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

Last Updated: October 24, 2017 02:55 PM

Circuits Designed by Dave Johnson, P.E. :

 High Intensity Line Powered LED FlasherThere 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. . . Circuit by Dave Johnson P.E.-December, 2008

 High Power LED FlasherPower 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. . . Circuit by Dave Johnson P.E.-August, 2008

 HO Model Train Lighthouse FlasherHO train sets often have authentic looking scale model homes and buildings.  The hobby circuit below can be mounted inside a model lighthouse.  The electronic circuit drives a single LED lamp in such a way that it produces light which simulates the rotation . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

 HO Train Lighthouse Flasher RevisitedHO train sets often have authentic looking scale model homes and buildings.    A while back someone asked me to design a flashing LED light, which he could mount inside a model lighthouse and have it operate so it would appear to rotate and flash.    I designed a working circuit but I was never pleased with the results.    I’m still not 100% pleased but the revised circuit below seems to operate a bit better than the older circuit.  … [ . . . Hobby Circuit designed by Dave Johnson P.  E.  , May 2012] . . . Hobby Circuit designed by Dave Johnson P.E.-December, 2012

 Hot 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 . . . Hobby Circuit designed by David A. Johnson P.E.-May, 2005

 Improved Solar LED Spot LightNearly all the Chinese made solar powered LED lights I see being sold at Lowe's and Home Depot home improvement centers are poorly designed.  Their solar panels and battery packs are all undersized.  The light from their Chinese made LEDs fade rapidly and the devices never make it through a complete night before the light dies. . . Circuit by David Johnson P.E.-February, 2013

 Increased power for LED FlasherPower 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 . . . Hobby Circuit designed by Dave Johnson P.E.-August, 2008

 Indicates 120 VAC or 240 VA - CTwo LEDs indicate if a power line has 120vac or 240vac voltage on it . . . Hobby Circuit designed by David A. Johnson P.E.-January, 2007

 Indicates Battery Charge CurrentThis circuit turns on a LED whenever it detects at least 25ma of battery charge current . . . Hobby Circuit designed by David Johnson P.E.-July, 2006

 Inductive Pulse Receiver (175Khz)This circuit is discussed in more detail in the Experimenters Journal.  The receiver’s six inch diameter coil detects the ring signal from the above transmitter and use a single NPN transistor to provided enough amplification for the signal to be easily viewed on an oscilloscope . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000


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

Hacks And Mods: Incredibly Illuminated Persistence Of Vision Led Clock -  Persistence of Vision flashes LEDs during sure moments as it spins, to illustrate formulating a clock above.  The PCB blades have been spun around regulating a pc cooling air blower to create this POV clock.  The existence outcome is interjection to bright LEDs that have been synchronized with a Hall Effect sensor.  The house gets

Hacks And Mods: Led Light Box -  For beginners, it is their first project that gives them a boost.  And in order to get that, it is always necessary to make sure that the project that you select is really useful.  One such project is the RGB light fader.  This is quite simple and can be done easily by a beginner.  Read

Halloween Flashing-Eyes Badge -  Two LED-eyes follow the rhythm of music or speech; 3V Battery-operated device suitable for pins or badges __ Contact: Flavio Dellepiane, fladello @ tin.it

Halloween Pumpkin with Colorful LED Candles -  Extensive tutorial on putting blinking LEDs and different colored LEDs into jack-o-lanterns.  Includes schematics, solderless breadboard photos, and three movies  (the blue pulsing LED is my favorite) .  Great way of getting started in electronics! Although this was written for Halloween, the techniques are applicable for Christmas votive candles as well.   __ Contact: David Cook

H-bridge paves New ways for LED lighting -  07/11/13  EDN-Design Ideas Drive a LED array directly from the AC mains in full-wave current-limited mode to realize a flicker-free, energy-efficient solid-state lamp.  The H-bridge is a classic circuit used for driving DC motors in a user-defined manner, such as in forward/reverse direction or PWM-assisted controlled RPM with the help of four discrete/integrated switches or electromechanical relays.  It is widely employed in robotics and power electronics.  This Design Idea is a novel implementation of this technique for driving white-LED arrays directly from the AC mains in full-wave current-limited mode to realize an excellent flicker-free, energy-efficient solid-state lamp.   __ Circuit Design by Subodh Johri

Heart of LEDs -  Here is a fun project that you can give to that "someone special".  How about Mother's Day or did you forget St Valentine's Day?.   __ Designed by © Grantronics Pty Ltd

High Current Pulsed LED -  Just to Play withBut it Might have some Practical Applications __ Designed by G.L. Chemelec

