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Motor Control
Circuits Page 1 Motor Controls: #-BCD-GH-LM-O
P-RST-Z
Last Updated on:
Monday, October 03, 2011 06:07 PM
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)
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]
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)
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)
