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Light Flasher Circuits
Light Flashers:  #'s - B        C - K        LO        P - S         T - Z


Last Updated: October 24, 2017 02:55 PM

Circuits Designed by Dave Johnson, P.E. :
Super Bright 3v Powered 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. . . Circuit by David Johnson P.E.-April, 2009

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

Safety Flasher -  This circuit alternately flashes two high-brightness LEDs as a safety measure during jogging or walking.  The LED’s can be mounted on clothing or a belt.  The circuit draws a precisely controlled 10mA in order to conserve battery life.  Also, the battery vol __ Designed by Andrew R. Morris

Safety flasher warns of high voltage -  02/17/14EDN-Design Ideas A low power circuit warns the user that high voltage is presentWorking on high voltage circuits can be dangerous.  Capacitors can maintain high voltage in a system for a considerable time after power is removed __ Circuit Design by Clive Bolton

SCR Flipflop for Alternating Flashing Light Bulbs -  Schematic only __ Designed by G.L. Chemelec

Sequencing Neons Ne 51/Ne 2 -  This circuit is similar to the LED clock using 12 neon indicator lamps instead of LEDs.  It operates from 2 high capacity ni-cad cells    (2.5 volts) which keep it going for a couple weeks.  High voltage    (70 volts) for the neon lamps is obtained from a small switching power supply using a 74HC14 Schmitt trigger squarewave oscillator, high voltage switching transistor __ Designed by Bill Bowden

Sequential Bar Graph Turn Light Indicator for Car -  The article illustrates a simple yet innovative, fancy car turn signal light circuit which produces a rising bar graph sequence effect when switched ON. __ Designed by Swagatam Majumdar

Sequential Brake/Turn Lights -  Bar-mode LED-cluster sequencer.  Can drive up to 16 clusters.   __ Contact: Flavio Dellepiane, fladello @ tin.it

Sequential Flasher -  Scroll to find this one.  Here is an unusual flasher circuit for 120VAC loads.  The circuit is similar to the two-transistor flasher seen in several circuits in techlib.  com except that an SCR is used __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Sequential LED Flasher -  for 10 LEDs.   __ Designed by Tony van Roon  VA3AVR

Silent Metronome -  File contains several designs, please scroll to find this circuit.  The circuit below is a "silent" metronome that keeps the beat without becoming a member of the band.  The circuit flashes the 6 volt lamp at a rate set by the 20k potentiometer which can have a dial for setting the desired tempo.  Alternately, the potentiometer could be replaced with a rotary switch and selected resistors.  The lamp is an ordinary #47 bulb which will give good omni directional brightness but an LED and resistor could be used insteadtry a 100 ohm in series with a   high-intensity LED.  The batteries could be three C or D cells for good life.  This circuit could be used to generate "clicks" in a speaker but such metronomes are not particularly pleasing.  The ambitious might replace the lamp with a solenoid which taps on the wall of a hardwood box or wooden chime for a "professional" sound.   __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Simple Circuit Color Organ -  A simple, satisfactory Color Organ can be built with a handful of cheap components.  This design features: no mains supply transformer, built-in microphone and three widely adjustable frequency bands obtained by means of very simple, passive filters for Bass, Middle and Treble __ Contact: Flavio Dellepiane, fladello @ tin.it

Simple Circuit Colour Organ -  This is a simple, one lamp colour organ.  It is far less complicated then the Three Channel Colour Organ.  It is simply a lamp controlled by an SCR.  It can be built in a few minutes, and combined with other circuits to make some pretty neat effects.   __ Designed by Aaron Cake

Simple Circuit DIY laser light show -  Taping a mirror to your sub-woofer and pointing a laser at it is fairly ingenious.  At least I never considered it, and I am nuts about lasers

Simple Circuit Flasher Operates Off AC Mains -  06/23/11 EDN-Design Ideas A few components create an illuminated switch.  Looking for a mains switch in the dark is easier if the switch contains a built-in neon or filament miniature lamp.  Adding a small indicator to any mains switch is heLPFul.  It is even better if the indicator flashes.  This circuit makes a simple flasher using only four discrete components  (Figure 1) .   __ Circuit Design by Noureddine Benabadji, University of Sciences and Technology, Oran, Algeria

