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Light Emitting Diodes (LED) Circuits
LEDs:   #'s - B     C - G      H - L       M - P       Q - T     U - Z 
 

Last Updated: November 30, 2017 10:29 AM

Circuits Designed by Dave Johnson, P.E. :

 AC Line Powered LED FlasherSome of the latest LEDs are amazing.  They can produce a surprising amount of light with very little current.  In the light flasher application shown below I take advantage of a nice surface mounted LED from King Bright.  This flasher circuit draws only about 3ua of average current from the AC power line to flash this green LED.  This flasher might be used as a power indicator light . . . Hobby Circuit designed by David Johnson P.E.-December, 2008

 AC Line Powered LED Pilot LightThis simple circuit can be used to light a LED indicator lamp, powered from the 120vac line.  I have included component values for 240vac lines as well . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

 AC Line Powered LED StringsThis shows 4 different ways to string white LEDs that are powered by a 120vac or 240vac power line.    This hobby circuit was designed by Ken Schultz.. . . Circuit by David Johnson P.E.-December, 2004

 AC Power Loss AlarmI’ve been having a problem with my instant hot water system lately.  This system circulates electrically heated water throughout my house using a small pump.  The pump is wired into a ground fault interrupter   (GFI) module.  Every now and then, the GFI trips, leaving me without hot water. . . Circuit by David A. Johnson P.E.-March, 2009

 Active AC Power Line IndicatorThe circuit below is designed to detect when a power cable is active   (hot) .  When the flat sensor end of the device is held near an active AC line, the bright green LED on the top of the housing will glow.  It is powered by a 3v CR2032 lithium coin cell.  I. . . Circuit by Dave Johnson P.E.-May, 2005

 Advertising Badge #1 with Flashing LEDI 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. . . Circuit by David A. Johnson P.E.-March, 2002

 Advertising Badge #2 with Flashing LEDThis circuit uses a CD4013 dual D Flip/Flop IC.  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. . . Circuit by Dave Johnson P.E.-March, 2002

 AIR Transparency Monitor, Xenon Flash TransmitterThis is the matching transmitter for the above receiver.  The transmitter launches powerful 1000-watt light pulses that last about 20 microseconds. . . Circuit by David A. Johnson P.E.-June, 2000

 Auxiliary 12v Automotive Style LED Light Makes Table LampThis circuit provides about one watt of non-isolated DC power for an automotive type 12v LED array lamp in addition to a standard incandescent table lamp . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006


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

AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A) -  LED lighting designers are challenged with meeting their efficiency and reliability goals faster in advanced LED lighting designs.  LED lighting customers seeking the latest in innovative and affordable LED lighting solutions can benefit from TI's broad product portfolio of LED drivers, AC/DC, DC/DC, power management devices, wireless and wired interface control and embedded processors.  LED designers have the option of not only controlling the power stage, but regulating LED currents as well, eliminating the need for multiple components and reducing system cost.   __ Designed by Texas Instruments App Notes, 23-Apr-13

AN-2034 LM3445-120VAC, 8W Isolated Flyback LED Driver (Rev. C) -  This demonstration board highlights the performance of a LM3445 based Flyback LED driver solution that can be used to power a single LED string consisting of 4 to 8 series connected LEDs from an 90 VRMS to 135 VRMS, 60 Hz input power supply.  The key performance characteristics under typical operating conditions are summarized in this application report. __ Designed by Texas Instruments App Notes, 1-May-13

AN-2069 LM3445-230VAC, 6W-15W Isolated Flyback LED Driver (Rev. B) -  LED lighting designers are challenged with meeting their efficiency and reliability goals faster in advanced LED lighting designs.  LED lighting customers seeking the latest in innovative and affordable LED lighting solutions can benefit from TI's broad product portfolio of LED drivers, AC/DC, DC/DC, power management devices, wireless and wired interface control and embedded processors.   __ Designed by Texas Instruments App Notes, 23-Nov-10

AN-2082 LM3444-120VAC, 8W Isolated Flyback LED Driver (Rev. E) -  LED lighting designers are challenged with meeting their efficiency and reliability goals faster in advanced LED lighting designs.  LED lighting customers seeking the latest in innovative and affordable LED lighting solutions can benefit from TI's broad product portfolio of LED drivers, AC/DC, DC/DC, power management devices, wireless and wired interface control and embedded processors.  __ Designed by Texas Instruments App Notes, 1-May-13

AN-2090 LM3448-120VAC, 6W Isolated Flyback LED Driver (Rev. C) -  LED lighting designers are challenged with meeting their efficiency and reliability goals faster in advanced LED lighting designs.  LED lighting customers seeking the latest in innovative and affordable LED lighting solutions can benefit from TI's broad product portfolio of LED drivers, AC/DC, DC/DC, power management devices, wireless and wired interface control and embedded processors.  LED designers have the option of not only controlling the power stage, but regulating LED currents as well, eliminating the need for multiple components and reducing system cost.   __ Designed by Texas Instruments App Notes, 1-May-13

