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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.

Convert Solar Powered Light to FlasherThe circuit converts an off-the-shelf solar powered LED path light from producing a steady state light to one that produces a flash.  This circuit includes a tiny dual Schmitt trigger inverter IC which form the pulse generator and the daylight sensor circuit.  The circuit produces a positive pulse, which feeds the constant current LED driver circuit.. . . Circuit by David Johnson P.E.-March, 2010

Cooling Fan Thermostat (12v)This circuit will turn on a 12v DC powered cooling fan when the air temperature reaches a certain high temperature and will keep the fan turned on until the temperature drops below a second lower level.  Both the high and low temperatures are both adjustable . . . Hobby Circuit designed by David Johnson P.E.-February, 2011

CT Hour MeterMany systems require routine maintenance based on machine operation time.  The circuit below is a simple way to turn on a hour meter whenever AC power is supplied to the machine.  An inexpensive snap-on current transformer from Magnetics Inc, is used to . . . Hobby Circuit designed by David Johnson P.E.-February, 2010

CW & CCW Alternating Motor DriverA while back a company needed a motor controller for a custom door latching system.    The system used a small brush motor with a speed reduction gear to both latch and unlatch the door.    When pulsed for about 250ms in the clockwise direction, the motor would unlatch the door . . . Hobby Circuit designed by Dave Johnson P.E.-September, 2010


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

Controller for Stepper Motor using 4027 flip-flop & 4070 XOR gate -  I found this circuit in my files.  I don't know where it came from, but it looks like I photocopied it from somewhere years ago.  I have been told that it came from "The Robot Builder's Bonanza", by Gordan McComb.  Anyway, I thought that it should be fairly useful, so I decided to post it here.  The circuit is very simple and inexpensive.  This is good thing because most commercial stepper motor controller ICs are quite expensive.  This circuit is built from standard components and can easily be adapted to be controlled by a computer.  If you use cheap surplus transistors and stepper motor, the price of the circuit can be kept to under $10. __ Designed by Aaron Cake

Controller IC & one-shot form resonant controller -  11/28/02 EDN-Design Ideas Resonant power supplies are popular because of high efficiency, low noise, and compactness.  You can implement a resonant buck or boost converter using a single switch.  The regulation of the output in such a converter derives from using a constant on or off time and a variable frequency.  The UC1864 controller IC(Texas Instruments, www __ Circuit Design by C Rajan, Centre for Advanced Technology, Indore, India

Controller IC halves switcher's standby power -  EDN-Design Ideas November 11, 1999    The quest for low standby power is a challenge for switch-mode-power-supply (SMPS) designers.  You can split the definition of "standby" into two facets.  In "no-load" standby, such as in a fully charged battery, output-power demand is nonexistent.    __ Circuit Design by Christophe Basso, On Semiconductor, Toulouse, France

Controller provides closed-loop temperature regulation -  05/08/97 EDN-Design Ideas Sometimes, you need to test a circuit element over temperature, but it's impossible to put the entire application circuit in the temperature chamber.  Freeze sprays and hair dryers are convenient for gross benchtop troubleshooting, but the temperature and slew rate are highly uncontrolled and may actually damage the part.  Forced-air systems are good, but they're cumbersome and expensive.  The circuit in Figure 1 uses a thermoelectric cooler (TEC) to provide closed-loop control of the element's temperature. __ Circuit Design by David Salerno, Unitrode Corp, Merrimack, NH

Controller Provides Constant Power DC LoA - D -  03/14/97 EDN-Design Ideas Circuits that draw constant power regardless of input voltage usually rely on voltage multipliers or other exotic analog functions.  The constant-power load in Figure 1, though, combines a resistive load with a simple switching po __ Circuit Design by John Wettroth, Maxim Integrated Products, Sunnyvale, CA

Controller provides multimode phase control -  12/18/97  EDN-Design Ideas Using an inexpensive 16C508 multichip controller (Figure 1), you can implement a phase controller that provIdeas a two-key, indexed processor for ac power or other discrete, digital-signal applications.  The controller provIdeas the switch-debounce function, single stepping and autostepping, index listing, and synchronization to edge transitions of the monitored ac signal or digital source.  Four modes provide flexible support in several applications __ Circuit Design by William Grill, Riverhead Systems, Littleton, CO

