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Control Circuits

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Last Updated: October 24, 2017 02:54 PM

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

Easy Parametric & Graphic Eq's Plus Peaks & Notches -  If you're into playing with tone controls and notch filters to see how they change the sound out of your effects, you will undoubtedly have built several glops of R's, C's and pots, maybe some L's to make up the tone networks.  While this is fun, it's not very flexible.  Sooner or later you might wonder if there is a more general solution to messing with tone controls.   __ Designed by © 1999 R.G. Keen

Economical Pump Controller -  The automatic pump controller eliminates the need for any manual switching of pumps installed for the purpose of pumping water from a reservoir to an overhead tank (refer Fig.1).  It automatically...__ Electronics Projects for You

Economical Pump Controller -  Having a reliable system to pump out a sump pit is essential as mistakes and failures can lead to serious flooding and enormous expense.  In our article Sump Pump Control System we introduced a selection of electronic solutions to the following problems __ Designed by REUK-Renewable Energy UK website

Eddie's Composting Loo fan controller VRS 2 -  While version one worked as designedthe toilet lid did not seal as well as I'd hoped.  Here is my second attempt at a fan controller.  To confuse you more the PCB shown here is intended to be multi-functional.  Depending on how it is populated and programmed it can control either a fan or a pumpmaybe more uses will come along.   __ Designed by Eddie Matejowsky

Edge Detector runs off of single supply -  12/04/97 EDN-Design Ideas You can use a single-supply circuit to generate a pulse on both the rising and the falling edges of a signal for use with counters or similar devices that require only a rising edge to trigger(Figure 1a).  R1 and C1  form a differentiator that converts rising edges to positive spikes and falling __ Circuit Design by Joe Meloche, Ingersoll-Rand Fluid Products Division, Bryan, OH

EEPROM Emulation with the TMS320F28xxx DSCs -  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, 21-Sep-09

Efficient LED Blinking for Embedded Systems -  Smart hardware design can simplify the embedded software and make it more reliable.  Designers use blinking LED signals to indicate different status and for inbuilt testability.  Making an LED array blink...__ Electronics Projects for You

Eight LEDs Random Flasher -  This project uses a 4026 counter and display driver IC to flash eight LEDs in an apparently random manner.  It can be used to create a display of your choice.   __ Designed by John Hewes

Eight-Function Remote Uses One Button, No Microcode -  12/15/09  EDN-Design Ideas Simplify the operation of a remote control __ Circuit Design by Jay Davis, Boeing Integrated Defense Systems, Wichita, KS

EL wire eye candy The 8-channel sequencer will switch the wires according to programmed patterns.  It uses a Basic Stamp II microprocessor.  The Mikey Sklar's el pants & bag and Greg Sohlberg's Rhino-8 sequencer.  I used the Basic Stamp II for the processor, and went with Greg's suggestion & used a 9-pin connector, with 8 HV outputs and one "common", instead of individual 2-pin connectors for each of the 8 EL wire channels.   __ Designed by guerroloco

Electric Curtains Control -  This hybrid circuit uses a mixture of transistors, an IC and a relay and is used to automatically open or close a pair of curtains.  Using switch S3 also allows manual control, allowing for curtains to be left only partially open or closed.  The circuit controls a motor which is attached to a simple pulley mechanism, to move the curtains.  I first started this circuit over 20 __ Designed by Andy Collison

Electric heater thermostat -  One Advantage of these two units is the Sensor can be placed Away from the heater, therefore sensing the Actual Room temperature, not the direct heat from the heater.  These can also be used in a confined space with a Heat Lamp, to create a Drying Oven  __ Designed by G.L. Chemelec

Electric Motor -  Back in the old days, before home computers, there were certain things that technically minded boys just had to have done, and one of those was to build a working electric motor from scratch.  I built this one when I unexpectedly had time off school because of a fire in the auto shop there __ Designed by Markus Wandel

Electric Power Controller -  suitable as dimmer for 100-Volt lamp up to1200W __ Designed by Seiichi Inoue

Electronic candle -  This  circuit  will  detect  light  falling  on  the  Light Dependent Resistor (LDR or CdS).   When light falls on the  LDR  the  arrangement  of  resistors  at  the  base  of  the transistor T1 gives a change of voltage.   This biases or turns  on  the  transistor  which  turns  on  T2,  allowing sufficient  current  to  flow  to light the globe.   The arrangement of the  resistors at the base of T1 is called a Potential Divider.   It is adjusted to suit ambient light conditions by the variable resistor VR1.   A typical use would be to set the project up in the refrigerator.  The light will light up in another room if you have enough wire, or you  could put  a  buzzer  in  instead  of the light and catch whoever is raiding the refrigerator.__ CdS Electronic

Electronic Candles -  Here is a simple circuit that can produce the effect of candle light in a normal electric bulb.  A candle light, as we all know, resembles a randomly flickering light.  So,...__ Electronics Projects for You

Electronic Christmas Tree -  Schematic + Info + pictures __ Designed by Lennie Zink