AN-2097 LM3444-230VAC, 8W Isolated Flyback LED Driver (Rev. F) -  LED lighting designers are challenged with meeting their efficiency and reliability goals faster in advanced LED lighting designs.  LED lighting customers seeking the latest in innovative and affordable LED lighting solutions can benefit from TI's broad product portfolio of LED drivers, AC/DC, DC/DC, power management devices, wireless and wired interface control and embedded processors.  LED designers have the option of not only controlling the power stage, but regulating LED currents as well, eliminating the need for multiple components and reducing system cost.   __ Designed by Texas Instruments App Notes, 1-May-13

AN-2102 LM3464 & LM5021 DHC 25W Reference Designs (Rev. A) -  LED lighting designers are challenged with meeting their efficiency and reliability goals faster in advanced LED lighting designs.  LED lighting customers seeking the latest in innovative and affordable LED lighting solutions can benefit from TI's broad product portfolio of LED drivers, AC/DC, DC/DC, power management devices, wireless and wired interface control and embedded processors.  LED designers have the option of not only controlling the power stage, but regulating LED currents as well, eliminating the need for multiple components and reducing system cost.   __ Designed by Texas Instruments App Notes, 1-May-13

AN-460 LM34/LM35 Precision Monolithic Temperature Sensors (Rev. C) -  LED lighting designers are challenged with meeting their efficiency and reliability goals faster in advanced LED lighting designs.  LED lighting customers seeking the latest in innovative and affordable LED lighting solutions can benefit from TI's broad product portfolio of LED drivers, AC/DC, DC/DC, power management devices, wireless and wired interface control and embedded processors.  LED designers have the option of not only controlling the power stage, but regulating LED currents as well, eliminating the need for multiple components and reducing system cost.   __ Designed by Texas Instruments App Notes, 1-May-13

Analog LED Bar VU Meter -  The circuit was designed to work with an audio power amplifier which operated off +18v-0v-18v power rails.  The actual voltage used is not too critical except that the feedback is referred to the LED chain which itself is anchored to a +12v rail, hence the separate stabilizer __ Designed by Richard Torrens

Analysis & Design of Hysteretic Constant Freq Buck Regr using the LM5007 (Rev. B) -  LED lighting designers are challenged with meeting their efficiency and reliability goals faster in advanced LED lighting designs.  LED lighting customers seeking the latest in innovative and affordable LED lighting solutions can benefit from TI's broad product portfolio of LED drivers, AC/DC, DC/DC, power management devices, wireless and wired interface control and embedded processors.  LED designers have the option of not only controlling the power stage, but regulating LED currents as well, eliminating the need for multiple components and reducing system cost.   __ Designed by Texas Instruments App Notes, 30-Apr-13

Analyze LED characteristics with PSpice -  01/18/01 EDN-Design Ideas Recent advances in LED technology have lead to LEDs' wIdeaspread use in outdoor-signal applications, such as in traffic and railroad signals.  A typical LED signal consists of an LED array and a power supply.  When a low-voltage power supply is eir desirable or mandatory, series/parallel combinations of LEDs become inevitable __ Circuit Design by Sam Mollet, GE Harris Harmon Railway Technology, Grain Valley, MO

Animated LED Signboard PIC16C84 -  Schematic only, no circuit description __ Designed by Lewin A.R.W. Edwards

Animated Weather LED Display -  21-Mar-14 -Design News:   This project displays the weather in the form of an animation on an LED matrix  (32x32 resolution or 1024 LEDs) .  The Raspberry Pi is periodically pulling weather conditions from the Internet and then sending a corresponding animated gif weather animation to the IOIO board and LED display.  IOIO is an __ Gadget Freak-Case #252

Anti-Flicker for LED Christmas Lights -  I like the idea of LED light strings that rarely need new bulbs but the flicker drives me crazy! Here's the solution for single strings of LEDs all in series __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Arrange LEDs as Seven-Segment Displays -  05/26/11  EDN-Design Ideas When you need to drive three seven-segment LED displays, you typically need 10 I/O lines—and that’s without a decimal point.  You might think that you cannot accomplish that task without a binary-to-seven-segment decoder or a serial-to-parallel shift register    (Reference 1) .  Many previous Design Idea     have shown how to maximize the number of LEDs you drive with a minimum number of I/O lines    (references 2 through 5) .  This Design Idea shows how you can build a circuit that drives 21 LEDs, thus forming three pseudo-seven-segment displays. __ Circuit Design by Charaf Laissoub, Valeo Engine and Electrical Systems, Créteil, France

ArroW & Line Running LED's -  Our ARROWERL10 has many applications; fill your party with running blinking ARROWERS.  Mount the ARROWER on your bicycle so you'll be more visible and have a safer ride when signaling.  Mount it on a sign as an direction indication.  Place ARROWER anywhere you’d like to draw attention and a smile.  The unique small design will allow you to mount it almost anywhere.   __ Contact: Kit from Elich Industrial Development, Corp