Controller provides multiple alarm-driver formats -  01/15/98 EDN-Design Ideas Using a piezoelectric element for alarm applications offers low cost, low power, and flexibility.  By coupling this element with a 12C508 programmable controller(Microchip Technology, Chandler, AZ], you can implement an eight-pin alarm generator.  This approach provIdeas multiple driver formats with a minimum of additional cost and footprin __ Circuit Design by William Grill, Riverhead Systems, Littleton, CO

Controller Supports Differential Monitor Display -  06/24/99 EDN-Design Ideas You can assemble a differential monitoring display using rail-to-rail analog hardware and a 12C671 eight-pin controller(Microchip Technology, www.microchip.com)(Figure 1).  The controller, IC1,  __ Circuit Design by William Grill, Riverhead Systems, Littleton, CO

Controlling a Light with Two Switches -  a light or lights can be controlled by more than1-switch

Controlling a Robotic Car through MatlAB Gui -  This project presents the implementation of a MATLAB based graphical user interface (GUI) to control the movement of a robotic car.  The commands to move the car in forward, reverse, right...__ Electronics Projects for You

Controlling a Stepper Motor using a Rotary Encoder -  Presented here is a project to control a stepper motor using an incremental rotary encoder.  It consists of a Raspberry Pi (Raspi) board, 5-pin rotary encoder, 5V stepper motor and an...__ Electronics Projects for You

Controlling a Variable Voltage Power Supply using the DS1809 Pushbutton Control -  App Note #1035__ Maxim Integrated

Controlling Devices through Webiopi Interface -  In the evening, with the day’s work over, your office is locked and you are about to leave for home.  Suddenly, you notice that some of the lights in your office...__ Electronics Projects for You

Controlling Relays with Logic Voltages -  The schematic below illustrates 4 methods of controlling a relay with a digital logic signal.  Figure (A) can probably be used in most cases where the relay coil requires 100 mA or less and the input current is 2 milliamps or more.  The resistor value (R) is determined from the input voltage and the available current.  For example, a 5 volt input signal supplying 2 milliamps would require (5-.7)/.002 = 2150 ohms, or a 2.2K standard value.   __ Designed by Bill Bowden

Controlling slew times tames EMI in offline supplies -  14-Nov-02 EDN-Design Ideas EMI from offline switching power supplies typically causes all sorts of problems for power-supply designers.  You may need a large EMI filter to meet FCC emission requirements.  Switchers for high efficiency produce high-frequency switching noise that can propagate through the rest of the system and cause problems __ Circuit Design by David Canny, Linear Technology Corp, Milpitas, CA

Controlling Stepper Motor with a Parallel Port -  This is an easy to build stepper motor driver that will allow you to precisely control a unipolar stepper motor through your computer's parallel port.  With a stepper motor you can build a lot of interesting gadgets such as robots, elevator, PCB drilling mill, camera panning system, automatic fish feeder, etc.  If you have never worked with stepper motors before you will surely have a lot of fun with this project. __ Designed by Electronics-DIY

Controlling TDMA Timeslot Power Levels using the Esg-D Series, RF Signal Generators -  Application Note__ Aligent

Controlling the temperature of fiber-optic lasers -  07/05/01  EDN Technical Article: Thermoelectric-cooler-based temperature controllers have some unusual requirements.  They account for circuit- and thermal-design characteristics to provide climatic pampering for temperamental lasers.   __ Circuit Design by Jim Williams, EDN's most revered contributor, passed away in June 2011 after a stroke.  He was 63.

Controlling your SLR Camera from an Ipod -  How to control your camera shutter release from your Ipod (r) or other MP3 player.   __ Designed by © 20142003 Paulo Oliveira'

Convert 1 to 5V signal to 4-to 20-mA output -  04/19/12  EDN-Design Ideas Despite the long-predicted demise of the 4- to 20-mA current loop, this analog interface is still the most common method of connecting current-loop sources to a sensing circuit.  This interface requires the conversion of a voltage signal—typically, 1 to 5V—to a 4- to 20-mA output.  Stringent accuracy requirements dictate the use of either expensive precision resistors or a trimming potentiometer to calibrate out the initial error of less precise devices to meet the design goals.   __ Circuit Design by Thomas Mosteller, Linear Technology Corp

Convert Digital Mains Timer to Low Voltage -  Convert a cheap digital mains timer into a low voltage programmable timer relay.   __ Designed by REUK-Renewable Energy UK website

