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Lamp / Light Control Circuits
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Last Updated: December 30, 2017 02:13 PM

Circuits Designed by Dave Johnson, P.E. :

LED Driver-WirelessThe circuit solves this problem by sending power to the LED through the plastic, using a magnetic coupling technique.  The circuit below can route power through plastic enclosures as thick as ¼ inch.  The circuit will not work through metal boxes . . . Hobby Circuit designed by David A. Johnson P.E.-November, 2008

LED Flasher needs only 1.5 VOLTSTo squeeze even more energy from a alkaline battery cell, this circuit adds two transistors to a circuit similar to the above design to boost the efficiency.  A small 1.5 volt alkaline N cell should flash the LED for a full year.  It too uses a "charge pump" technique to provide a LED the needed voltage . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

LED Flasher that is Battery FreeLED flashers have been used for a wide variety of applications.  Some flasher units have been used in food and hardware stores, to draw attention to sale items and are often attached to boxes which dispense product discount coupons . . . Hobby Circuit designed by Dave Johnson P.E.-December, 2010

LED Flasher Universal 3vThe electronic circuit below will flash any LED color with fixed current pulses powered by a 3v battery.  It uses a charge pump approach, which routes a constant current pulse through the LED, regardless of the LED voltage requirement.  Using this approach . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2008

LED Flasher-Wig/WagThis simple circuit will flash two LEDs in an alternating fashion . . . Hobby Circuit designed by Dave Johnson P.E.-December, 2004

LED Flasher-Wireless CircuitWhen you would like to flash a LED through a thick plastic case without wires, use this hobby circuit.  It performs this feat.  It draws about 300ua of average current at 5v.  It can be powered from a supply ranging from 3v to 6v . . . Hobby Circuit designed by David A. Johnson P.E.-January, 2011

LED Flashing Badge #1I have seen numerous flashing light badges at trade shows and conventions.  They are often handed out as gifts to promote some business.  The devices often use inefficient circuits, which cause the battery power source to be quickly depleted. . . Circuit by David A. Johnson P.E.-March, 2002

LED Flashing Badge #2This circuit uses a CD4013 dual D Flip/Flop IC.  A single lithium battery will provide months of continuous LED flashing.  It also has a tiny push-button switch to turn on and off the light flashing. . . Circuit by Dave Johnson P.E.-March, 2002

LED Lighthouse Flasher for HO Model Train  - HO train sets often have authentic looking scale model homes and buildings.  The hobby circuit below can be mounted inside a model lighthouse.  The electronic circuit drives a single LED lamp in such a way that it produces light which simulates the rotation . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

Light to Frequency ConverterThis circuit uses a CMOS version of the classic 555 timer, to form a light intensity to frequency converter.  A small PIN photo diode is used as the light detector.  The pulses produced are short, so in some applications you may want to stretch them or . . . Hobby Circuit designed by Dave Johnson P.E.-May, 2008

Light/Dark 12V SwitchOften, for certain low voltage lighting systems; you would like to turn off the lights during the bright light of the day.  Most commercial day/night switches are designed for AC lighting.  The circuit below was designed for a 12v DC system.  But, it could be modified for other voltage as well.  It uses an inexpensive phototransistor as the light detector.. . . Circuit by David Johnson P.E.-June, 2008

Lighthouse LED  FlasherThis was originally designed for a model in a HO train set.  It simulates the behavior of the light from a lighthouse.  The LED intensity gradually increases, then flashes with a bright light and finally decreases slowly in intensity . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

Lighthouse LED FlasherThis was originally designed for a model in a HO train set.  It simulates the behavior of the light from a lighthouse.  The LED intensity gradually increases, then flashes with a bright light and finally decreases slowly in intensity. . . Circuit by David Johnson P.E.-July, 2006

Line Powered High Intensity LED FlasherThere are times when you would like to generate an intensely bright flash of light using electrical power from the AC line.  The circuit below can drive a one to three watt power LED with about 350ma of peak current.  Since the circuit drives the LED with . . . Hobby Circuit designed by David Johnson P.E.-December, 2008

