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


Last Updated: October 24, 2017 02:55 PM

Circuits Designed by Dave Johnson, P.E. :

Ten-LED Sequential Flasher using Low PowerA 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. . . Circuit by David A. Johnson P.E.-April, 2011

Three Volt Universal LED FlasherThe 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, white and . . . Hobby Circuit designed by David Johnson P.E.-June, 2008

Three-Minute Closet LightI have a coat closet by my front door.  The thing is very dark at night and really needs some kind of illumination inside.  I could hire an electrician to install a light in the closet ceiling and then wire it to a toggle switch outside the door but that would cost me quite a bit of money. . . Circuit by David A. Johnson P.E.-December, 2011

Three-Volt Low Battery Voltage FlasherMany battery powered devices use two AA alkaline cells.  Often you will not know when it is time to replace the batteries until the device powered by them actually stops operating.  The hobby circuit below can be connected to a 3v battery, to give you some . . . Hobby Circuit designed by David Johnson P.E.-January, 1998

Three-Volt Powered Super Bright LED FlasherI have posted several kinds of LED flashers over the years.   This is yet one more flasher, designed to flash any high power LED of any color.  It hits the LED with a 25ms 250ma pulse once every 2 seconds.   This works out to an average current about 3ma.  It . . . Hobby Circuit designed by David Johnson P.E.-April, 2009

Touch Activated SwitchThis circuit provides about one watt of non-isolated DC power for an automotive type 12v LED array lamp in addition to a standard incandescent table lamp.. . . Circuit by David A. Johnson P.E.-January, 2002

Transmitter for Line Powered Xenon FlashThis 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 . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

Ultra Low Current 3v LED Flasher #5This circuit takes advantage of a tiny LMC7215 low current draw voltage comparator from National Semiconductor and a super efficient green LED from King Bright.  The 3v powered circuit forms a classic pulse generator circuit, which drives the LED.  The pulse width is set at about 20ms, the pulse rate is about 0.5Hz and the peak LED current is only 100ua. . . Circuit by David A. Johnson P.E.-February, 2011

Universal Flasher using a Latching RelayLatching relays are nifty devices.  Most contain two separate coils.  When a voltage is applied to one coil the relay latches in one state and stays in that state until voltage is applied to the unlatch coil.  Since the latching and unlatching pulses only . . . Hobby Circuit designed by David Johnson P.E.-October, 2005

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 A. Johnson P.E.-July, 2006

Universal-3v-LED-FlasherThe 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, white and. . . Circuit by David A. Johnson P.E.-June, 2008

Up/Down Ramping Light Pushbutton ControlThere are times when you want a lamp to gradually change from dark to light and from light to dark, with each push of a pushbutton switch.  The circuit below performs this control function using a flip/flop and a classic pulse width modulation or PWM. . . Circuit by David A. Johnson P.E.-March, 2009

Version a of 1.5v LED FlasherTo 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. . . Circuit by Dave Johnson P.E.-June, 2000

White LED Array that is Lined PoweredThere 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 . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2010

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

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

Xenon Lamp Flash Detector AmplifierThis circuit has a very low standby current requirement yet has very high sensitivity toward the light flashes from a xenon lamp.  When connected to a flip/flop it can serve as an on on/off Controller. . . Circuit by David Johnson P.E.-December, 2004

Xenon Photoflash ControllerThis 9v battery powered circuit is designed for remote control flash needs.  A charge control circuit turns off the high voltage generator when the photoflash capacitor is fully charged.  A neon lamp is included to indicate when the system is ready to flash. . . Circuit by David Johnson P.E.-June, 2000


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

Valentine Heart -  18 LEDs flash at three different rates and you can use these to create an eye-catching Valentine Heart for that special person! A template for the heart shape can be downloaded.  The circuit is kept simple  (and low cost) by using the 4060B IC which is a counter and oscillator  (clock) in one package.  The circuit requires a 9V supply, such as a PP3 battery __ Designed by John Hewes

Varying Brightness AC Lamp -  In this circuit, an SCR is used to slowly vary the intensity of a 120 volt light bulb by controlling the time that the AC line voltage is applied to the lamp during each half cycle.  The circuit is directly connected to the AC power line and should be placed inside an enclosure that will prevent direct contact with any of the components.  To avoid electrical shock, do not touch any part of the circuit while it is connected to the AC power line.  A 2K, 10 watt power resistor is used to drop the line voltage down to 9 volts DC.  This resistor will dissipate __ Designed by Bill Bowden

Version a of 1.5v LED Flasher -  To 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. . . Circuit by Dave Johnson P.E.-June, 2000

Video Design Idea: 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

Voltage Reference Stabilizes Current Sink -  18-Feb-10 EDN-Design Ideas Produce a stable current for long-term component testingAnalog circuits for long-term testing of passive components, such as 0.1%-tolerant resistors or high-intensity white LEDs, often require a constant current.  Using two op amps and a voltage reference, you can develop a circuit that provIdeas a constant-current sink with a variable setting of 0 mA to 0.99A.  The circuit in Figure 1 sinks a stable current through the load.  The load current is insensitive to power-supply-voltage variations.    __ Circuit Design by Suded Emmanuel, Emmanuel’s Controls, Auckland, New Zealand

Voltage Regulator controls scanner Lamp brightness -  05/13/99 EDN-Design Ideas An image-scanning device performs best when the scanner IC controls the brightness of the image reflected into the light sensors.  The best way to control brightness is by adjusting the intensity, or light output, of the fluoresce __ Circuit Design by Chester Simpson, National Semiconductor, Santa Clara, CA