ArroW Lighting-TI DC/DC LED Driver Solution -  In this article, 2 lighting applications of TI TPS40211 will be presented.  TI TPS40211 is a DC/DC LED driver controller which accepts DC voltage up to 52V and is able to fit various kinds of LED lighting application including MR16
as well as streetlamp application.   __ Designed by James Ho, Arrow Asia Pac

Astable Multivibrator -  Scroll to find this circuit.  This is an astable multivibrator circuits to alternately flash two LEDs.  The R & C values determins.   __ Designed by Bill Bowden

Astable Multivibrator Lights LED From a Single Cell -  08/21/08 EDN-Design Ideas A classical multivibrator drives a step-up inductor to power an LED from a single cell __ Circuit Design by Luca Bruno, ITIS Hensemberger, Monza, Lissone, Italy

Astro LED Torch -  A red LED torch is essential for preserving your dark adapted vision at night allowing you to read star charts as well as setup and take down your accessories safely.  The red wavelength is specific to retaining your night sight so you can observe without distracting white light that destroys dark adaption for long periods.  If __ Designed by T.K. Hareendran

AT89C2051 Serial COMs to LED driver -  This document describes the HSETI PCB.  This PCB is a small simple application for the Atmel AT89C2051 microprocessora 20 pin 8051 variant, with FLASH    (reprogrammable) program memory.  The board has just two chips on it, the CPU and a driver/buffer.  __ Airborn Electronics, Australia

AT89c2051/4051 Driving Dot Led -  A basic circuit of the 89C2051 shown here can be made easily using point-to-point soldering with a universal PCB.  Use an ordinary 20-pin socket, do not use a circle-pin socket.  D1 is a small dot LED.  U2 can be either 7805 or 78L05.  U3 is optional for correcting any polarity DC adapter.  Without the 2051 chip __ Designed by Wichit Sirichote

Atmel AVR Tiny13V for driving a white LED -  LED headlamp projects: Tiny13V microcontroller as step up    (boost) or step down    (buck) voltage converter for driving a white or high power LED.     (pdf file) Desgin equations and source code included.   __ Designed by Steven Weber, KD1JV

Audio Light Modulator -  Audio light modulations add to  enjoyment of music during functions organised at home or outdoors.  Presented here is one such simple circuit in which light is modulated using a small fraction of  audio output from  speaker terminals of  audio amplifier.  The output from  speaker terminals of audio amplifier is connected to a transformer

Auto Speed LED Sequencer -  Our SEQUENCERS4 has many applications; simply power the board and light 4 LEDs start to "move, " left to right again and again in sequence! This automatic sequence of blinking lights    (LED) can be controlled directly from a front mounted multi-turns trimmer    (pot.) and will draw attention and fun! The unique small design will allow you to mount it almost anywhere.  Operate it with 6V, 9V battery, 12V car battery, four 1.5V batteries, or via one of our battery simulator kits __ Contact: Kit from Elich Industrial Development, Corp

Automatic Anchor light -  Federal and international regulations require boats to carry lights during sunset, sunrise and at conditions with restricted visibility.  The number and colors of light vary with the size of vessel.  A masthead anchor light is out of fashion as it is too high above the water level.  This makes it difficult to judge the position of the boat, especially in a pitch-dark anchorage.  This project is a compact yet inexpensive automatic anchor light integrated with an ambient light sensor that turns it on and off automatically__ Electronics Projects for You

Automatic Dual Output Display -  This circuit lights up ten bulbs sequentially, first in one direction and then in the opposite direction,thus presenting a nice visual effect.In this circuit, gates N1 and N2 form an oscillator....__ Electronics Projects for You

Automatic LED display dimmer using a LED as a light sensor -  Microcontroller based electronic circuit __ Designed by Bruno Gavand

Automatic Room Lights -  An ordinary automatic room power control circuit has only one light sensor.  So when a person entersroom it gets one pulse andlights come ‘on.  ’ Whenperson goes out it gets anor pulse andlights go ‘off.  ’ But what happens when two persons enterroom, one afteror? It gets two pulses andlights remain in ‘off’

Automatic Solar Garden Lights with LEDs -  Efficient automatic solar garder lights circuit with minimum components the best deal is that is completely auto and the Solar panel acts as a light detector.  Switches the Lamp off at Dawn, charges the battery during daytime and switches the LED lights ON at dusk providing 100 Lumens illumination during the night.  The solar __ Designed by Sebastian Kushero

Auxiliary 12v Automotive Style LED Light Makes Table Lamp -  This circuit provides about one watt of non-isolated DC power for an automotive type 12v LED array lamp in addition to a standard incandescent table lamp . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

AVR Color Clock using RGB LEDs -  This page describes a color clock that displays the time using two RGB LEDs, one for hours and one for minutes, showing time by using the standard color coding used for components    (with two additional colors as the standard color coding only has ten colors and twelve is needed)  __ Designed by Rickard Gunee

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LEDs:   #'s - B     C - G      H - L       M - P       Q - T     U - Z 


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