Electronic Church Bell Controller -  This circuit is a church bell controller.  Basic component is an ATmega32 microcontroller.  At the circuit 2 24LC32 eeprom memories is being used, the 1st for internal standard melodies and the 2nd one is for user's compositions.  This feature will be provided in the future __ Designed by Antonis Pontikakis © 03.10.2007

Electronic Compass Controller -  Several Projects, scroll down.  Eventually we all want to know just where our robot is, so we can choose an absolute direction.  Usually this type of device is quite expensive.  However to our rescue comes Dinsmore with low-cost electronic compass module.  It outputs the four cardinal points and combinations thereof that will give eight directions.  I decided that combining this with tilt sensors (the Dinsmore compass will only work if not tilted more than 12 degrees) would be a cool project.  I am using a PIC 12C508 to do the dirty work and return an 8 bit number with the directional and tilt data all included____ Designed by Dennis Clark

Electronic Control for DC Motors using Discrete Bridges -  Gallery of motor-control circuits and motor-control basics __ Designed by Scott Edwards

Electronic Door Release -  The IC is a quad 2 input "AND" gate, a CMOS 4081.  These gates only produce a HIGH output, when BOTH the inputs are HIGH.  When the key wired to 'E' is pressed, current through R1 and D1 switchs Q5 on.  The relay energises; and Q5 is 'latched on' by R8.  Thus, the Alarm is set by pressing a single key, say one of the two non-numeric symbols __ Designed by Ron J.

Electronic Fluorescent Lamp Ballast -  International Rectifier App Note in PDF format

Electronic irrigation controller based on PIC -  This is a simple one-valve irrigation controller made for our greenhouse.  The code contains a software real-time clock (RTC) and a multiplexed 8-digit LED display and keyboard you can use in other projects.  Turn on the sprinkler or the aquarium lighting for the same period of the day.  You can choose to operate the output by every 2nd, 3rd day only.  There is a manual start/stop button to immediately turn on or off the output, and a disable button to completely turn off automatic operation __ Designed by Peter Jakab

Electronic KeypA - D -  The IC is a quad 2 input "AND" gate, a CMOS 4081.  These gates only produce a HIGH output, when BOTH the inputs are HIGH.  When the key wired to 'E' is pressed, current through R1 and D1 switchs Q5 on.  The relay energises; and Q5 is 'latched on' by R8.  Thus, the Alarm is set by pressing a single key, say one of the two non-numeric symbols __ Designed by Andy Collison

Electronic Load Controller for microhydro systE - M -  A key component of small water turbine installations.    __ Designed by Manfred Mornhinweg

Electronic Motor Starter -  This motor starter protects single phase motors against voltage fluctuations and overloading.  Its salient feature is a soft on/off electronic switch for easy operation.  The transformer steps down the AC voltage from...__ Electronics Projects for You

Electronic SPDT controls two PCs -  09/02/99 EDN-Design Ideas The circuit in Figure 1 is a switch that allows you to use one VGA monitor, one mouse, and one keyboard with two PCs.  The switch has four pushbuttons.  One switches the monitor between the two PCs, a second switches the mouse, a third switches the keyboard, and a fourth connects all the devices to the PC that's inactive at the moment.    __ Circuit Design by Luis Angulo, Barakaldo, SpainSeptember 2, 1999

Electronic Speed Controller for R/C Models -  Here's how you can make an electronic speed controler (ESC) for your remote control car, boat or even an airplane using an old servo and some MOSFETS

Electronic Thermostat for Fridge -  A thermostat is a standard equipment for sensing temperature of a system and maintaining it at a pre-defined point.  It is a regular feature in air-conditioners, room heaters and refrigerators.  Although...__ Electronics Projects for You

Electronic Thermostat Relay -  Here is a simple thermostat circuit that can be used to control a relay and supply power to a small space heater through the relay contacts.  The relay contacts should be rated above the current requirements for the heater.  Temperature changes are detected by a (1.7KAT70F) thermistor placed in series with a 5K potentiometer which produces about __ Designed by Bill Bowden

Electronically Generate Rotating Magnetic Fields -  18-Feb-10 EDN-Design Ideas Generate magnetic fields with a microcontroller instead of mechanical parts __ Circuit Design by F Ferrero, J Blanco, JC Campo, and M Valledor, University of Oviedo, Gijón, Spain

Eliminate thermoelectric EMF in low-ohm measurements -  06/13/02 EDN-Design Ideas When two different-metal conductors connect together in a loop and one of the junctions is at a higher temperature than the other, an electrical current flows through the loop.  The magnitude of this current depends on the type of metals involved and the temperature differential of the junctions.  When you open such a loop, a thermoelectric voltage appears across the open ends __ Circuit Design by John Wynne, Analog Devices, Limerick, Ireland

Eliminating Front-End Overload with RF AGC -  A Kenwood L-07TII I once owned had very high sensitivity on the bench. But with an outdoor antenna connected, it showed a fatal flaw: background noise on strong signals, and no hint of weak signals that other tuners received clearly. These symptoms suggested front-end overload. __ Designed by Brian Beezley K6STI

