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

 

Last Updated: November 30, 2017 10:29 AM

Circuits Designed by Dave Johnson, P.E. :

3 Volt 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 Johnson P.E.-January, 1998

3v 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

3v 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 . . . Hobby Circuit designed by David Johnson P.E.-July, 2006

9v Powered 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:

2 Transistor Flasher -  The basic two-transistor flasher shown below has found its way into dozens of applications due to its simplicity and versatility.  Applications have included such diverse circuits as a micropower low battery indicator, a lightning detector, a off-line.   __ Contact: Charles Wenzel of Wenzel Associates, Inc.

2 Transistor LED Flasher -  This 1.5 volt led fasher runs more than a year on a single 'd" cell and alternately flashes 2 LEDs at about a 1 second rate.  The circuit employs a 74HC14 CMOS hex inverter that will operate at very low voltages    (less than 1 volt) .  One section is used as a squarewave oscillator    (pins 1 and 2) , while the others are wired to produce a short 10mS pulse on alternate edges of the square wave so the LEDs will alternate back and forth.  The output sections each use a capacitor charge pump to increase the voltage for the LEDs __ Designed by Bill Bowden

2 Transistor LED Flasher -  This circuit will flash a bright red LED as an attention getting device or fake care alarm. __ Designed by Bill Bowden

2 Transistor LED Flasher -  This is a classic 2 transistor astable multivibrator.  Many other NPN small signal or switching transistors can be used, including 2N4401, PN2222 or 2N2222 using the circuit on the left.  The circuit can also be inverted using PNP transistors.   __ Designed by Bill's Electronics Reference Library

2 Transistor LED Flasher -  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

2 Transistor LED Flasher 1 -  Circuit Only __ Designed by Tony van Roon  VA3AVR

2 Transistor LED Flasher 2 -  This circuit will flash a super-bright LED  (5000+ mcd) .  Good for fake car alarm or other attention getting device.  Component values are not critical, try anything else first from your junkbox.  Obviously, the 470 ohm resistor  (R3) determines the LED's brightness and limits the current flow to about 20mA.390 ohm can also be used as a save value.  If you decide to go with a green or yellow led, which draw more current, you may want to replace the 470 ohm with an appropriate value.  Flash rate is determined by R2 and C1 __ Designed by Tony van Roon  VA3AVR

200W Lamp Flasher -  200W Lamp Flasher kit is used to flash lamps, bulbs and halogen lamp to give your product that attracting look.   __ Designed by Rajkumar Sharma

220v AC Powered Blinking Led -  I needed a pulsating light for a certain signaling.  Voltage was 230V.  So I decided to make a simple circuit, consisted of a LED diode, two capacitors, two resistors, a diac and a diode.  Activity of the circuit is extraordinarily simple.  The capacitor charges by the diode and the resistor.  When the voltage on the

220V Blinking LED -  This is a simple blinking led circuit powered from 220V that can be used to mark special places or as voltage indicator.  The voltage from the mains charges the capacitor through R1 resistor and D1 diode.  

220V Solid State Flashing Lamp with 555 -  This 220V mains operated solid state flashing lamp circuit uses a 555 timer IC to control the ON and OFF times of a TRIAC which controls power to the load.  The power supply for the IC is obtained by half wave rectifier    (D1) , a stabilizer circuit    (D2 and R1) and filter capacitor C1.  The lamp stays ON for about 1 second and OFF __ Designed by Popescu Marian

230 Volts Flashing Lamps -  This circuit is intended as a reliable replacement to thermally-activated switches used for Christmas tree lamp-flashing. The device formed by Q1, Q2 and related resistors triggers the SCR.__ Flavio Dellepiane, fladello @ tin.it

230V Rotating & Blinking LED -  This design can be of some interest for those wanting striking light signs, as it can drive up to three 230V lamp strings in three operating modes.  The 15V dc supply is obtained from a nominal 230/24V center tapped ac transformer    (T1) and a full wave rectifier __ Contact: Flavio Dellepiane, fladello @ tin.it

25 LED Chaser (Sequencer) -  A Fairly Simple C-Mos Circuit.   __ Designed by G.L. Chemelec

25 Light Sequencer using Xmas Lamps -  This circuit above can drive 25 small Xmas lights.  The lights operate at about 200mA and 3 volts.  The supply voltage is set to 5 volts and the 4017 counter output will drop about a volt using the 2N3053 transistors.  The voltage on the emitters of the rows transistors will be about 0.7 volts less than the base so the lamp voltage will be about 3 volts.  You can __ Designed by Bill Bowden

250ksps 16-Bit Micropower ADC offers an Excellent Combination of Size Power & Speed -  DN294 Design Notes__ Linear Technology/Analog Devices

