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LED (Light Emitting Diodes) Circuits   Page 6
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Last Updated on:
Tuesday, April 01, 2014 04:33 AM

Circuits Designed by Dave Johnson, P.E. :
  • FLASHING LED ADVERTISING BADGE #1
    I have seen numerous Flashing light badges at trade shows and conventions. They are often handed out as gifts to promote some business. The devices often use inefficient circuits, which cause the battery power source to be quickly depleted. My circuit is simple but efficient enough to provide months of continuous LED Flashing. It also has a tiny push-button switch to turn on and off the light Flashing, extending battery power.

  • Fake Car Alarm Light
    Whenever the car’s ignition is turned off, this circuit activates a flashing LED, which can be positioned to appear as an active alarm system. (added 7/06)
  • High Intensity Line Powered LED Flasher
    There are times when you would like to generate an intensely bright flash of light using electrical power from the AC line.  The circuit below can drive a one to three watt power LED with about 350ma of peak current.  Since the circuit drives the LED with a constant current, any LED color can be used.  I have also shown how you could use an array of 7 LEDs, wired in parallel.  This array may not produce as much light as the single power LED but the array would be cheaper to build. ....
  • High Power LED Flasher    
    Power LEDs are becoming more popular these days.  The DC input power to these devices ranges from 1 watt to 5 watts.  Normal LEDs only receive about 0.05 watts.  At this higher power, these devices can emit a lot of light.  You can buy them in just about any color in the rainbow but white seems to be the most popular.  One application for these devices is a flashing light.  If the flash duration and flash rate is kept low, the average current can be low enough that even a small battery can last quite a while.....