Line Powered White LED ArrayThere has been a lot of excitement lately in the lighting industry.  Some companies are beginning to manufacture general lighting fixtures, which replace incandescent and fluorescent lamps, using LED lights.  When proper heat management is designed. . . Circuit by David A. Johnson P.E.-February, 2010

Line-Powered Xenon Flash TransmitterThis line powered xenon flash circuit drives a small camera type flash tube.  It has an optical isolator to allow the flash to be safely triggered from some remote device.  A flash rate of 2Hz is possible with the circuit. . . Circuit by David A. Johnson P.E.-June, 2000

Low Battery Voltage FlasherThis circuit is designed to monitor two alkaline cells (3v) that form the battery often used in portable electronic equipment. . . Circuit by David A. Johnson P.E.-January, 1998

Low Current Flashing LED Power Indicator This circuit flashes a power indicator LED to keep the average current low . . . Hobby Circuit designed by David Johnson P.E.-June, 2000

Low Power LED FlasherJudging from the numerous references I have received, this electronic circuit, hobby circuit seems to be rather popular.  Many published circuits which flash LEDs need 3 or more volts.  This electronic circuit uses only a single inexpensive C-MOS IC and . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

Low Power Sequential Flasher using 10 LEDsA while back I posted a flasher circuit which flashed 10 LEDs sequentially.  That circuit was powered by four AA alkaline cells.  The circuit below operates much the same way but has been modified to run from a single 3v CR2032 lithium coin cell . . . Hobby Circuit designed by David A. Johnson P.E.-April, 2011

Low Power Universal LED FlasherThis low power LED flasher circuit draws about 100ua from any DC power supply ranging from 3 volts to 24 volts.  The 1.0Hz 10ms LED pulsed current is held to a constant 10ma. . . Circuit by David Johnson P.E.-July, 2006

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

LED Modulations (2 versions) -  Common Light Emitting Diodes  (LEDs) require a DC forward bias current of 10 to 20 mA for proper operation.  Typically the maximum DC current is 30 to 50 mA.  The color of light  (or wavelength λ) emitted from an LED depends on the semiconductor material used to fabricate the LED and this in turn determines the LED forward voltage at the operating current. __ Designed by M. Gallant

LED Mood Light -  This circuit makes a nice lamp that consumes little power, runs cool, and has an incredibly long lifetime.  The lamp puts out a warm yellow shade of light, the color may be adjusted by changing the number of red or green LED strings.   __ Designed by Forrest Cook

LED or Incadescent 12 Volt Lamp Fader -  This circuit is similar to the "Fading Red Eyes" circuit    (in the LED section) used to fade a pair of red LEDs.  In this version, the lamps are faded by varying the duty cycle so that higher power incandescent lamps can be used without much power loss.  The switching waveform is generated by comparing two linear ramps  __ Designed by Bill Bowden

LED or Lamp Flasher -  Minimum parts countingImproved version; 3V battery operation __ Contact: Flavio Dellepiane, fladello @ tin.it

LED or Lamp Pulser -  Astonishing effect; 4.5V supply __ Contact: Flavio Dellepiane, fladello @ tin.it

LED Pilot Light (AC or DC) -  LED current is constant between 6 and 8 mA at5 to30Vdc.   __ Designed by Tony van Roon  VA3AVR

LED power supply has battery backup -  Power three to six LEDs from an ac- or dc-power source and charge a backup battery.  LEDs find wide use in emergency lighting because of their high efficiency __ Designed by Zhihong Yu, Juno Lighting Group, Des Plaines, I - L;

LED senses & displays Ambient light intensity -  09/05/07  EDN-Video Design IdeasExplains how an LED can double as a photosensor and a visual indicator of ambient-light intensity __ Circuit Design by Dhananjay V Gadre of India's Netaji Subhas Institute of Technology

LED senses & displays Ambient-light intensity -  11/09/06  EDN-Design Ideas LED doubles as photosensor and visual indicator of ambient-light intensity __ Circuit Design by Dhananjay V Gadre and Sheetal Vashist, ECE Division, Netaji Subhas Institute of Technology, New Delhi, India

LED Sequencer -  The model 4017 integrated circuit is a CMOS counter with ten output terminals.  One of these ten terminals will be in a "high" state at any given time, with all others being "low, " giving a "one-of-ten" output sequence.  If low-to-high voltage pulses are applied to the "clock"  (Clk) terminal of the 4017, it will increment its count, forcing the next output into a "high" state __ Designed by © EETech Media, LLC.

