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Motor Control Circuits
Motor Controls:  #'s - D       E - M       N - S        T - Z

 

Last Updated: November 30, 2017 10:29 AM

Circuits Designed by Dave Johnson, P.E. :

Classic Linear 5v Supply using 6.3VAC Transformer - There are times when you wish to control a pulse width modulation (PWM) signal with a DC voltage, ranging from 0v to 5v.  This voltage is often created by a computer interface.  The circuit below performs this voltage to PWM conversion.  PWM signals are often . . . Hobby Circuit designed by David A. Johnson P.E.-October, 2010

Computer Controlled PWM Circuit - There are times when you wish to control a pulse width modulation (PWM) signal with a DC voltage, ranging from 0v to 5v.  This voltage is often created by a computer interface.  The circuit below performs this voltage to PWM conversion.  PWM signals are often. . . Circuit by David A. Johnson P.E.-October, 2010

Cooling Fan Thermostat (12v) - 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 . . . Hobby Circuit designed by David Johnson P.E.-February, 2011

CW & CCW Alternating 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 . . . Hobby Circuit designed by David A. Johnson P.E.-September, 2010


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

CO2 controller for planted tanks -  Schematic only, no description __ Designed by Jim Hurley

Cockcroft Walton Diode Voltage Multipliers -  These circuits generate high voltages and can cause dangerous shocks! Do not build these devices unless you are experienced and qualified to work on high voltage devices. __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Cold Activated Switch -  The thermistor used has a resistance of 15k at 25 degrees and 45k at 0 degrees celsius.  A suitable bead type thermistor is found in the Maplin catalogue.  The 100k pot allows this circuit to trigger over a wide range of temperatures.  A slight amount of hysteresis is provided by inclusion of the 270k resistor.  This prevents relay chatter when temperature is near the switching threshold of this circuit __ Designed by Andy Collison

Compressor-Mate -  protection for refrigerators, freezers and air conditioners  __ Designed by Tony van Roon  VA3AVR

Computer Controlled PWM Circuit -  There are times when you wish to control a pulse width modulation  (PWM) signal with a DC voltage, ranging from 0v to 5v.  This voltage is often created by a computer interface.  The circuit below performs this voltage to PWM conversion.  PWM signals are often. . . Circuit by David A. Johnson P.E.-October, 2010

Computer Controller for DC Motors -  This circuit is easy to build and use and it can control two DC motors of any current or voltage rating, depending on the rating of the relays.  The circuit also provides two shaft encoders for positional feedback to the computer.   __ Designed by shaunwilson19 @ yahoo.com

Constant Current Charger -  This simple constant current source uses an LM317 regulator IC.  N.  B.  The pin-outs of the IC are not a mistake, the output is taken from the adjustment pin.  I found this circuit to charge all my NiCad batteries, and I use a Kambrook mechanical light-timer  (or equiv.) for 110vac to time the charge __ Designed by John Nooyen

Constant Power throttle -  How do simply incorporate constant power throttle __ Designed by Richard Torrens

Constant Temperature -  This circuit is a generic low power temperature controller that can be used for stabilizing temperature sensitive electronic circuits.  It was built to stabilize a radio frequency VFO  (Variable Frequency Oscillator) for ham radio applications.  The circuit has also been used to lower the drift of a Ramsey FM10a micropower FM transmitter __ Designed by G. Forrest Cook

Continuity Tester -  Occasionally you need a continuity test between two points in an electronic circuit.  Unfortunately, most continuity testers are prone to "lie".  They don't do that deliberately, but if they see a small resistance, they still tell you that you have continuity.  They just don't know any better __ Designed by Tony van Roon  VA3AVR

Control Isolated 12v Stepper Motor -  09/26/96 EDN-Design Ideas - Allows full direction and step control of a12V, four-phase stepper motor from a5V, TTL/CMOS -compatible logic controller.   __ Circuit Design by Martin O'Hara, Newport Components Ltd, Milton Keynes, UK

Control Slew for Stepper Drive -  03/14/97 EDN-Design Ideas - The circuit in Figure 1 provIdeas slewing control for stepper motors that you use in sophisticated applications, such as monochromator movements in optical experiments.  The LM331 VFC plays a vital role in this circuit.  The constant 10V dc from the IC9596 voltage reference routes to the VFC through the DG303 CMOS switch.  The DG303's __ Circuit Design by J Jayapandian, IGCAR, Tamil Nadu, India

