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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. :

Logic Controlled 12v DC Motor with Automatic Brake - There are times when you would like to control a DC motor using a simple +5v logic swing signal.  The circuit below performs this feat and also includes an automatic motor braking circuit.  This circuit will bring a fast moving DC motor to a stop in seconds.  The braking action is automatically applied whenever DC power is removed. . . Circuit by Dave Johnson P.E.-February, 2010

Low Power H Bridge Motor Controller - This circuit uses a few logic gates & a 74AC240 to control power to a small gear motor. . . Circuit by Dave Johnson P.E.-July, 2005

 
Low Voltage Latch Circuit - A Discover Circuits visitor wanted a simple on/off latch circuit which can turn on and off power to a small motor.  The kicker was that he wanted to power the circuit and the motor from a single 1.2v NiMH
battery cell.  Texas Instruments comes to the rescue with their family of low voltage single gate ICs.  Specifically the SN74AUP1Q14 Schmitt trigger inverter will operate down to 0.8v and lower.  When used with a good NPN transistor, the circuit below works quite nicely. . . Circuit by Dave Johnson P.E.-March, 2013

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

Ignition Coil Buzz Box -  Here's a circuit to create a buzzcoil using a standard automotive ignition coil.  A 556 dual timer is used to establish the frequency and duty cycle of the coil current.  One of the timers is used as an oscillator to generate the 200 Hz rectangular waveform needed to control the  (IRF740 MOSFET) while the second timer __ Designed by Bill Bowden

Ignition Coil Driver -  This is a high energy ignition coil driver circuit capable of running from AA batteries.  WARNING:This circuit contains voltages and currents which can KILL if you are not careful.  Charged capacitors will SURPRISE YOU! They can hold a lethal charge for hours! __ Designed by Robert Dvoracek 25-7-05

Ignition for Old Cars -  In older carbureted cars, the con-tact-breaker  (CB) point ignition system is used to fire the spark plugs.  You can convert the ignition system of your car from CB-point-cum-condenser type into electronic...__ Electronics Projects for You

Implement a stepper-motor driver in a CPLD -  02/15/07  EDN-Design Ideas - Replace a hard-to-find stepper-motor-driver IC with a programmable-logic device __ Circuit Design by Stephan Roche, Santa Rosa, CA

Improved Speed Controller for Universal Motors -  Use it to control the speed of circular saws, routers, jig saws, electrics drills and lawn edgers rated up to 1200W.__ SiliconChip

Induction Motor Conversion -  This was a little project to convert a small induction motor to a permanent magnet windmill. 

Inexpensive logic controls stepper Motor -  EDN-Design Ideas - March 26, 1998    [ NOTE : File has multiple design, scroll for this one.]  A number of sophisticated ICs for stepper-motor control are now available. However, the advanced features of these chips--self-clocking, high-current drive, and full-step, half-step, and direction control--are often unnecessary or remain unused. For a design that needs to control only the number of steps, drive speed, and direction, you can make a very simple and inexpensive driver using two low-level logic chips  (Figure 1) . __ Circuit Design by David Ellis, Ellis Lindauer, Pullman, WA

Infrared Toy Car Motor Controller -  This add-on circuit enables remote switching on/off of battery-operated toy cars with the help of a TV/ video remote control handset operating at 30–40 kHz.  When the circuit is energised from a...__ Electronics Projects for You

Intelligent Water Pump Controller with Water-level Display -  Most of the circuits for multi-level indication/control of water in tanks employ a bunch of wires running between the circuit and the overhead tank, which accounts for almost half the cost of the entire project.  Here is an intelligent scanned water-level indicator-cum-pump controller circuit that utilises just four wires to the overhead tank to indicate nine different levels.  

