws about 250ma. The battery should provide many years of service.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

µC Acts as Dedicated Motor-control -  09/11/98 EDN-Design Ideas....Motion-control systems often use a PWM signal to control the duty cycle for a motor….….Please scroll to find this circuit.… [Design Idea by [Dylan Horvath, Gecko Sysytems Inc, Austin, TX]
12V Cooling Fan Thermostat
This circuit will turn on a 12v DC powered cooling fan when the air temperature reaches a certain high temperature and will keep the fan turned on until the temperature drops below a second lower level.  Both the high and low temperatures are both adjustable.  For ease of use, the temperatures are proportional to either degree F or degrees C, using an accurate electronic sensor......[designed by David Johnson]
12V PWM Motor/Light Controller -  The diagrams are for 12V operation only and there are high side (common ground) and low side (common +12V) versions. The low side version of the circuit uses an N Channel FET,,...[G. Forrest Cook]
1381 Solar Engine -  Well the most common use is in a solaroller  which is a small wheeled car that charges up and then moves in a quick burst of speed. Since you can only use motors and coils with this circuit robots built ....[Mark W. Tilden mwtilden@lanl.gov]
1381-based Solar Engine -  Voltage-Controlled Solar Engine: Two simple solar engine designs using a 1381* voltage discriminator.  (added 11/05)
230 Volt AC Motor Controller -  Controls speed of230-Volt AC universal motor, in PDF format, text in Finnish…
324 OpAmp Stall-Motor Switch Machine Drivers -  The circuits on this page are switch machine drivers that can be used to operate Stall-Motor type switch machine motors. The circuits use LM324 Quad or 358 Dual operational… [from Rob Paisley's Model Train web site]

4-transistor H-bridge -  an interesting 4-transistor H-bridge variant; this is cheap and easy to build, and best of all is "smokeless" (i.e., no combination of inputs can cause  bridge to self-destruct).  (added 11/05)
555 Timer Forms Simple PWM Motor Controller -  Using a CMOS version of the 555 timer, this circuit can be used to control the speed of a motor by adjusting the duty cycle of the pulses sent to the motor.  (added 7/06) …. [Designed by David A. Johnson]
555-based solar engine -  Time-Controlled Solar Engine: a solar engine design using a 555 timer IC  (added 11/05)
556 Timer Stall-Motor Switch Machine Drivers -  The circuits on this page are switch machine drivers that can be used to operate Stall-Motor type switch machine motors. The circuits use LM556 dual timer chips to provide a PUSH-PULL output to reverse the polarity of the supply to the switch machine motors. [from Rob Paisley's Model Train web site]
68HC11 Read Encoder -  ….(Circuit design added 07/08/09)
6-transistor H-bridge -  This is  six transistor "Tilden style" H-bridge; while not as old as  original "basic H-bridge," this goes "way back," and is  basis for many BEAM driver circuits (added 11/05)
73 MHz Hallogene Lamp Radio-Controlled -  …....[Site is under construction right now]
74*245-based Motor driver -  A simple, time-honored approach is to use one or more 74*245 chips (normally  74AC245 is used for maximum current capability) to provide motor drive current. Here, each channel of drive power is provided by one or more buffer on  chip.  (added 11/05)
80C31 stepper Motor Controller -  (electronic circuit added 4/05)

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