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Control Circuits

 
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Last Updated: October 24, 2017 02:54 PM

Circuits Designed by Dave Johnson, P.E.

Boost Infrared TV/VCR Remote SignalThis circuit will boost the signal from any infrared TV or VCR remote, extending the range by a factor of 3X. . . . Hobby Circuit designed by Dave Johnson P.E.-October, 2005

Brush Motor Speed 12V ControllerIn 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:

Birthday Heart -  This circuit was made for my wife's birthday.  It is capable of flashing five strings of LED's with different frequencies.  It also has a connector for an 8 Ohm loudspeaker and two connectors for the small PCB's that are contained in musical greeting cards.  In this way the circuit will play alternatingly two room filling tunes at regular time intervals.  After a w __ Designed by Michel Van den Bergh On Electronics

Black Light powered by a 6 volt battery -  This circuit is a simple ultraviolate light that can be powered by a 6 volt battery or power supply that is capable of supplying 1 or more amps.  Circuit diagram Parts C1 0.0047uf Mono Capacitor C2 0.1uf Disc Capacitor D1, D2 1N4007 Diode FTB __ Designed by Aaron Cake

Blink a LED -  For non-embedded programmers the first thing to try on a new system or in a new programming language is to print out "hello world".  The equivalent for microcontrollers and other embedded systems is to blink a LED.  When even the target circuit and the programmer are freshly put together it is wise to start even lower, with a blink-a-LED program written by someone else that is known to be working.  Then when the LED does not blink   (which is likely) there is one thing less to doubt about.  On this page you will find 1 and 2 Hz blink-a-LED   (and some other) test programs for various targets chips and circuits.   __ Designed by © © 2002 Van Ooijen Technische Informatica / Wouter van Ooijen

Boat Lift Controller With Remote -  12-Sep-14 -Design News:   At my lake home, I have a Shore Station boat lift to lift my boat out of the water when it is not in use.  The lift has a manual crank and wheel, which can be quite tedious to operate.  I added a Lift Mate Universal motor from Shoreline Industries to crank the wheel for me.  This type of lift and lift __ Gadget Freak-Case #262

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

Boost Converter for Solar Cell Array -  The boost converter is used to charge batteries from low voltage solar  arrays.  Results were obtained using 3X3 cells that deliver about 400  millivolts at 1 amp.  The pictured panel array contains 20 cells in series  and generates about 8 watts at 8 volts in bright sunlight and was assembled  on a 12 X 16 picture frame.  Efficiency of the converter measured 87% and  delivers almost 600 milliamps into a 12 volt SLA battery.  Efficiency drops  to about 72% using 4 single cells in series   (pictured above) charging the  same 12 volt battery at around 70mA. __ Designed by Bill Bowden

Boost converter generates -27 & -87V -  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

Boost converter generates-27 and-87V -  05/22/97 EDN-Design Ideas In modern telecommunications applications, the basic communications link to the home is becoming either digital or wireless.  The normal circuitry to control a telephone is moving from the central office to the home.  Subscriber-li __ Circuit Design by David Feller, Harris Semiconductor, Dallas, TX

Boost Infrared TV/VCR Remote Signal -  This circuit will boost the signal from any infrared TV or VCR remote, extending the range by a factor of 3X. . . . Hobby Circuit designed by Dave Johnson P.E.-October, 2005

Brake Light Flasher for Motorcycles -  Several years ago one car manufacturer added a rapid flasher to their brake lights.  Wow! Those things really got your attention when the driver stepped on the brakes.  But, if you ever had to stop behind one at a traffic light at night, you were likely to go into seizures from the strobing, rear lights covering your field of vision.  I think they dumped the idea __ Designed by Tony van Roon  VA3AVR

Brake Light Signal Module -  Generates 4 short flashes, followed by a steady on light; Can drive LED Arrays at currents up to 1 Amp __ Contact: Flavio Dellepiane, fladello @ tin.it

Brakelight Flasher -  This is basically a flasher circuit modified to turn on and off a bulb instead of a LED.  It uses a 555 timer IC working as an astable multivibrator.  The flashing rate can be varied from very fast to a maximum of once in 1.5 sec by varying  preset VR1.    The ON time of  circuit is given by: TON= 0.69xC1x   (R1 + VR1) second and  OFF time is: TOFF= 0.69xC1xVR1 second __ Designed by Radioland.nt.au

Brakelight hookup -  This circuit is NOT a pulser or flasher! What's so special about this circuit? Well, the first third-brake light I installed I had to pull a wire from the Third Brake Light all the way underneath the carpet to the brake-pedal-switch and I thought it would be easier to pluck the signal of both brakelights via the trunk.  Bench-test your circuit first and apply power to the circuit,  __ Designed by Tony van Roon  VA3AVR