Interfacing 5 Volt CMOS to 12 Volt loads -  The circuit above is designed to be used with the bi-directional lamp sequencer shown above on this same page.  Two additional transistors are used to increase the current from the 74HCT138 decoder to control 12 volt 25 watt lamps.  A 6.8 volt/1 watt zener diode is used in series with the ground connection of all the CMOS ICs (74HC14, CD4516 and 74HC138s) so that the total voltage across the CMOS devices will be about 5.2 volts and the outputs will move from +12 to about +7 when selected.  The 2N2905/PNP transistor stage is connected as an emitter follower which provides a high impedance to the __ Designed by Bill Bowden

Inverter 12 volt unit Mos-Fet Design -  A Very Reliable, Efficient and Practical Design.  Do Not ask how to Build this for Power ratings over 1000 watts, That is NOT Practical.   __ Designed by G.L. Chemelec

IRADK10 Motor Drive Reference Design Kit -  The kit has a Graphical User Interface  (GUI) that enables the user to control motor speed and set the basic control parameters such as PWM frequency and shut down conditions via the serial link.  

Japanesque Ceiling Light -  This is a Japanesque ceiling light without any electronics.  Everybody will able to build easy even if they have no electronic skill.   __ Designed by The Electronic Lives Manufacturing-presented Chan

LDR light/dark activated relay switch -  We wanted to do a light/dark switch as a kit.  But we found there were several types of basic circuit.  This is one type of circuit.  Two other types may be found in Kits 79B and 79C.   __ Designed by R. M. Marston

Lead Acid Battery Charger with Float -  The circuit furnishes an initial charge voltage of 2.5 Volt-per-cell at 25°C to rapidly charge a Lead-Acid battery.  The charging current decreases as the battery charges, and when the current drops to about 180mA, the charging circuit reduces the output voltage to 2.35 Volt-per-cell, floating the battery in a fully charged state.  This lower voltage prevents the battery from overcharging, which would shorten its life.  The LM301A  (Tony van Roon's U3) compares the voltage drop across R1 with an 18-mV reference set by R2.  The comparator's output controls the voltage regulator, forcing it to produce the lower float voltage when the battery-charging current passing __ Designed by Tony van Roon  VA3AVR

Lead/acid battery charger -  YES!!!! Found the perfect solution for hum caused by filaments. But what happens after a few hours when the batteries start getting drained?  The logical follow-up of battery heated filaments is of course a battery charger.  The circuit below I got from a friend who used them in his own 26 preamp  (nice tube, eh!?) .  It is very simple to build requiring only a handful of cheap parts and an extra winding on your power tranny  (or a separate tranny) .  Since the charger described is not active during sound reproduction, I have made no criteria on parts quality, so el-cheapo was the way to go. __ Contact: site @ vt52 . com

Leveraging the High-End Timer Transfer Unit on Hercules ARM Safety MCUs (Rev. A) -  The brushless DC motor has stator windings and permanent magnets on the rotor.  The windings are connected to the control electronics and there are no brushes and commutators inside the motor.  The electronics energize the proper windings similar to a commutator; the windings are energized in a moving pattern that rotates around the stator.  The energized stator windings lead the rotor magnet.   __ Designed by Texas Instruments App Notes, 6-Sep-11

Light / dark activated relay -  The potmeter adjust the trigger 'on' level.  The diode in the diagram shows to be 1N914.  This is ok if you have a light-duty relay, also the 1N914 is a signal diode so actually does not qualify.  Use a 1N4001  (Tony van Roon's or better) instead.  A couple of substitutes for the 2N2222 transistor are: NTE123A, ECG123A, PN100, etc __ Designed by Tony van Roon  VA3AVR

Light Controller High Side -  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, the high side version of the circuit uses a P Channel FET.  N Channel devices tend to handle more current than P Channel devices, they are also less expensive.  The high side version of the circuit is useful when one side of the load has to be grounded __ Designed by G. Forrest Cook

