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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. :

Ultra Low Current 3v LED Flasher #7This 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

Ultra Low Power LED FlasherThe efficiency of some newer LEDs is amazing.  Some of the latest green LEDs can launch blinding light with just one milliamp of current.  I take advantage of one of these newer devices in the circuit below.  The flashing circuit uses a classic multivibrator . . . Hobby Circuit designed by David A. Johnson P.E.-December, 2008

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

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

Well Pump Flasher & Beeper -  Several years ago I installed a box on my water well pump head.  At the well head, the solar powered box flashed a very bright LED light and chirped a very load siren, whenever the pump motor was in operation.  After many years of service, the box finally became corroded from rain water and died.  So, I thought it was time to redesign the circuit and build up a replacement. . . . Circuit by David Johnson P.E.-August, 2017

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 Dave 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 A. Johnson P.E.-June, 2000


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

Ultra Low Current 3v LED Flasher #7 -  This 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

Ultra Low Power LED Flasher -  The efficiency of some newer LEDs is amazing.  Some of the latest green LEDs can launch blinding light with just one milliamp of current.  I take advantage of one of these newer devices in the circuit below.  The flashing circuit uses a classic multivibrator . . . Hobby Circuit designed by David A. Johnson P.E.-December, 2008

Universal Flasher -  LED flasher with the LM3909 IC and runs from1.5-Volt battery.   __ Designed by Tony van Roon  VA3AVR

Universal Flasher using a Latching Relay -  Latching 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 Flasher -  This 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-Flasher -  The 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

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

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

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

Well Pump Flasher & Beeper -  Several years ago I installed a box on my water well pump head.  At the well head, the solar powered box flashed a very bright LED light and chirped a very load siren, whenever the pump motor was in operation.  After many years of service, the box finally became corroded from rain water and died.  So, I thought it was time to redesign the circuit and build up a replacement. . . . Circuit by David Johnson P.E.-August, 2017

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 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 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 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 Dave 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 A. 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

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

 


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