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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. :


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

NE555 Pulse Width Modulator -  This circuit is capable of regulating 12V motors and DC light bulbs.  No coolrib required for Q1 or D3 if the current does not exceed 2A.  If it does, a sufficient coolrib for both the Schottky Diode  (D3) and MOSFET Q1 is required __ Designed by Tony van Roon  VA3AVR

Negative voltage generator -  takes in +12V and outputs around -11V __ Designed by pharkus @ hotmail.com

Negative voltage generation using 555 timer -  Schematic only, no circuit description included

NiCad Discharger for Tx & Rx Packs -  The reason I designed this discharger are many, however I will list a typical example.  A modeler charges his batteies for 14 hrs, then goes to the field for a fly.  He then rests for a week, then charges his batteries again for 14 hrs and flies again.  The third time, he repeats the procedure, then wonders why his aircraft has a major argument with the runway.  __ Designed by John Nooyen

Nine Volt Battery Eliminator -  for guitar pedals, radios etc __ Designed by G. Forrest Cook

Nine-Volt Stabilized Power Supply -  Schematic only __ Designed by Tony van Roon  VA3AVR

Nocturnal--solar engine -  Nocturnal -- These solar engines charge up when it's light, and discharge  (i.  e.  , power a load) when it's dark.  Nocturnal solar engine designs are built for just one thing -- to provide power to a nighttime load.  This means that unlike other SE designs, they charge continuously when there's light, then only release their power when it's dark -- essential behavior for BEAMbots that you only want to be active at night -- "crickets", night-lights, "pummers", and other such ornaments.   __ Contact: Eric Seale

No-Hum Fan Controller -  Control is derived from the output of regular wall switch.  The signal is filtered to obtain the dimming level as a low level analog voltage by C3 and its associated components.  The LM3914 chip selects one of its outputs depending on the amplitude of the voltage, which turns on one of the LEDs to indicate the speed, and turns on one of the Solid State Relays to control the fan speed.  The LEDs allow a handy display of the speed.  The top LED  (green) shows full power to the fan __ Designed by Ed Cheung

Nu-based stepper Motor drive -  A nifty  (single-IC!) circuit to drive the bipolar stepper motor that's a part of floppy drives:  __ Designed by Wilf Rigter

NuStepper -  Uses just a single IC ('though not one you're likely to have in your "parts box") to give you reversible motor drive __ Designed by Wilf Rigter

Oatley DC Motor Windmill -  Based on a 300watt 24v DC scoota motor, this little windmill would work well if I could boost the output voltage.  

On/Off Motor Control with Brake -  Modern electronic speed controllers  (ESCs) are very efficient, but they still have some drawbacks.  An inexpensive ESC with two IRFZ40 MOSFETs has an on-resistance of 14 milliOhm.  At 20A current, this means a voltage drop of 0.28V, and a power loss of 5.6W.  Furthermore, to build an ESC with a brake generally requires an expensive P-channel MOSFET

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

One 9V battery gives +18, +25, +33V -  This circuit is based on MAX1044 is a charge pump converter __ Designed by R.G. Keen

One component drives stepper Motor -  The extremely simple circuit in Fig 1 drives a stepper motor directly from 12V ac , 60 Hz power supply.  Usually you need switched-dc voltages to drive a stepper motor.  But a stepper motor will run off ac lines if you introduce a 90° phase shift between the voltages applied to the motor's two windings.  In this case only one 6.8uF non polarity capacitor is needed.   __ Contact: info @ wzmicro.com

One Wire Barometer -  By using a dual voltage supply, instrument precision and/or instrument range can be improved without adding significantly to the parts count.   __ Designed by A.G. Miller

Op Amp based PID Controller with SPICE simulation -  We've all heard about the wonders of the PID controller, bringing a system's output - temperature, velocity, light - to its desired set point quickly and accurately.  But now, your boss says okay, design one for us.  Although there's a number of ways to do it, the circuit above nicely separates the three terms into three individual op amp circuits.

Op-Amp Current Source with Floating Load including SPICE simulation -  The circuit above maintains a current through a floating load RL  (neither end is connected to ground.) The key to the circuit's operation is in placing a current sensing resistor RSENSE in the op amp feedback loop.  The current delivered to the load RL is:  I = Vin / RSENSE   How does the circuit work? Three simple functions help this circuit accomplish its goal.   (Remember, no current flows into the op amp's input terminals.) 

Optically isolated stepper Motor controller -  These are some very high-level instructions for building the Opto-Isolated Stepper Motor Controller. Not really a lot to say. Most of the construction is self-explanatory using the PCB artwork, the overlay, and the schematic. Note that the pad for pin 1 on ICs and such are square to help in proper placement. All ICs on the board are NOT oriented the same way, so pay attention. __ Contact: wrb @ cbnews . att.com

Optically Isolated TRIAC Driver -  One simple way of isolating the two parts of the circuit is shown below.  If a high intensity red led is used in the circuit below, the TRIAC can be switched using a current as low as ½mA.  This means that the circuit can be connected directly to the output of an op.  amp.  or even a CMOS logic chip.   __ Designed by © David Hoult

Optimizing Digital Motor Control Libraries -  Small electromechanical drives include solenoid drives, single direction DC, bi-directional DC, or brushless DC systems and are typically sized according to their frame size and power in watts.  Digital controllers, software, and complimentary analog and digital solutions from TI can help solve most drive requirements.   __ Designed by Texas Instruments App Notes, 15-Mar-07

OptoCoupled Gate Detects Motor Operation -  02/02/98 EDN-Design Ideas - Most applications require redundant system checks to ensure that devices are operating as expected.  The circuit in Figure 1 detects when a PWM-controlled servo motor is running.  You can monitor the motor-running signal output with a CPU or tie the output to hardware that indicates a fault if the motor is running when it should be off.  The motor's output connects to input resistors RIN1 and RIN2.  The use of two resistors protects the motor or servo amplifier in the case of a short circuit.  RIN1 and RIN2 also serve as current-limiting resistors for the LED in the opto gate, IC2. __ Circuit Design by Malcolm Watts, Wellington Polytechnic, Wellington, New Zealand

Optoelectronic position control simplifies Motor Movements -  29-Apr-04 EDN-Design Ideas - The optoelectronic technique for achieving position control provIdeas an inexpensive, easy- to-design method of achieving simple, repeatable movement using fixed index points with linear- or rotary-motion components.  The simple, basic design in Figure 1 for sequential position control exploits the quick response time of a power op amp, working in tandem with a pair of photodiodes __ Circuit Design by Marie Rivera, Apex Microtechnology Corp, Tucson, AZ

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


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