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

 
 

Last Updated: October 24, 2017 02:55 PM

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:

Car Fan Speed Controller -  Using this circuit you can control the speed of 12V DC fans used in cars.  The circuit is built around timer 555, which is wired as an astable multivibrator.  The output...__ Electronics Projects for You

Car Window Closer -  This circuit automatically rolls up a car’s electric windows when it rains.  The windows are rolled up one at a time while the system monitors the window motor current.  When the motor stalls, the system moves to the next window and shuts off it’s the last  __ Designed by Andrew R. Morris

Ceramic Speaker Driver Also Drives Motors -  10/07/10 EDN-Design Ideas - DC coupling turn the speaker driver into a motor driver.    __ Circuit Design by John Guy, National Semiconductor Corp, Santa Clara, CA

Charge Monitor for 12 Volt Rechargeable Lead Acid Battery -  A battery is a vital element of any battery-backed system.  In many cases battery is more expensive than system it is backing up.  Hence we need to adopt all practical measures to conserve battery life.  As per manufacturer's data sheets, a 12V rechargeable lead-acid battery should be operated within 10.  IV and 13.8V.  When battery charges higher than 13.8V 

Charger for Gel Lead Acid Batteries -  This high-performance circuit first quickly starts  (Tony van Roon's and holds) the charge at 2 amp, but as the voltage rises the current will consequently decrease.  When the current falls below 150mA, the charger automatically switches to a lower 'Float' voltage to prevent overcharging.  At the point that a full charge is reached, Q1 will bias and the LED will light.   __ Designed by Tony van Roon  VA3AVR

Cheap Stepper Motor Driver -  Schematic only, no circuit description included __ Designed by Tom McQuire

Chloroplast Voltage Controlled Solar Engine -  Voltage-Controlled Solar Engine: These designs are based on the Motorola MC34164-* micro power undervoltage sensing ICs.  They're pretty efficient, work at higher voltages than most solar engines, and can provide voltages for other logic circuits  (say, a microprocessor) .  This page hosts the original Chloroplast by Craig Maynard, as well as some Chloroplast variants by Wilf Rigter.   __ Designed by Craig Maynard

Circuit Allows Long PWM Soft Starts -  02/01/07  EDN-Design Ideas - Enhance timing accuracy of a switching regulator's start-up ramp __ Circuit Design by Robert N Buono, Aeolian Audio LLC, Bloomfield, NJ

Circuit Controls 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

Circuit Controls 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

Circuit controls stepper-motors -  01/08/04 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 __ Circuit Design by Noel McNamara, Analog Devices, Limerick, Ireland

Circuit for Soft-Start Module -  Simple circuit that reduces surge current on start of an induction motor __ Designed by Wichit Sirichote

Circuit forms DC-motor switch with brake -  10-Jan-02 EDN-Design Ideas - Controlling a small dc motor without speed control sounds like a trivial task; a switch or a relay should suffice.  However, several problems accompany this approach.  For one, the switch, because of the inductive load and the low starting resistance of the motor, tends to wear out prematurely (with all the related sparks and EMI problems] __ Circuit Design by JB Guiot, DCS AG, Allschwil, Switzerland

Circuit Generates Analog Fan Speed Control -  Maxim-IC Appnote #1125 This circuit delivers a continuous and linear fan-control voltage that is proportional to temperature.  __ Maxim Integrated

Circuit generates fan-speed control -  03/21/02 EDN-Design Ideas - Fan noise is becoming a significant issue as electronic equipment increasingly enters the office and the home.  Noise is proportional to fan speed, and the airflow¡ªhence, fan speed¡ªnecessary for cooling is less at low ambient temperatures.  Because ambient temperature is lower than the upper design point most of the time, a fan can run slower, making it easier on the ears __ Circuit Design by Jim Christensen, Maxim Integrated Products, Sunnyvale, CA

Circuit Measures Small Current in DC Servo Motor -  12/06/01 EDN-Design Ideas - The simple Circuit design in Figure 1 lets you measure all components of a current flowing in a dc servo motor.  The rectified output of the circuit uses ground as a reference, so you can measure the output by using a single-ended A/D converter.  The current-sense resistor, R1, has a value of 0.1Ω  __ Circuit Design by Shyam Tiwari