Welch Scientific Model 2153C Stroboscope -  Here is a schematic for a typical line operated variable rate stroboscope.  This unit is from Welch ScientificModel 2153C Stroboscope.  These things typically gather dust in the dusty dark corners of high school physics labs.   __ Designed by Don Klipstein

White LED Array that is Lined Powered -  There 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 . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2010

White LED driver provides 64 step logarithmic dimming -  10-Jun-04 EDN-Design Ideas The circuit of Figure 1 is designed for portable-power applications that require white LEDs with adjustable, logarithmic dimming levels.  The circuit drives as many as four white LEDs from a 3.3V source and adjusts the total LED current from 1 to 106 mA in 64 steps of 1 dB each.  The driver is a charge pump that mirrors the current ISET (sourced from IC3's SET terminal] to produce a current o __ Circuit Design by William Hadden, Maxim Integrated Products, Sunnyvale, CA

White LED Head Lamp -  A white LED head lamp which can operate with only two AA batteries.  The LEDs are driven in constant current, so that the brightness is maintained until end of battery life.   __ Designed by The Electronic Lives Manufacturing-presented Chan

White LED Stroboscope with Constant Duty Cycle & Constant Current Drive  -  Finally, white LED's are bright enough to use in a practical stroboscope.  This circuit can operate as a bench-top stroboscope that, in conjunction with an oscilloscope or frequency meter and bench top power supply can accurately measure rotational speeds, or it can be operated hand-held from a single 9V battery,  __ Designed by Dick Cappels

White LED-Based 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

White-LED Driver Touts High Efficiency -  12-Jun-03 EDN-Design Ideas White LEDs, the most recent addition to the LCD backlight, find common use in providing backlight for color LCDs.  Thanks to their size and white-light output, they appear in small, portable devices with color displays, such as PDAs and cellular phones.  Like other LEDs, a white LED needs a constant-current source—typically, on the order of 15 to 20 mA __ Circuit Design by Dimitry Goder, Sipex Corp, San Jose, CA

White-LED flasher operates from one cell -  05/26/05  EDN-Design Ideas 1.5V circuit flashes white LED __ Circuit Design by Anthony H Smith, Scitech, Biddenham, England

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

WINAMP & Disco Lights -  Have you ever wanted to set up Disco Lights for your parties? DiscoLitez could be the answer  __ Designed by Jim Fuller

Wireless bicycle brake light -  04/17/14  EDN-Design Ideas The TI LDC1000 senses bike wheel rotation and controls a stop light.  My submission video shows the new Texas Instrument's LDC1000 attached to the rear wheel fork of a bicycle, where it senses the spokes as the wheel rotates.  This proof-of-concept demonstration shows how perfect this sensor is for my goal of an improved bicycle brake light that has many advantages.  I'm passionate about getting this invention completed and on the market as soon as possible, where it can help prevent some of the many injuries and deaths to the hundreds of millions of the world's bicyclists each year.   __ Circuit Design by John Craig

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

Xenon flash valve -  An experiment of the xenon flash valve.   __ Designed by The Electronic Lives Manufacturing-presented Chan

Xenon Flasher -  You are going to like this project.  It costs less than $3.00, contains six BUI - LDING BLOCKS, re-cycles a disposable flash camera and you are going to learn a lot about electronics. 
Everyone has seen a disposable flash camera.   __ Designed by Collin Mitchell

Xenon Lamp Flash Detector Amplifier -  This circuit has a very low standby current requirement yet has very high sensitivity toward the light flashes from a xenon lamp.  When connected to a flip/flop it can serve as an on on/off Controller. . . Circuit by David Johnson P.E.-December, 2004

Xenon Photoflash Controller -  This 9v battery powered circuit is designed for remote control flash needs.  A charge control circuit turns off the high voltage generator when the photoflash capacitor is fully charged.  A neon lamp is included to indicate when the system is ready to flash. . . Circuit by David Johnson P.E.-June, 2000

Xenon Strobe Light -  A xenon flash tube is a triggered gas discharge device.  A voltage may be impressed across the tube and it will not conduct until the xenon gas is ionised by an external high voltage  (typically 3 to 5kV) .  Once triggered, the gas becomes a very low impedance, and discharges the storage capacitors in about 1ms  (this varies considerably, but this figure is fine for basic calculations)  __ Designed by Rod Elliott  ESP

Xenon Strobe Light -  Disco anyone? Actually, this strobe serves a much more useful purpose then making it look cool when you dance in the dark.  You can use it to view fast moving objects, look for craks in PC boards  (hold the strobe on the trace side of the board and look from the component side) , and it is a great attention getter in a store window __ Designed by Aaron Cake

Xmas Lights Tester -  Like every year around the same time, I hurried to get my Christmas tree all set up and the first thing we do when the tree is 'standing' we like to hang the lights in the tree.  Okay, better first test them before putting all 50 of them in the tree.  Yep! Working beautifully.  I started a carefully planned organization of the lights so they would be evenly divided over the branches.  Now the second string of lights, tested, yep working.  In the tree with them.  Putting the plugs into the receptacle andoh no-- one series of them are on in full glory, all the others are out.  Annoyed I tried to 'fix them' by trying to push each bulb further into their sockets.  Still no go __ Designed by Jan Hamer

XXI Century Sundial-NoW for Arduino also -  This is a simple project of a sundial wherein the pinion is replaced by a line LASER I took from a LASER level.  The LASER is mounted on a RC servo which in turn is driven by a micro controller.  The micro controller keeps the time and turns the RC __ Designed by Radio LocMan

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

 


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