Simple Circuit Flashing Light 1 -  This project uses a 3909 IC and a few other parts; power is 1.5 volts DC.   __ Designed by ML Rollins

Simple Circuit Flashing Light 2 -  This project uses parts from Digi-Key __ Designed by ML Rollins

Simple Circuit Flashing Light 3B -  The simplest flashing light circuit in the world! This is the simplest flashing circuit, suitable for tops of tall buildings, smokestacks and water towers __ Designed by ML Rollins

Simple Circuit LED flasher -  This circuit has a lot going for it.  For one thing, it only consists of two transistors, two capacitors and four resistors.  That also means it consumes very little power.  You can control the flash rate by changing the size of the 100k resistors    (100k makes for a pretty slow rate) .  You can also control the duty cycle by using resistors of different values on the two sides __ Designed by Colin Pringle

Simple Circuit light flashing This circuit use 2 transistor and some components.  

Simple Circuit Night-Light Uses a Photoresistor to Detect Dusk -  12/15/11Design Ideas: You can adjust this battery-powered circuit for different levels. __ Circuit Design by Chau Tran, Analog Devices, Malden, MA

Simple Circuit Transistor Organ -  This simple circuit can provide hours of enjoyment as you learn tunes, play duets or just make some really weird sounds by pushing all the buttons at once.  You have probably seen this circuit before, it is fairly common.  I have seen it in several __ Designed by Aaron Cake

Simple Circuitry for Cellular Telephone/Camera Flash Illumination -  Linear Technology AN95 __ Designed by Jim WilliamsMar 1st, 2004

Simple Light & Sound Indicator for Mains Power Supply -  While repairing or installing electrical machines in a building, the AC mains power supply is switched off from the mains electrical switchboard installed outside the building.  There is a chance that...__ Electronics Projects for You

Simplery for cellular-telephone/camera-flash illumination -  05/27/04  EDN-Design Ideas Successfully implementing flash lamps involves understanding numerous practical considerations.  Next-generation cellular telephones will include high-quality photographic capabilities.  To support their improved image sensors and optics, they will need high-quality "flash" illumination, which requires special design attention.  This lighting is crucial for yielding good photographic performance and requires careful consideration.   __ Circuit Design by Jim Williams, EDN's most revered contributor, passed away in June 2011 after a stroke.  He was 63.

Simplest LED Flasher -  This may be the simplest LED flasher circuit you can build, with the notable exclusion of LED's with integrated flashing circuits.  This might be a good replacement for the LM3909 in some applications. 
 __ Designed by Dick Cappels

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

Simulate the Gyralite (dual flashing headlights) -  This circuit must be connected to a 5 volt DC source.  See my RR page for several 5 volt supplies.  Note the flashing LED is optional, but looks s-o-o-o-o good on the top of a locomotive. __ Designed by ML Rollins

Single Cell Flashes White LED -  12/11/03 EDN-Design Ideas Many portable appliances and other products that must operate from a single cell are restricted to working at very low voltages.  It is thus difficult to drive white LEDs that typically have a forward voltage of 3 to 5V.  The ability __ Circuit Design by Anthony Smith, Scitech, Biddenham, Bedfordshire, UK

Single LED flasher -  Flashing a LED should not require a complex circuit.  A reverse biased transistor does the job in a nice way.  Circuit "a" flashes the LED twice a second: changing the capacitor and/or the resistor will change the frequency, also the supply voltage

Solar Flasher -  This circuit is a single transistor flyback  (Joule Thief) circuit that features a third coil.  With it, flash duration and brightness is much enhanced, without resorting to large value capacitors.  The performance can be seen in the following Videos  (on Youtube) : http://www.  youtube.  com/watch?v=tgcYcPdBwNo __ Designed by QS

Solid State 120 VAC Lamp Chaser -  This circuit is basically the same as the 10 channel LED sequencer with the addition of solid state relays to control the AC lamps.  The relay shown in the diagram is a Radio Shack 3 amp unit    (part no.275-310) that requires 1.2 volts DC to activate.  No current spec was given but I assume it needs just a few __ Designed by Bill Bowden

