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


Last Updated: December 29, 2017 03:15 AM

Circuits Designed by Dave Johnson, P.E. :

1.5v LED Flasher Version A Many published circuits that flash LEDs need 3 volts or more.  This circuit uses only a single inexpensive C-MOS IC and flashes the LED for a full year on a single 1.5 volt AA alkaline battery cell.  The circuit uses a charge pump technique to provide. . . Circuit by Dave Johnson P.E.-June, 2000

1.5V Touch Activated Switch A single 1.5v silver oxide button cell powers this complete touch activated switch circuit for 5 years.  It features both a normally open and a normally closed set of solid-state switch thermals.  It also has an adjustable sensitivity, which can be set for a touch capacitance change as small as 1 picofarad.. . . Circuit by David A. Johnson P.E.-January, 2002

10 LED Sequential Flasher using Low Power A 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 Johnson P.E.-April, 2011

12v Touch Switch Exciter Circuit This circuit is designed to generate a 20KHz pseudo sine wave signal that can power about 50 remote touch activated switch circuits.    It can support a cable length of about 2500 feet.    A typical remote switch circuit is also shown as well as a receiver circuit for those switches.. . . Circuit by David Johnson P.E.-February, 2002


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

1 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

1.5 Volt 1970's Style Caboose Marker Flashing Red LED Light -  A circuit that drives a red LED from a 1.5 volt battery and simulates an incandescent light.  Duty cycle can be changed by selecting resistor values __ Designed by Dick Cappels

1.5V LED Flasher -  schematic only, no circuit description at this time __ Designed by Andrew R. Morris

1.5V LED Flasher Oscillator -  The 8-lead plastic mini-DIP LM3909 IC was developed by National Semiconductor in the mid 'seventies of the past century.  It was a monolithic oscillator specifically designed to flash Light Emitting Diodes.  By using the timing capacitor for voltage boost, it delivered pulses of 2 or more volts to the LED while operating on a supply of 1.5V or less.  The circuit was inherently self-starting, and required addition of only a battery and capacitor to function as an LED flasher __ Contact: Flavio Dellepiane, fladello @ tin.it

1.5v LED Flasher Version A -  Many published circuits that flash LEDs need 3 volts or more.  This circuit uses only a single inexpensive C-MOS IC and flashes the LED for a full year on a single 1.5 volt AA alkaline battery cell.  The circuit uses a charge pump technique to provide. . . Circuit by Dave Johnson P.E.-June, 2000

1.5V LED Flashers -  The LED flasher circuits below operate on a single 1.5 volt battery.  The circuit on the upper right uses the popular LM3909 LED flasher IC and requires only a timing capacitor and LED.  The top left circuit, designed by Andre De-Guerin illustrates using a 100uF capacitor to double the battery voltage to obtain 3 volts for the LED.  Two sections of a 74HC04 hex inverter are used as a squarewave oscillator that establishes the flash rate while a third section is used as a buffer that charges the capacitor in series with a 470 __ Designed by Bill Bowden

1.5V Touch Activated Switch -  A single 1.5v silver oxide button cell powers this complete touch activated switch circuit for 5 years.  It features both a normally open and a normally closed set of solid-state switch thermals.  It also has an adjustable sensitivity, which can be set for a touch capacitance change as small as 1 picofarad.. . . Circuit by David A. Johnson P.E.-January, 2002

10 Channel LED Sequencer -  The 4017 is a CMOS decade counter with 10 decoded outputs.  Inputs include a clock    (pin 14) , a reset    (pin 15) , and a clock inhibit    (pin 13)  __ Designed by Bill Bowden

10 Channel Light Controller -  A 10 channel light controller using PWM/ up to 1a per channel at 12v __ Contact: P. Townshend EduTek Ltd

10 LED Chaser -  I don't know why, but people like blinking lights.  You see LED chasers everywhere, in TV shows    (Knight Rider) , movies, and store windows.  This schematic is my version of a simple 10 LED chaser.  There is no 555 timer used because __ Designed by Aaron Cake

10 LED Sequencer -  Schematic only, text in Finnish

10 LED Sequential Flasher using Low Powr -  A 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 Johnson P.E.-April, 2011