Convert Solar Powered Light to Flasher -  The circuit converts an off-the-shelf solar powered LED path light from producing a steady state light to one that produces a flash.  This circuit includes a tiny dual Schmitt trigger inverter IC which form the pulse generator and the daylight sensor circuit.  The circuit produces a positive pulse, which feeds the constant current LED driver circuit.. . . Circuit by David Johnson P.E.-March, 2010

Cooling Fan Controller -  As we begin to enjoy those lazy hazy days of summer, the most important thing on most of our minds is how to keep cool during those hot days.  For some of us that means turning up the old air conditioner and sipping on a nice cold glass of our favorite soft drink.  However, we often forget about an equally important __ Designed by Radio Amateur Society of Norwich

Cooling Fan Thermostat (12v) -  This circuit will turn on a 12v DC powered cooling fan when the air temperature reaches a certain high temperature and will keep the fan turned on until the temperature drops below a second lower level.  Both the high and low temperatures are both adjustable . . . Hobby Circuit designed by David Johnson P.E.-February, 2011

Correct Voltage Drop & Phase Shift In Transmission Lines -  20-Mar-03 EDN-Design Ideas Synchronous buck circuit produces negative voltageMany precision test-and-measurement and high-speed analog applications require an exact targeted voltage to be delivered to the device under test or intended load to accurately analyze the device.  Design and test engineers are well-aware that this goal is sometimes unattainable, because the impedance across the traces delivering the signal to the load alters the original signal __ Circuit Design by Ron Shakery, Texas Instruments, Dallas, TX

Correlator Works In Presence Of Noise -  20-Mar-03 EDN-Design Ideas Many precision test-and-measurement and high-speed analog applications require an exact targeted voltage to be delivered to the device under test or intended load to accurately analyze the device.  Design and test engineers are well-aware that this goal is sometimes unattainable, because the impedance across the traces delivering the signal to the load alters the original signal __ Circuit Design by Ron Shakery, Texas Instruments, Dallas, TX

Courtesy Light -  Two LED-eyes follow the rhythm of music or speech; 3V Battery-operated device suitable for pins or badges __ Contact: Flavio Dellepiane, fladello @ tin.it

Courtesy Light Delay for Cars -  Simple circuit has an adjustable delay from 7-40s and fades the lights out at the end of the delay period.  And the same circuit suits all cars.__ SiliconChip

Creating a Constant Envelope Signal using the ADL5331 RFVGA & AD8319 Log Detector  -  Decreasing the DAC code, which corresponds to demanding a higher signal from the ADL5331, tends to increase GAIN.  In order for the AGC loop to remain in equilibrium, the AD8319 must track the envelope of the ADL5331 output signal and provide the necessary voltage levels to the ADL5331’s gain control input__ Analog Devices from the Lab

CT Hour Meter -  Many systems require routine maintenance based on machine operation time.  The circuit below is a simple way to turn on a hour meter whenever AC power is supplied to the machine.  An inexpensive snap-on current transformer from Magnetics Inc, is used to . . . Hobby Circuit designed by David Johnson P.E.-February, 2010

Cupboard Light -  Here is a simple circuit that can temporarily illuminate your cupboard or other such usually dark places where mains connection is either not possible or not worthwhile.  The circuit is nothing...__ Electronics Projects for You

Current Limiting Bench Power Supply -  Power Supply Circuits:  This is a 1-amp variable-voltage PSU.  It adjusts from about 3v to 24v: and has the added feature that you can limit the maximum output current.  This is invaluable when   (for example) you power-up a project for the first time or soak-test a piece of equipment.  __ Designed by Ron J.

Current Loop Interface -  This is a very simple circuit to interface a current loop sensor to an input which is designed for a voltage, such as that from a standard potentiometer.  This page is technical so that interested persons can build the circuit themselves, but 4QD can also supply the interface on a 'postage stamp' sized (22mm x 27mm) board as shown in the first diagram.  It is a relatively trivial circuit!  __ Designed by Richard Torrens

CW & CCW Alternating Motor Driver -  A while back a company needed a motor controller for a custom door latching system.    The system used a small brush motor with a speed reduction gear to both latch and unlatch the door.    When pulsed for about 250ms in the clockwise direction, the motor would unlatch the door . . . Hobby Circuit designed by Dave Johnson P.E.-September, 2010

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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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