Solid-State Flasher Has Short-Circuit Protection -  01/16/97 EDN-Design Ideas The circuit in Figure 1 switches an inductive or resistive grounded load using a bootstrapped, n-channel, power MOSFET.  The circuit features short-circuit, reverse-polarity, and transient-input-voltage-spike protection.  The input voltage, VDD, can vary from about 18 to 30V, and the circuit can handle as much as approximately 10A with proper heat sinking of the FET.  The circuit flashes at a rate of about 100 flashes/minute, with a duty cycle of about 47%.  You can use this circuit as a solid-state flasher for vehicles with 24V nominal-power systems. __ Circuit Design by Navdhish Gupta, TDF Corp, Naperville, I - L

Sound triggered flash -  If you wish to take a picture of a fleeting event which generates a sound, you can do it with this sound activated trigger.  It does not require any power supply: it feeds on the high voltage available on the flash trigger terminal.  Any economic ceramic microphone is suitable for the purpose

Special Effects from a Six Pack -  Four channel Sequencer to Analog Dimmers and idea how to couple relay to the circuit

Strobe from Flash -  After using a disposable camera, you can build a strobe light  (flashing light) with one simple modification.   (6/02/2006)  __ Designed by Jose Pino

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

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

Strobe Light 12 Volt Coil Powered -  This circuit will give provide a Good Strobe Effect for a variety of
Portable Uses.  Nominal current draw is "up to about" 1 amp at 12 volts.  Depending on value of capacitor on pin 2 of the 555 and the particular choke that is used.  The .01 cap on pin 2 of the 555 may be slightly changed in value to optomize the output drive to the 22 mfd capacitor.   __ Designed by G.L. Chemelec

Strobe Trigger -  These pictures are scenes frozen by a flash unit that is triggered by the action being recorded.  They were made by setting up a shot, opening the camera shutter using its "bulb" setting, and carrying out some action that opened or closed a circuit to trigger the flash.  The balloon pictures were taken by triggering the flash when the balloon began to shrink after being popped.  In most cases the balloon had a strip of foil attached to it with probes pressed against it on two sides, with a circuit interrupted when the foil pulled away from the probes __ Designed by John DuBois

Strobex Schematic -  Schematic only for a Variable Intensity Variable Speed Stroboscop, no circuit description given.   __ Designed by Samuel M. Goldwasser

Strobo Control -  Remote controller for professional lighting system stroboscope, controls the flashing speed.   __ Designed by Tomi Engdahl

Strobo Disco Light using Standard Tube Lamp (TL) -  Using a standard fluorescent tube lamp  (TL) , you can make your own disco light, similar to a stroboscope light.  You can even use a half-broken lamp, which one side of the heating filaments has broken.  This circuit use only one side heating filament inside the tube.  Look at the circuit’s schematic below.

Stroboscope -  The 220v supply is rectified and then used to charge the two 3µ* capacitors.  The 1µ capacitor also charges  (more slowly) through the 150k resistor and 1M variable resistor.  When the voltage across the 1µ capacitor is high enough to cause the diacs to conduct, the thyristor is triggered.  This produces a high voltage "pulse" at the secondary of the transformer.  This pulse causes the tube to conduct and a flash of light is produced.  __ Acknowledgements The stroboscope was taken from an excellent French electronics magazine  sadly, no longer published called "Elex"

Stroboscope triggers -  This circuit typically uses a voltage around 300 volts for the main high voltage supply and needs a low voltage supply of typically 6 to 15 volts.   __ Designed by Don Klipstein

Super Bright 3v Powered LED Flasher -  I 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. . . Circuit by David Johnson P.E.-April, 2009

Super Simple Circuit Flasher -  File contains several designs, please scroll to find this circuit.  Here is a simple flasher circuit that uses no resistors! However, it relies on leakage in the base of the PNP germanium transistor and only some will work; be prepared to try a few.  If you add a 100k resistor from the base to the collector of the PNP, the circuit will work with most germanium transistors and will work down to 1 VDC! The NPN should be a silicon type.  The 100 uF may be replaced with a 22uF in series with a 5k resistor and it would be a good idea to add 39 ohms in series with the base of the NPN  (but then the circuit starts to lose its charming simplicity) .   __ Contact: Charles Wenzel of Wenzel Associates, Inc.

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Light Flashers:  #'s - B        C - K        LO        P - S         T - Z


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