Light Operated Switch -  The circuit above shows a simple application of light operated switch.  This circuit senses the ambience light and depending on the presence/absense of sufficient ambience light, it turnes the bulb On/Off automatically.  The bulb gets on when there is insufficient ambience light  (e.g evening or night time) and switches off automatically when enough ambience light is present.   (e.g In day time, when the sun light is present additional light may not be needed.)  __ ` Sigmatone

Light/Dark Detector drives a relay -  This handy little circuit can tell the difference between darkness and light, making it very useful for switching on and off signs, porch lights or other things when it gets dark or light.   __ Designed by Aaron Cake

Limit switches control dc-motor H bridge -  03/05/09  EDN-Design Ideas - Mechanical and electronic switches provide interlocks, preventing motors from overrunning their bounds __ Circuit Design by Andreas Grün, Wedemark, Germany

Line following Robot -  This is a tiny line following robot which can run on the desk.   __ Designed by The Electronic Lives Manufacturing-presented Chan

LM3914 battery Monitor -  This circuit should be powered by its own battery, otherwise you might get an innacurate reading.  hook the to-be-monitored battery to pin 5 of the chip.   __ Designed by Andy Wilson

Logic Controlled 12v DC Motor with Automatic Brake -  There are times when you would like to control a DC motor using a simple +5v logic swing signal.  The circuit below performs this feat and also includes an automatic motor braking circuit.  This circuit will bring a fast moving DC motor to a stop in seconds.  The braking action is automatically applied whenever DC power is removed. . . Circuit by Dave Johnson P.E.-February, 2010

Low Cost Universal Battery Charger -  This is a Low Cost Universal Battery Charger Circuit.  This circuit is used to charge NiCD-NiMH
batteries and ideal for car use.  This circuit transforms a mains adapter to a charger.  It can be used to charge MP3 players, portables, toys cellular phone, video batteries.

Low Power H Bridge Motor Controller -  This circuit uses a few logic gates & a 74AC240 to control power to a small gear motor. . . Circuit by Dave Johnson P.E.-July, 2005

Low Power LED Voltmeter -  This is a low power voltmeter circuit that can be used with alternative energy systems that run on 12 and 24 volt batteries.  The voltmeter is an expanded scale type that indicates small voltage steps over the 10 to 16 volt range for 12 volt batteries and over the 22 to 32 volt __ Designed by G. Forrest Cook

Low side 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, the high side version of the circuit uses a P Channel FET.  N Channel devices tend to handle more current than P Channel devices, they are also less expensive.  The high side version of the circuit is useful when one side of the load has to be grounded __ Designed by G. Forrest Cook

Low Voltage Latch Circuit -  A Discover Circuits visitor wanted a simple on/off latch circuit which can turn on and off power to a small motor.  The kicker was that he wanted to power the circuit and the motor from a single 1.2v NiMH
battery cell.  Texas Instruments comes to the rescue with their family of low voltage single gate ICs.  Specifically the SN74AUP1Q14 Schmitt trigger inverter will operate down to 0.8v and lower.  When used with a good NPN transistor, the circuit below works quite nicely. . . Circuit by Dave Johnson P.E.-March, 2013

LTC Design Note 512: 65V 500mA step-down converter fits automotive & industrial applications -  05/31/14  EDN-Design Ideas - This switcher is happy to drop a 60V input all the way down to 0.8V.  The trend in automobiles and industrial systems is to replace mechanical functions with electronics, thus multiplying the number of microcontrollers, signal processors, sensors, and other electronic devices throughout.  The issue is that 24V truck electrical systems and industrial equipment use relatively high voltages for motors and solenoids while the microcontrollers and other electronics require much lower voltages.  As a result, there is a clear need for compact, high efficiency step-down converters that can produce very low voltages from the high input voltages __ Circuit Design by Charlie Zhao

LTC1840: I2C Fan Control Ensures Continuous System Cooling -  DN270 Design Notes__ Linear Technology/Analog Devices

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

 


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