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


Last Updated: December 29, 2017 03:15 AM

Circuits Designed by Dave Johnson, P.E. :

Brush Motor Speed 12V Controller - In many applications, you would like to hold the speed of a motor constant, even as variations in the power supply voltage or mechanical load try to change its speed.  In other applications, the average current to the motor needs to be limited, so the. . . Circuit by Dave Johnson P.E.-May, 2007

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

Back EMF PM Motor Speed Control - Back-EMF refers to using the voltage generated by a spinning motor    (EMF) to conclude the speed of the motor's rotation.   This can be used in motion control algorithms to modulate the velocity or to compute the angular distance the motor has traveled over __ Contact: Acroname Inc.

Basic 78xx series regulator mains power supply - Everyone needs a power supply.  This simple one shows the general principles.  The first step is to select a transformer suited to your need.  The primary should be for the correct mains voltage in your country    (120V in the US, 240V in most of the rest of the world) .   __ Designed by 2009-2014 Hans Summers

Basic Stepping Motor Controls - This section of the stepper tutorial deals with the basic final stage drive circuitry for stepping motors.  This circuitry is centered on a single issue, switching the current in each motor winding on and off, and controlling its direction.  The circuitry discussed in this section

Basic UP - S - This circuit is a simple form of the commercial UPS, the circuit provides a constant regulated 5 Volt output and an unregulated 12 Volt supply.  In the event of electrical supply line failure the battery takes over, with __ Designed by Andy Collinson

Battery Current Sensor: Part 1 - How do simply incorporate constant power throttle __ Designed by Richard Torrens

Battery Low Voltage Beeper - This circuit provides an audible and visual low voltage warning for 12V battery powered devices.  Idle current: 6ma Low Voltage Warning current: 15ma.   __ Designed by G. Forrest Cook

Battery Voltage Monitor - R1 controls the trip-point of the circuit.  adjust it accordingly.  to reverse the logic    (have the led light up when the battery has at least X amount of power,) connect the led to ground through R4.   __ Designed by Andy Wilson

Battery voltage Monitor using an LM358 op-amp - This circuit is used to monitor the battery voltage, using a bi-color LED to indicate the state of the battery.  When the LED is "GREEN" the battery voltage is above 11.9 volts.  When the LED is "YELLOW", the battery voltage is between 11.9 and 11.5 volts.  When the LED is "RED" the battery voltage is below 11.5 volts.  You can of course, modify the trigger points by using the trimmer resistors and/or changing the value of the dropping resistors in the divider. __ Designed by Steven Weber, KD1JV

BEAM Stepper - 74AC240-based circuit to drive small bipolar stepper motors    (e.  g.  , ones in floppy drives)  __ Designed by Wilf Rigter

BEAM Stepper drive - The 74AC240 stepper driver works by alternately enabling each half of the buffer.  Only one half can be enabled at a time.  Let's assume that the top half of the driver is enabled.  U1A & U1B along with R8, C1, and the input protection resistor R7 form a square wave oscillator.  The outputs of U1A & U1B directly drive one coil of a bipolar stepper motor.   __ Designed by Duane Johnson and Wilf Rigter

Bidirectional Motor Speed Controller - Easy-to-build project can control the speed of 12-24 V DC motors in both forward and reverse directions.__ SiliconChip

Bi-Directional Motor Speed Regulator - This circuit shows the concept I used in the drill motor control that I submitted earlier.  I cam up with it in 1994 when I built the device.  My algebra and my patience are a bit too rusty at my age now to write an equation that describes the relationship between the BEMF of the motor and Vin.   __ Designed by Andrew R. Morris

Bipolar Stepper Motor Control - First, we want to explain how such a controller works and whats involved.  A bipolar motor has two windings, and thus four leads.  Each winding can carry a positive current, a negative current or no current.  This is indicated in Table 1 by a +, a or a blank.  A binary counter  (IC1) receives

Bipolar Stepper Motor Control - In this circuit, a potentiometer controls both the speed and direction of a small bipolar stepping motor like those found in many 5 1/4" floppy disk drives.  Note that the bipolar motors are distinguished from "unipolar" types, in that bipolar units have two coils instead of four, and four wires instead of five.  With the potentiometer at the extreme counterclockwise position, the motor runs counterclockwise at the maximum speed.  Rotating the potentiometer toward the center slows the motor, until it stops.  Continuing potentiometer rotation clockwise, the motor starts to run clockwise, increasing in speed to the maximum clockwise position __ Designed by Arthur Harrison