Circuit protects system from overheating -  11/08/01 EDN-Design Ideas - The two-chip circuit in Figure 1 provIdeas fan control and overtemperature warning and shutdown signals to protect systems from excessive heat.  The circuit monitors the temperature of the pc board and the die temperature of a CPU, an FPGA, or another IC with an on-chip temperature-sensing transistor __ Circuit Design by Kerry Lacanette, Maxim Integrated Products, Sunnyvale, CA

Circuit Provides Bidirectional Variable Speed Motor-Contro -  05/16/02 EDN-Design Ideas - During the development of systems that include small motors, a simple, bidirectional motor controller with speed adjustment may be heLPFul.  Figure 1 shows such a controller.  The circuit uses everyday components whose tolerances and ratings are unimportant as long as they sustain the required voltage, current, and power __ Circuit Design by Jean-Bernard Guiot, DCS AG, Allschwil, Switzerland

Circuit provides brownout control of 80C31 -  08/19/99  EDN-Design Ideas - In the reset and watchdog-timer circuit in Figure 1, IC1 is a 74HC14 Schmitt-trigger inverter that, with R1 and C1, acts as an astable oscillator.  The circuit provIdeas an active-high reset for an 80C31 µC.  The watchdog trigger (WDT) consists of watchdog-trigger pulses __ Circuit Design by N Kannan, Mediatronix, Pappanamcode, India

Circuit Provides Class D Motor Control -  1-May-03 EDN-Design Ideas - Class D audio amplifiers provide a dual benefit for battery-powered portable devices.  They enhance battery life, and they produce much less power dissipation than do their linear cousins.  Those features make Class D amplifiers ideal candidates for controlling speed and direction in small electric motors __ Circuit Design by John Guy, Maxim Integrated Products, Sunnyvale, CA

Circuit provides efficient fan-speed control -  4-Mar-04 EDN-Design Ideas - As Moore's Law plunges us into the realm of multigigahertz processors and PCs with gigabytes of RAM, engineers face the task of removing the heat that these state-of-the-art components produce.  Cooling such systems poses a dilemma.  If you optimize the fan size and speed for nominal operating conditions, the system is susceptible to failure when conditions deteriorate __ Circuit Design by John Guy, Maxim Integrated Products, Sunnyvale, CA

Circuit Smoothly Drives Stepper Motors -  05/28/09  EDN-Design Ideas - Adding an analog switch make the motor bidirectional - The circuit in This design idea     drives low-power, unipolar stepper motors using only a shift register, a few resistors, and low-power transistors.  Adding an inexpensive 4053 an __ Circuit Design by Uwe Schüler, Institute of Physiology, Tübingen, Germany

Class D Motor Control -  05/01/03  EDN-Design Ideas - Class D audio amplifiers provide a dual benefit for battery-powered portable devices.  They enhance battery life, and they produce much less power dissipation than do their linear cousins.  Those features make Class D amplifiers ideal __ Circuit Design by John Guy, Maxim Integrated Products, Sunnyvale, CA

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

CMOS Control Voltage for Firing Crydom Soft-Start Motor Module -  I noticed my wife mixer when start up, the induction motor draws higher current than normal running.  I think better to insert the circuit that gradually applies power the motor.  I found the nice module made by Crydom that uses solid-state relay in conjuntion with soft start circuit.  The module has CMOS logic for controlling.  We can apply the low power logic to control such AC machine easily.   __ Designed by Wichit Sirichote

CMOS Toggle Flip Flop using Push Button -  The circuit below uses a CMOS dual D flip flop  (CD4013) to toggle a relay or other load with a momentary push button.  Several push buttons can be wired in parallel to control the relay from multiple locations.  A high level from the push button is coupled to the set line through a small  (0.1uF) capacitor.  The high level from the Q output __ Designed by Bill Bowden

CNC Router -  Now this was an interesting project. 

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

 


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