LED Sequencer -  This circuit is the essence of many "chaser" schemes that provide animation in advertising displays, lighting ten LEDs sequentially.   __ Designed by Arthur Harrison

LED Solar Lantern Lights -  Circuit of the LED solar lantern lights presented here is built around one 6V/1W Solar Panel  (PhotoVoltaic Panel) and a 4V/800mAh Lead-Acid Battery.  Here, commonly available 5mm White Straw Hat LEDs are used as the light source.  how does the solar lantern circuit works DC 6V supply from the solar panel is fed to the __ Designed by T.K. Hareendran

LED Strobe -  with high power led's available, their replacement for a xenon tube is viable! __ Contact: P. Townshend EduTek Ltd

LED Strobe & Contactless Tachometer -  This versatile LED Strobe & Tachometer can be used to observe and measure the RPM of rotating machinery.  It offers three different measurement methods and the readout is via a 2-line LCD module.__ SiliconChip

Led Strobe & Tacho Pt.2 -  Last month, we published the circuit of our new LED Strobe & Tachometer and showed how to build the main unit and the strobe light.  This month, we describe the assembly of the optional Photo-Interruptor and IR Reflector Amplifier boards.  We also describe how the unit is used.__ SiliconChip

LED Strobe Flasher -  This little circuit provides a surprisingly spectacular bright strobe flash which is adjustable with P1, the 200K trimmer potentiometer.  P1, R1, R2, and C1 provide the flashrate.  R1 sets the upper flashrate.  The flashrate for the above circuit was measured at 12Vdc.  If the supply voltage is steady or regulated, the flashrate is very stable. __ Designed by Tony van Roon  VA3AVR

LED Strobe Has Independent Delay & Duration -  11-Jun-09 EDN-Design Ideas High-brightness LEDs, with independent delay and duration, find use in a visual-inspection application __ Circuit Design by Michael C Page, Chelmsford, MA

LED Strobe Light -  Schematic + Info + pictures __ Designed by Lennie Zink

LED Torch -  Based on the MAX660, designed to power three 3mm/5mm white LED's from 3V  (1.5V min) , intended for replacing incandescent bulbs in small torches.   __ Designed by Submitted Andre

LED Torch -  A common problem with small torches is the short life-span both of the batteries and the bulb.  The average incandescent torch, for instance, consumes around 2 Watts.  The LED Torch in Fig.1 consumes just 24 mW, giving it more than80 times longer service from 4 AA alkaline batteries  (that is, up to one month's continuous service)  __ Designed by Rev Thomas Scarborough

LED Torchs -  A LED torch is one of the simplest projects you can build and it's very interesting as it uses a super-bright white LED.  In the history of LED production, red LEDs were the first to be invented and their output was so dim you could barely see if they were illuminated.  You needed a darkened room to see them at all __ Contact: Collin Mitchell

LED Traffic Lights -  The LED traffic Light circuit controls 6 LEDs  (red, yellow and green) for both north/south directions and east/west directions.  The timing sequence is generated using a CMOS 4017 decade counter and a 555 timer.  Counter outputs 1 through 4 are wire ORed using 4 diodes so that the  (Red, North/South) and  (Green, East/West) LEDs will be on during __ Designed by Bill Bowden

LED used for near-IR light -  09/01/98 EDN-Design Ideas NOTE :  File has many circuits, scroll down.  You can successfully use LEDs as sources of near-infrared light.  However, when you need a source of light with precisely controlled power, a feedback loop is necessary to compensate for the temporal and thermal changes of the LED parameters.  Standard LED types come with neither these monitoring detectors nor an external monitoring photodiode to detect part of the emitted light and generate a feedback signal.  The situation calls for some mechanical fixture to mount the photodiode. __ Circuit Design by Lukasz Sliwczynski, Marcin Lipinski, Institute of Electronics, Krakow, Poland