Boost converter controls 12V fan from 5V supply - 12/12/97 EDN-Design Ideas - Temperature-controlled PWM boost converter allows operation of a12V brushless dc fan from a5V supply.    __ Circuit Design by John McNeill, Worcester Polytechnic Institute, Worcester, MA

Breadboard supply-very Low dropout adjustable power supply - This project details the design of a very low dropout adjustable power supply.  A good power supply is essential to electronic projects.  While there are many existing designs for adjustable power supplies, this one makes improvements that make it more useful for hobby designs.   __ Designed by Lucky Larry

Bridge heA - D - The LDR's were hand-picked.  Got two packages of them from Radio Shack, looking for at least two pairs of similar parts.  Then added wire-wrap pin sockets, to the circuit, so that the LDR's could be plugged in.  Currently, the 0.33UF cap is not being used on my B-Head's.  I made a long J-hook from "Jumbo Paper Clips", attached it to the motor shaft, and then hung it from my rear-view mirror so it can "see the lights" __ Designed by Paul T. Barton

Brush DC Motor Drive - The LS7260 series of Brushless DC Motor Commutator ICs can easily be used to drive Brush DC motors.  All the features for driving Brushless DC motors still apply, including Enable, Speed Control, Overcurrent Protection and Braking.  Figure 1 illustrates a Brush DC motor driven by a Power FET H-Bridge__ LSI Computer Systems

Brush Motor Speed 12V Controller - In many applications, you would like to hold the speed of a motor constant, even as variations in the power supply voltage or mechanical load try to change its speed.  In other applications, the average current to the motor needs to be limited, so the. . . Circuit by Dave Johnson P.E.-May, 2007

Brushless DC electric Motor control by CPLD - The main area for application of brushless direct current motors    (BLDC) is positioning.  In this article I am going to describe a simple solution to operation with two phase sine/cosine BLDC. 
The main idea is to generate sine and cosine by Pulse Weight Modulation    (PWM) using configurable logic for example field programmable array    (FPGA) or complex programmable logic device    (CPLD) .  

Brushless DC Motor Driver - Use of brushless DC motors    (BLDCs) is on the rise.  But their control usually requires rotor-position information for selecting the appropriate commutation angle.  Normally, a Hall Effect sensor is used to...__ Electronics Projects for You

Brushless PM Motor Drive - Monolithic full-bridge and half-bridge gate drivers are available and include protection, dead time and supply circuits.  Bi-directional brush DC motor drive __ Designed by STMicroelectronics

Build a 10 Amp 13.8 Volt Power Supply - Sometimes amateurs like to home-brew their power supplies instead of purchasing one off the shelf at any of the major ham radio retail dealers.  The advantage to rolling your own power supply is that it teaches us how they work and makes it easier to troubleshoot and repair other power supply units in the shack.  It should be noted that there is no real cost advantage to building your own power supply unless you can get a large power transformer and heat sink for a super low price.  Of course rolling our own gives us the ability to customize the circuit and make it even more reliable than commercial units.   __ Designed by N1HFX

Build a breadboard power Module for integrateds - When I began building effects, I built directly on perfboard and sometimes, I had never before heard the circuit.  This led to, on a few occasions, being disappointed with the sound and later de-soldering the valuable parts and throwing away the rest.  Other times, I would want to modify various components and would need the soldering iron for that as well.   __ Contact: holler @ runoffgroove.Com

Build a High Performance Voltage Regulator from Discrete Components - While integrated circuits have become a staple of all modern circuit designs, it is still possible to build circuits without ICs and still achieve a high level of performance.  The circuit in Figure 1 is a high performance 5 volt voltage regulator built using discrete components that are readily available.  I have used no ICs and I have even substituted a 1N4001 in lieu of a zener diode.  The regulator output voltage varies by a mere .4% and has current limiting at 1.5 amps along with short circuit protection.  With the exception of thermal shutdown, this circuit closely matches the performance of the 7805 5 volt regulator IC. __ Designed by N1HFX

Build a Simple Circuit Rechargeable CMOS Battery - Occasionally we come across a computer motherboard that seems to eat those CR2032 batteries every 4 to 5 months.  This is particularly frustrating because the computer works perfectly once booted but all the important BIOS settings are lost when the CR2032 battery fails.  This is very irritating if the affected computer will not boot up with the default BIOS settings.  I recently had a computer motherboard with this same irritating phenomenon.  A test revealed that the current drain __ Designed by Radio Amateur Society of Norwich N1HFX

Build an On/Off Motor Controller with Brake - The circuit for the controller begins with a buffer, consisting of R1, R2, R3, and Z1A, which isolates the receiver from the rest of the circuit and makes operation of the circuit independent of the exact signal levels from the receiver.   __ Designed by Stefan Vorketter

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

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