Control Stepper Motors In Both Directions -  03/18/10 EDN-Design Ideas :Logic signals turn motors on and off and change direction.    __ Circuit Design by Vladimir Rentyuk, Modul-98 Ltd, Zaporozhye, Ukraine

Control stepper-motors -  8-Jan-04 EDN-Design Ideas - Stepper motors are useful in many consumer, industrial, and military applications.  Some, such as personal-transportation systems, require precise speed control.  Stepper-motor controllers can be simple (Figure 1) , but they require a variable-frequency square wave for the clock input.  The AD9833 low-power DDS (direct-digital-synthesis] IC with an on-chip, 10-bit DAC is ideal for this task, becaus __ Circuit Design by Noel McNamara, Analog Devices, Limerick, Ireland

Control stepping Motor via USB interface -  This is an example that demonstration how to control some devices via USB interface.  The PC software program with delphi.  Feature : CPU PIC18F4550 with full speed USB interface at 48MHz USB 2.0 compliance Use on-chip USB driver Control 1 stepping

Control stepping Motor via USB interface -  This is an example that demonstration how to control some devices via USB interface.  The PC software program with delphi.  Feature:, CPU PIC18F4550 with full speed USB interface at 48MHz.  , USB 2.0 compliance, Use on-chip USB driver

Controller for Stepper Motor using 4027 flip-flop & 4070 XOR gate -  I found this circuit in my files.  I don't know where it came from, but it looks like I photocopied it from somewhere years ago.  I have been told that it came from "The Robot Builder's Bonanza", by Gordan McComb.  Anyway, I thought that it should be fairly useful, so I decided to post it here.  The circuit is very simple and inexpensive.  This is good thing because most commercial stepper motor controller ICs are quite expensive.  This circuit is built from standard components and can easily be adapted to be controlled by a computer.  If you use cheap surplus transistors and stepper motor, the price of the circuit can be kept to under $10. __ Designed by Aaron Cake

Controlling a Stepper Motor using a Rotary Encoder -  Presented here is a project to control a stepper motor using an incremental rotary encoder.  It consists of a Raspberry Pi  (Raspi) board, 5-pin rotary encoder, 5V stepper motor and an...__ Electronics Projects for You

Controlling Stepper Motor with a Parallel Port -  This is an easy to build stepper motor driver that will allow you to precisely control a unipolar stepper motor through your computer's parallel port.  With a stepper motor you can build a lot of interesting gadgets such as robots, elevator, PCB drilling mill, camera panning system, automatic fish feeder, etc.  If you have never worked with stepper motors before you will surely have a lot of fun with this project. __ Designed by Electronics-DIY

Cooling Fan Controller -  As we begin to enjoy those lazy hazy days of summer, the most important thing on most of our minds is how to keep cool during those hot days.  For some of us that means turning up the old air conditioner and sipping on a nice cold glass of our favorite soft drink.  However, we often forget about an equally important __ Designed by Radio Amateur Society of Norwich

Cooling Fan Thermostat (12v) -  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 . . . Hobby Circuit designed by David Johnson P.E.-February, 2011

Current booster for 78nn series voltage regulators -  Volt regulators such as the LM708, and LM317 series    (and others) sometimes need to provide a little bit more current then they actually can handle.  If that is the case, this little circuit can help out.  A power transistor such as the 2N3772 or similar can be used    (See the project on the 3-part variable power supply) __ Tony van Roon  VA3AVR

Current loop interface -  This is a very simple circuit to interface a current loop sensor to an input which is designed for a voltage, such as that from a standard potentiometer.  This page is technical so that interested persons can build the circuit themselves, but 4QD can also supply the interface on a 'postage stamp' sized  (22mm x 27mm) board as shown in the first diagram.  It is a relatively trivial circuit!  __ Designed by Richard Torrens

Current-sense IC Prevents OverCurrent Damage -  04/25/96 EDN-Design Ideas - CMOS -interface ICs serve as gateways to the wired connections in electronic systems.  Mishandling those external connections can damage the interface ICs by causing shorts to ground or by applying voltages that result in latch-up.   __ Circuit Design by Gary Sellani, Maxim Integrated Products, Sunnyvale, CA

CW & CCW Alternating 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 . . . Hobby Circuit designed by David A. Johnson P.E.-September, 2010

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Motor Controls:  #'s - D       E - M       N - S        T - Z


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