LED Blinker uses 4 parts -  EDN-Design Ideas March 26, 1998    [ NOTE : File has multiple design, scroll for this one.]   The circuit in Figure 1 is an easy-to-make attention-getter and runs for a week or longer on two AA cells. In September, I used this circuit for a school fundraiser, and it helped me generate more than $100. My dad showed me a circuit in EDN that did the same thing, but it uses more parts  (see "Alternating LED flasher uses minimal parts," EDN, Nov 20, 1997, pg 104) . __ Circuit Design by Andy Meng, Cincinnati, OH

Led Strobe 2 -  this version has been built and tested and is very simple indeedbased on alien project astable! __ Contact: P. Townshend EduTek Ltd

LED7 Solar Tracker -  Schematic only, no circuit description __ Contact: Duane C. Johnson

LED-flashlight works at voltages as low as 0.5V -  09/23/10 EDN-Design Ideas Extend the life of alkaline batteries.    __ Circuit Design by GY Xu, XuMicro, Houston, TX

LEDs Flasher Alternately -  Classic astable multivibrator using 2 transistors.  Transistor is not critical.  Try these: 2N4401, 2N2222, NTE123A, NTE123AP, NTE159, TUP/TUN and those in your junk box, you may find that most of them will work.   __ Designed by Tony van Roon  VA3AVR

LEDs or Lamps Sequencer -  Very simple, versatile modular design No limits to the number of modules used in the ring __ Contact: Flavio Dellepiane, fladello @ tin.it

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 a white LED from half a cell -  12-Jun-03 EDN-Design Ideas Whether you use them as indicators or to provide illumination, LEDs are hard to beat in efficiency, reliability, and cost.  White LEDs are rapidly gaining popularity as sources of illumination, as in LCD backlights, but with forward voltages typically ranging from 3 to 5V, operating them from a single cell presents obvious difficulties __ Circuit Design by Anthony Smith, Scitech, Biddenham, Bedfordshire, UK

Light an LED without wasting energy -  The circuit in Figure 1 can minimize this waste by using an inductor and an oscillating circuit to control the current through the LED—energy that would otherwise go to waste.  Inductor L1 stores power and channels it back into the LED.    __ Circuit Design by Raju R Baddi, Tata Institute of Fundamental Research, Maharashtra, India; Edited by Martin Rowe and Fran GranvilleApril 21, 2011

Light Bouncer -  A simple chaser from a decade counterbounces a light on 6 bulbs __ Contact: P. Townshend EduTek Ltd

Light bulb timer -  The circuit is rather small and could be housed in the same case as the push button, if there is enough room.  Of course you have to substitute the standard switch with a push button.  Operation with a 110Vac mains has not been tested although I expect that a 100μF 100V capacitor instead of the 47μF capacitor should do the trick

Light Bulb Voltage Regulator  -  The LVR2 and LVR3 work by Pulse Width Modulating the battery voltage and applying that to the light bulb.  In simplier terms it turns the light on and off so fast that the bulb appears to burn smoothly.  The LVR adjusts the time on versus the time off precisely, so that can the bulb maintains the same brghtness even as the battery voltage drops, until the battery voltage is the same as the bulb voltage.  At that point the LVR is on 100% of the time and the bulb grows dimmer with further battery drop. __ Designed by Willie Hunt

Light Chaser -  Schematic only __ Designed by Andres de la Plaza

Light Control Switch -  This is a simple LM311 Comparator based switch which can be used for various purposes: __ Designed by Nina Gajjar

Light Control SystE - M -  It is easy to install a couple of infrared emitter and receiver at the entrance of your room and maybe you connect them to the light, but you cannot control the light in this way! You will never know how many person inside and if the room is empty or not.  In this system, every thing is under control, because it is smart enough to know how many persons inside; and it can identify the direction of them, so the light will be turned OFF when the room is unoccupied; and ON otherwise! __ Contact: IQ Technologies

Light Controlled Switch -  Output a control signal suitable for relay depending on the light level

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Lamp Controls:   #'s - B       C - K       L - M       N - S       T-Z

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