10 Stage LED Sequencer -  The 4017 is a CMOS decade counter with 10 decoded outputs.  Inputs include a clock    (pin 14) , a reset    (pin 15) , and a clock inhibit    (pin 13)  __ Designed by Bill Bowden

10 Stage Light Sequencer -  schematic only -- flashes 10 low voltage bulbs, operates at10-25-Volt voltage, in PDF format, text in Finnish

10 to 100 LED Sequencer using a Matrix  -  The circuit above illustrates using a 10x10 matrix to sequence up to 100 LEDs with just three ICs and 20 transistors.  The two 4017 decade counters control the 10 rows and 10 columns so that one LED is selected depending on the output of the decade counters.  The LED circuit is drawn showing 25 LEDs and 10 transistors but can be expanded up to a 100 __ Designed by Bill Bowden

12 Stage Neon Sequencer NE 2/NE 51 -  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

12 to 100 LED Sequencer using a Matrix -  The circuit above illustrates using a 10x10 matrix to sequence up to 100 LEDs with just three ICs and 20 transistors.  The two 4017 decade counters control the 10 rows and 10 columns so that one LED is selected depending on the output of the decade counters.  The LED circuit is drawn showing 25 LEDs and 10 transistors but can be expanded up to a 100 __ Designed by Bill Bowden

12 Volt Strobe -  Strobes are useful devices for seeing fast moving components freeze or just as lighting effects.  Unfortunately for a really good result you need to use a Xenon flash tube which can produce intense brief discharges of light but it needs high trigger voltagesupwards of 4KV!  __ Designed by Phil Townshend 2012

12 Volt Strobe, Coil Driven -  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

120 VAC Lamp Chaser using Solid State Relays -  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

120 Volt AC Lamp Chaser using Solid State Relays -  This circuit is similar toLED clock using12 neon indicator lamps instead of LEDs.  It operates from2 high capacity ni-cad cells    (2.5 volts) which keep it going for a couple weeks.  High voltage    (70 volts) forneon lamps is obtained from a small __ Designed by Bill Bowden

120VAC Lamp Chaser using Solid State Relays -  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

12v Touch Switch Exciter Circuit -  This circuit is designed to generate a 20KHz pseudo sine wave signal that can power about 50 remote touch activated switch circuits.    It can support a cable length of about 2500 feet.    A typical remote switch circuit is also shown as well as a receiver circuit for those switches.. . . Circuit by David Johnson P.E.-February, 2002

14 Volt Strobe -  This circuit uses12V DC instead od mains AC.  This is very good idea if you don't want to mess with direct mains voltage connected circuit or you want to run  stroboscope from batteries __ Designed by Tomi Engdahl

16 LED Chaser -  By request, here is a 16 LED sequential chaser.  The LED's light one at a time, sequencing from bottom to top, then back down from top to bottom.  This circuit must be driven from some kind of clock generator.  Each pulse from the clock changes which LED is lit.  This circuit has been prototyped by Tony Hullibarger.  Thanks to Tony, errors were found and corrected! __ Designed by billd @ reprise.com

16 Stage Bidirectional LED Sequencer -  The bi-directional sequencer uses a 4 bit binary up/down counter    (CD4516) and two "1 of 8 line decoders"    (74HC138 or 74HCT138) to generate the popular "Night Rider" display.  A Schmitt Trigger oscillator provides the clock signal for the counter and the rate can be adjusted with the 500K pot.  Two additional Schmitt Trigger inverters are used as a SET/RESET latch to control the counting direction    (up or down) .  Be sure to use the 74HC14 and not the 74HCT14, the 74HCT14 may not work due to the low TTL input trigger level.  When the highest count is reached    (1111) the low output __ Designed by Bill Bowden

18 Stage LED Sequencer -  The question sometimes comes up of how to cascade 4017 decade counters for more than 10 sequencial stages.  The LED sequencer above shows a possible solution using a few extra parts.  When power is applied, the 15K resistor and 10uF cap at pin 15 will reset the counters to the zero count where pin 3 is at +12 and all other outputs are at zero.  The 2 diodes    (1n914) and 15 resistor form a AND gate so the clock pulse will be passed to the right side counter when the sequence starts.  When the right counter reaches the 10th count,  __ Designed by Bill Bowden

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


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