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

Fader switch uses inexpensive controller -  12-Nov-09 Issue of EDN  Control the brightness of an LED or incandescent lamp..... [Design Idea by William Grill, Lenexa, KS]
Fading LEDs -  2-strips of LEDs fading in a complementary manner 9 Volt Battery-operated portable unit.....
Fading Red Eyes -  can be used to slowly illuminate and fade a pair of red LEDs (added 4/02)
Fake Car Alarm Light -  Whenever the car’s ignition is turned off, this circuit activates a flashing LED, which can be positioned to appear as an active alarm system..... [Designed by David A. Johnson]
Fancy LEDS -  The idea of this project came from my youngest son. He was dreaming of a small tool able to write symbols or pictures on a screen. As a graphic LCD (even bought at Crownhill :) ) was too expensive (or too easy??), the solution adopted was to pilot a matrix of Leds.  This way,.....(project added 07/07/07)
Fantastic Atom Expander (Aaron Cake) -  Here is the schematic, PC board pattern, and parts placement for a "Fantastic Atom Expander".  This circuit produces an "exploding atom" effect using 98 LEDs.
Fine Control SuperBright LED Pulser -  Four timing controls, 12V supply.  Suitable for Halloween or Christmas props. .....
Five- to 10-LED flashlight circuit runs at 3V -  15-Dec-08 Issue of EDN  With this simple circuit and easy-to-find components, you can convert bulb flashlights into energy-efficient, bright LED flashlights..... [Design Idea by GY Xu, XuMicro, Houston, TX]
Flashing Heart -  This circuit was made for my wife's birthday. It is capable of flashing five strings of LED's with different frequencies. It also has a connector for an 8 Ohm loudspeaker and two connectors for the small PCB's that are contained in musical greeting cards. In this way the circuit will play alternatingly two room filling tunes at regular time intervals. After a w.....(electronic design added 6/07)
Flashing High Intensity LED 3rd Brake Light -  This circuit to make a flashing3rd brake light assembly was designed to be easy to locate all the needed components and reasonably in expensive to build. (added 4/02)
Flashing Indicators -  Need to flash "turn indicators" using a 555 and a single 20 amp relay. Here is our suggestion. The timing resistor needs to be selected for the appropriate flash-rate.
Flashing LED -  This simple project makes a good low-cost first project to check your soldering skills and learn to identify common components. The LED flashes at about 3Hz (3 flashes per second).… [Designed by John Hewes]
Flashing LED Advertising Badge #1 -  I have seen numerous Flashing light badges at trade shows and conventions. They are often handed out as gifts to promote some business. The devices often use inefficient circuits, which cause the battery power source to be quickly depleted. My circuit is simple but efficient enough to provide months of continuous LED Flashing. It also has a tiny push-button switch to turn on and off the light Flashing, extending battery power. …. [Hobby Corner Circuit by Dave Johnson]
Flashing LED Advertising Badge #2 -  This circuit is similar to schematic Flashing LED Advertising Badge #1.  It uses a CD4013 dual D Flip/Flop IC.  The 74HCT74 IC in Flashing LED Advertising Badge #1 does not always work.  As in Flashing LED Advertising Badge #1, a single lithium battery will provide months of continuous LED flashing.  It also has a tiny push-button switch to turn on and off the light flashing..... [Designed by David A. Johnson]
Flashing LED Power Indicator Draws Low Current -  This circuit Flashes a power indicator LED to keep the average current low..... [Designed by David A. Johnson]
Flashing LED with PIC12F629 -  This is the first example that you should to know how to set output pin. In this example, GPO is set as an output. LED1 will be turn-on when GP0 is set high and LED1 wiil be turn-off when GP0 is set low.  This example use 4MHz internal clock. ….(electronic schematic added 11/08)
Flashing LED-based Solar Engine -  Voltage-Controlled Solar Engine:This design uses a flashing LED to determine the solar engine's voltage trip level.  (added 11/05)
Flashing Railroad Lights -  This circuit flashes two red LEDs for a model railway crossing.
Flashy Christmas Lights -  ....
Flicker Lamp -  Having bought a cute little ‘paraffin lamp’ from a cut price shop, I decided to make it a little more interesting. Its battery powered of course but its continuous shine and simple on / off ‘wick control’ did not make for anything like a close simulation of the real thing. So, I replaced the on / off control with a variable potentiometer and I added flicker!.....(added 04/04/04)
Flickering Fire Effect -  This simple circuit uses four low-Wattage colored bulbs and four fluorescent lamp starters to make nice flickering flame effect. (added 4/02)
Flickering Fire Light -  This may well be the world's only discreet logic circuit to generate truly random output. It makes an excellent candle flicker light for your Halloween pumpkin, and looks much more authentic than a shimmer light wherever a good a simulated flame effect is required. I do not guarantee the accuracy or safety of any information herein..... [Circuit by Stepan Novotill]
Flickering Lights -  Halloween flickering lights  (electronic circuits added 11/06)
Flying inductor LED series voltage boost circuit -  A circuit that goes in series with a white LED and a 1.5 volt cell to make > 3 Volts to drive a white LED.....(schematic / circuit added 6/07)
Four DIPs provide as many as 80 sequential-LED outputs -  21-Aug-08 Issue of EDN  A simple circuit uses HCMOS parts and adds one 74HC540 to multiplex the outputs of two 4017 counters for as many as 80 outputs..... [Design Idea by Greg Carkner, Cobourg, ON, Canada]
Garage Light Indicator LED -  This is the simplest possible way to power an LED off 115VAC.  I epoxied a high-brightness yellow LED into the switch plate to my garage light. The light switch is inside my house, but the garage light cannot be seen when the door is closed.  This has caused me to leave the garage light on overnight many times until I created this solution. I have outdoor lights.....[Designed by Andrew R. Morris  (added 09/05)]
Get More Than Three Colors from a Dot Matrix LED  -  06/05/98 EDN-Design Ideas.....To generate high voltages with proper insulation between  "hot node" and  rest of  circuitry, a car ignition coil can function in place of a high-voltage transformer. se coils have voltage ratings of approximately 20 kV.… [Design Idea by W Kurdthongmee, Nakorn Si Thammarat, Thailand]
Grantronics Projects Christmas Tree -  flashes LEDs mounted to Christmas tree shape PCB, kit from kitsrus.com (added 4/02)
Halloween Flashing-Eyes Badge -  Two-LEDs act as eyes following the rhythm of music or speech.  3V Battery-operated device suitable for pins or badges.  (added 4/08)
Heart of LEDs -  One of the requests we received after publication of the Christmas Star was "can you do different shapes?" Well, with Mother’s Day coming up soon, we thought a heart would be appropriate. Now you can have something different to give to that special Mum or Grandmother. or you may be able to redeem yourself if you forgot St Valentines Day! Either way, the Heart.....(added 4/05)
High Efficiency 12V White LED Driver -  11 white LEDs [G. Forrest Cook]
High Efficiency ThinSOT White LED Driver Features Internal Switch & Schottky Diode -  DN325  Design Notes (Linear Technology) (app note added 1/06)
High Efficiency White LED Driver Guarantees Matching LED Brightness -  DN267  Design Notes (Linear Technology) (app note added 1/06)
High Efficienty ThinSOT White LED Driver Feature Switche & Schottky Diode -  Linear Technology Magazine Design Ideas May 2004.....[App Note]
High Efficienty White LED Driver Guarantees Matching LED Brightness -  Linear Technology Design Note 267.....[App Note]
High Intensity Line Powered LED Flasher -  There are times when you would like to generate an intensely bright flash of light using electrical power from the AC line.  The circuit below can drive a one to three watt power LED with about 350ma of peak current.  Since the circuit drives the LED with a constant current, any LED color can be used.  I have also shown how you could use an array of 7 LEDs, wired in parallel. This array may not produce as much light as the single power LED but the array would be cheaper to build..... [Designed by David A. Johnson]
High Power IR LED Driver using the PIC16C781/782 -  Microchip Application Note Published 26-Sep-02  (app note added 2/06)
High Power LED Flasher -  Power LEDs are becoming more popular these days.  The DC input power to these devices ranges from 1 watt to 5 watts.  Normal LEDs only receive about 0.05 watts.  At this higher power, these devices can emit a lot of light.  You can buy them in just about any color in the rainbow but white seems to be the most popular.  One application for these devices is a flashing light.  If the flash duration and flash rate is kept low, the average current can be low enough that even a small battery can last quite a while..... [Designed by David A. Johnson]
High Power LED mood Lamp -  ….(electronic schematic added 08/08) [Site is under construction right now]
High Voltage Power Supply using a Highly Integrated DC/DC Converter TPS61040 Slva137.Htm, 0 Kb -  TI Application Note  (added 2/06)
High-power LED drivers require no external switches -  19-Jul-07 Issue of EDN  Suiting a variety of applications, these circuits transform a switching regulator into a current source for driving power LEDs..... [Design Idea by Alfredo H Saab and Steve Logan, Maxim Integrated Products, Sunnyvale, CA]
High-side current-sensing switched-mode regulator provides constant-current LED drive -  14-Apr-05 Issue of EDN  Drive LEDs with constant-current source..... [Design Idea by Bradley Albing, Philips Medical Systems Inc, Cleveland, OH; Edited by Brad Thompson]
How To Control Multiple Leds -  Multiplexing the I/O ports, you can control many leds using a few ports. (circuit added 5/06)
HV9931 Unity Power Factor LED Driver -  Supertex Semiconductors  (app note added 2/06)

 
LED:   #     A      B      C       D - E       F - H      I - K     L      M - O      P- R      S      T     U - V     W -Z


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