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 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

Buck regulator controls white LED with optical feedback -  10/25/07  EDN-Video Design IdeasBy using optical feedback, you can stabilize the output level of a high-intensity LED __ Circuit Design by Dhananjay V Gadre, Netaji Subhas Institute of Technology, New Delhi, India

Buck-Boost Controller Drives High-Power LEDs, Charges High-Voltage Batteries -  08/29/13  EDN-Design Notes The LT®3791 is a 4-switch synchronous buck-boost DC/DC converter that regulates both constant-current and constant-voltage at up to 98.5% efficiency with a single inductor.  It can deliver hundreds of watts and features a 60V input and output rating, making it ideal for driving high power LED strings and charging high voltage batteries when both step-up and step-down conversion is needed.  It can also be used as a constant voltage buck-boost regulator with current limiting and monitoring for both input and output.   __ Designed by Keith Szolusha, Linear Technology Corporation, also see Linear Technology Design Note 501

Build a 12/24V 3-Stage Solar Charge Controller -  Are you building the ultrasonic anti-fouling unit for your boat? You will need a solar panel and a charge controller to keep the batteries topped up.  Or are you thinking of a large solar panel for your caravan or 4-wheel drive? Again, you will need a solar charge controller.  This is the one to build.__ SiliconChip

Build a High Speed NiCd Charger for Electric R/C -  A few years back, I published a design for a Low Cost Thermal Peak Detection Charger.  Since then, I've designed several other chargers, in my ongoing quest to avoid having to spend money.  Of course, in building all these designs, I've probably spent more than a really good commercial charger would have cost me.  But designing and building is half the fun __ Designed by Stefan Vorkoetter

Build a Miniature High-Rate Speed Control with Battery Eliminator (BEC) -  Many designs for high-rate speed controls have been published.  Most require two 8-pin integrated circuits   (ICs) or one 14-pin IC.  Many designs suitable for home construction are fairly large   (some as large as 2" square).  Many do not include a brake __ Designed by Stefan Vorketter

Build a No-Battery Remote -  Never replace a battery in your remote control again! __ Contact: Jameco Electronics

Build a Precision Deadband -  20-Feb-03 EDN-Design Ideas Deadband circuits find applications in servo-control systems.  A precision current source and a half-wave inverting rectifier form a positive deadband circuit  (Figure 1).  The REF01, IC1, is a precision 10V voltage reference.  It forms a precision current source with the addition of a unity-gain buffer  (IC2A] and resistor R1 __ Circuit Design by V Manoharan, Kochi, India

Build a simple, soft-action muting switch -  14-Oct-04 EDN-Design Ideas The circuit in Figure 1 adds a soft muting switch with power-up/power-down muting to a line-level audio circuit.  R4, C1, and JFET Q1 quietly ground a signal in 100 to 200 msec when you close S1 or release it when you open S1.  Potentiometer R2, set to twice Q1's cutoff voltage, makes the on/off transition times roughly equal __ Circuit Design by John Firestone, Bremerhaven, Germany

Build a UPS for USB Devices -  04/11/02 EDN-Design Ideas Portable systems often include circuitry that derives power from an external source, such as USB.  When the system disconnects from the USB supply, a battery takes over and supplies current via a DC/DC converter.  A diode-OR connection  (Figure 1) offers the easiest way to ensure that the supply voltage doesn't sag during this switchover to the battery __ Circuit Design by Mark Cherry and Jean-Claude Ailloud, Maxim Integrated Products, Sunnyvale, CA, and France

Build a USB-based GPIB controller -  112/06/05 EDN-Design Ideas Roll-your-own USB-based instrumentation bus __ Circuit Design by Boštjan Glazar, Marko Jankovec, and Marko Topic, Laboratory of Semiconductor Devices, Ljubljana, Slovenia

Build a Voice-Activated Relay (VOX) -  Triggers devices on and off with sound.__ SiliconChip

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

Build Stepper Controller from Recycled Materials -  I am 13 I have always wanted to build a cnc machine but because inexpensive parts are hard to find in Canada I have had trouble trying to build a decent cnc controller.  The purpose if this Instructable is to show that anyone can build a cnc __ Designed by Radio LocMan

Build Your Own Popcorn Strobe -  Mini 555 Monostable circuit creates big fun. __ Contact: Jameco Electronics

Building an RF Remote Control SystE - M -  With a handful of inexpensive components, a little creativity, and the power of PicBasic, you can build some pretty outstanding robotics creations as Rob Arnold proves with his Ruf-Bot project.   __ Designed by Rob Arnold

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Control Circuits:   #'s - A       B - C       D - G        H - L       M - P        Q - S        T - U        V - Z

 


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