2-wire Lamp Flasher -  This circuit was designed to provide that continuous light lamps already wired into a circuit, become flashing. Simply insert the circuit between existing lamp and negative supply. __ Contact: Flavio Dellepiane, fladello @ tin.it

3 Channel Color Organ for a Car -  An Active Filter Design.   __ Designed by G.L. Chemelec

3 Channel-Color Organ -  An old ideabut I've had numerous requests for a good design for this __ Designed by G.L. Chemelec

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

3 Xenon flashings found in flash for disposable cameras -  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.   __ Contact: Collin Mitchell

36 LED Chaser -  example of multiplexed display to produce a chaserled's were mounted in a circle __ Contact: P. Townshend EduTek Ltd

3rd Brake Light -  This circuit is NOT a pulser or flasher! What's so special about this circuit? Well, the first third-brake light I installed I had to pull a wire from the Third Brake Light all the way underneath the carpet to the brake-pedal-switch and I thought it would be easier to pluck the signal of both brakelights via the trunk.  Bench-test your circuit first and apply power to the circuit,  __ Designed by Tony van Roon  VA3AVR

3rd Brake Light Pulser -  Several years ago these flashers were introduced in the automotive industry as part of the third brake light and contained strobe lights    (and strobing continuously for the duration of pressing the break pedal) but got abandoned almost immediately sometime later because of the 'strobe' effect it has on some people.  This circuit has become obsolet since much better circuits are available these days without the 'lag' in between brakes caused by R4 and C3.  One of the circuits is listed below __ Designed by Tony van Roon  VA3AVR

3V LED Chaser -  There are many 9V chaser circuits that seem to waste about 7V when driving LEDs that are only about 2V.  This project is unique, because it uses only two inexpensive alkaline battery cells totaling 3V for power.  Since most of the waste is eliminated, the cells last a long time.  Unlike the other circuits, this one flashes the LEDs for only about 30ms each, further extending the battery life.  For user convenience, it has a stepper speed control and a brightness control.  At slower speeds and with reduced brightness,  __ Contact: IQ Technologies

3v Powered Super Bright 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 . . . Hobby Circuit designed by David Johnson P.E.-April, 2009

3v 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 . . . Hobby Circuit designed by David Johnson P.E.-July, 2006

4 Channel CAR Color Organ -  Back in the 1970's these were popular for use in homes and the colored bulbs were typically place in a box with a sheet of "rippled/bubbled" Plastic in front to break up the light patterns.  Some units gave very impressive light patterns.   __ Designed by G.L. Chemelec

4 Channel HOME Color Organ -  FOUR Channels.  All Channels are Active Band Pass Filters.   __ Designed by G.L. Chemelec

4 Channel, 12 Volt Color Organ for a car -  Back in the 1970's these were popular for use in homes and the colored bulbs were typically place in a box with a sheet of "rippled/bubbled" Plastic in front to break up the light patterns.  Some units gave very impressive light patterns.   __ Designed by G.L. Chemelec

40 LED Bicycle Light 555 Timer 6 Volt -  The 555 circuit below is a flashing bicycle light powered with four C, D or AA cells    (6 volts) .  Two sets of 20 LEDs will alternately flash at approximately 4.7 cycles per second using RC values shown    (4.7K for R1, 150K for R2 and a 1uF capacitor) .  Time intervals for the two lamps are about 107 milliseconds    (T1, upper LEDs) and 104 milliseconds    (T2 lower LEDs)  __ Designed by Bill Bowden

555 Christmas Lights -  This 555 flasher project is an exception.  This is a take-off on the previous Firefly Lights Circuit posting.  I had a strip of four tiny PCBs remaining, so I built them up before __ Designed by Jim Keith

555 LED Flasher -  This is a small size led flasher built with the 555 timer IC that is powered from 2 x 1.5V batteries.  The circuit can be used as a flashing metronome, dark room timer, memo-reminder or other similar applications.   __ Designed by Popescu Marian

7 Channel Auto Reverse Sequential Disco Running Lights -  From 230 V AC a DC supply of + 5 V is obtained.  The power supply is given to the other blocks.  The pulse generator at a particular frequency generates the clock pulses.  The clock pulses are counted by a counter and gives output after every 10 pulses  __ Contact: IQ Technologies

741 Based Light Sensor -  The circuit as shown act as a light sensor.  Under normal conditions the resistance of the LDR is high, keeping pin 2 low.  When light falls onto the LDR the resistance drops to a couple hundred ohms and triggers pin 2 high which biases the base of Q1 via pin 6 and R4 and in turn activates the relay __ Designed by Tony van Roon  VA3AVR

81-LED Chaser Light using CD4 017 -  This is a simple 81-LED chaser light using two CD4017 decade counters.  NE555 timer is used for clock generation for CD4017.  We have used only two CD4017 ICs to construct the...__ Electronics Projects for You

9v Powered 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

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


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