Emergency 12V Lighting Controller -  This easy-to-build project automatically turns on the power for 12V emergency lights within a second or two of a mains power failure.  Build it and you won't have to search for candles or your torch in the event of a blackout.__ SiliconChip

Emergency Backup Lamp -  This back-up lamp stays off as long as light falls on the CdS photocell from either the NE-2 or from room ambient light.  So, if the power fails at night, the lamp will light.  The 6 volt lamp should be directed away from the photocell __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Emergency Lamp & Turning Indicator -  White LEDs are replacing the conventional incandescent and fluorescent bulbs due to their high power efficiency and low operating voltage.  These can be utilised optimally for emergency lamp and vehicle turning...__ Electronics Projects for You

Emergency light flasher schematic -  If you elect to use an antenna tuner, it is extremely important that you understand exactly how to use tuners and what they can and cannot do.  A few watts of RF can easily become lost in an incorrectly adjusted antenna matching device.  The whole idea of a QRP station is to keep things simple and economical, so I cannot overemphasize the priority of a clean, efficient connection of the amplifier output to a resonant antenna.   __ Designed by Guy Roels ON6MU

Emergency Light with Charger -  White LEDs are replacing the conventional incandescent and fluorescent bulbs due to their high power efficiency and low operating voltage.  These can be utilised optimally for emergency lamp and vehicle turning...__ Electronics Projects for You

Emergency strobe flasher generates 250V -  08/05/99 EDN-Design Ideas Figure 1 shows a complete circuit for an emergency lamp that operates from a 12V automotive battery.  The xenon flash tube requires a 250V-dc anode voltage and a 4-kV trigger pulse.  To generate the 250V dc, IC1,  __ Circuit Design by Jose Luis Arce, Tecnosuma Havana, Cuba

Emergency Vehical Flasher -  There are several projects on this page.  Please scroll down to find the LED Chaser.   __ Designed by Jason KE4NYV from Roanoke, Virginia

Encoder & PC make complete Motor-control systE - M -  12-Dec-02 EDN-Design Ideas This design idea combines a simple ISA-bus-resident interface circuit; a garden-variety PC; a high-resolution optical shaft encoder; and a PWM-controlled, 0.05-hp, brushed, permanent-magnet dc motor to make a high-precision and high-power motion-control system.  The system sequences the precise rotation of an evacuated steel bell jar several feet in diameter, such as those used in molecular-beam __ Circuit Design by Steve Woodward, University of North Carolina, Chapel Hill, NC

End of Train Flasher -  Schematic + Info + pictures __ Designed by Lennie Zink

Engine Control Unit Schematics -  The original plans for the ECU called for a very simple unit designed to keep the engine within parameters.  I was going to use a Basic Stamp 2, a pressure transducer, and a thermocouple.  As work progressed, I realized that greater functionality could be obtained with a proper tachometer, and the use of a faster, more capable, compiled Microchip controller.  I will leave these circuits posted, but the final ECU will make much greater use of the inherent capabilities of the PIC16F876, 28-pin microcontroller, especially for tasks like driving the pump and the glow plug.

Ensure Safety In Power-On Operation -  04/24/03  EDN-Design Ideas Buck converter handles battery-backup systemComputers find universal use in industrial-control systems.  During power- and start-up sequences (booting], the outputs of such control systems may yield uncontrolled pulses before the  __ Circuit Design by Jean-Bernard Guiot, DCS AG, Allschwil, Switzerland

Ethernet Controller -  This circuit is an ETHERNET controller I use the PIC18F452 and the mikroC C Compiler.  I use also the JAVA SCRIPT information you can get from www.w3school.com I Control 8 outputs throw the WEB and transfer time information also. __ Designed by Antonis Pontikakis

Ethernet Interface for Automation Systems -  Communication with remotely located automation systems is possible via the Internet.  A physical communication port with a network is required for this communication.  An Ethernet interface can be used for that...__ Electronics Projects for You

Expandable 16 Stage LED Sequencer -  The circuit below uses a hex Schmitt Trigger inverter (74HC14) and two 8 bit Serial-In/Parallel-Out shift registers (74HCT164 or 74HC164) to sequence 16 LEDs.  The circuit can be expanded to greater lengths by cascading additional shift registers and connecting the 8th output (pin 13) to the data input (pin 1) of the succeeding stage.  A Schmitt trigger oscillator (74HC14 pin 1 and 2) produces the clock signal for the shift registers, the rate being approximately 1/RC.  Two additional Schmitt Trigger stages are used to reset and load the registers when power is turned on.  Timing is not critical,  __ Designed by Bill Bowden

Expandable Graphic Equaliser -  Constant Q design.  Can be made using as many or as few sections as needed __ Designed by Rod Elliott  ESP

Experimental Cross Fader -  ideas to modify simple rotary light dimmers to make a cross-fader

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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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