High Efficiency 12V White LED Driver -  DC powered LED lighting circuits can vary from trivial single LEDs with series resistors and LEDs with simple analog current regulators to more complicated switching power supply circuits such as this project. There is a tradeoff between simplicity and circuit capabilities. This more complex circuit adds features such as regulated light level across a wide range of input voltages and automatic circuit shutoff on low input voltage. __ Designed by G. Forrest Cook

High Efficiency ThinSOT White LED Driver Features Internal Switch & Schottky Diode -  DN325 Design Notes__ Linear Technology/Analog Devices

High Efficiency White LED Driver Guarantees Matching LED Brightness -  DN267 Design Notes__ Linear Technology/Analog Devices

High Efficienty ThinSOT White LED Driver Feature Switche & Schottky Diode -  Magazine Design Idea  s May 2004__ Linear Technology/Analog Devices

High Efficienty White LED Driver Guarantees Matching LED Brightness -  Design Notes 267__ Linear Technology/Analog Devices

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. . . Circuit by Dave Johnson P.E.-December, 2008

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. . . Circuit by Dave Johnson P.E.-August, 2008

High power LED flashlight -  Using a Cree LED, homemade lens, rechargeable batteries, two regulated power levels, and electronic switching. __ Designed by Manfred Mornhinweg

High Power LED Mood Lamp -  In this page we will introduce a great project designed by Toon Beerten.  His project named "DIY Led Mood Lamp" can become a very interesting add-on for your room that's absolutely sure it will impress everyone.  As you can see on the photos, we talk about a color fading lamp, that looks amazing! __ Designed by Toon Beerten

High Power LED Stroboscope -  Stroboscope is a convenient and accurate enough instrument to measure speeds of rotating objects in homes or industries.  One can use it to find the speed of fans, motors or any other rotating object.  It is a flashing light that provides sharp light pulses at a variable rate.  An object rotating with frequency matching the pulsed light is observed as stationary__ Electronics Projects for You

High Voltage Power Supply using a Highly Integrated DC/DC Converter TPS61040 Slva137.Htm, 0 Kb -  TI App Note 

High-power LED drivers require no external switches -  07/19/07 EDN-Design Ideas Suiting a variety of applications, these circuits transform a switching regulator into a current source for driving power LEDs __ Circuit Design by Alfredo H Saab and Steve Logan, Maxim Integrated Products, Sunnyvale, CA

High-side current-sensing switched-mode regulator provides constant-current LED drive -  04/14/05 EDN-Design Ideas Drive LEDs with constant-current source __ Circuit Design by Bradley Albing, Philips Medical Systems Inc, Cleveland, OH

High-side current-sensing switched-mode regulator provides constant-current LED drive - 04/14/05 EDN-Design Ideas - DMany suitable circuits exist for driving LEDs in constant-current mode and from low-voltage sources. For example, references 1, 2, and 3 show circuits that use switched-mode-regulator ICs and low-voltage sources to supply LED current. __ Circuit Design by Bradley Albing

HO Model Train Lighthouse Flasher -  HO train sets often have authentic looking scale model homes and buildings.  The hobby circuit below can be mounted inside a model lighthouse.  The electronic circuit drives a single LED lamp in such a way that it produces light which simulates the rotation . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

HO Train Lighthouse Flasher Revisited -  HO train sets often have authentic looking scale model homes and buildings.    A while back someone asked me to design a flashing LED light, which he could mount inside a model lighthouse and have it operate so it would appear to rotate and flash.    I designed a working circuit but I was never pleased with the results.    I’m still not 100% pleased but the revised circuit below seems to operate a bit better than the older circuit.  … [ . . . Hobby Circuit designed by Dave Johnson P.  E.  , May 2012] . . . Hobby Circuit designed by Dave Johnson P.E.-December, 2012

Hot AC Power Line Indicator -  The 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 . . . Hobby Circuit designed by David A. Johnson P.E.-May, 2005

How to Control LED Brightness with a PWM using a 74AC14 -  We now have a simple circuit for generating variable duty-cycle pulse-width modulation.  The next two pages are devoted to practical applications of connecting the PWM to an electronic component.   For testing purposes, it is best to start with a safe, small, and simple load.  We'll start by adjusting the brightness of a single LED with a pulse-width modulated wave. __ Contact: David Cook

How to Control Multiple LEDs -  Multiplexing the I/O ports, you can control many LEDs using a few ports.   __ Designed by Jose Pino

IC Controlled Emergency Light with Charger -  White LEDs are replacing the conventional incandescent and fluorescent bulbs due to their high power efficiency and low operating voltage.  These can be utilised optimally for emergency lamp and vehicle turning...__ Electronics Projects for You

ICL7107-DigitAL LED AM METER -  Ammeter is a great addition to any Laboratory Power Supply as it will measure the current consumption and help you determine if there are any problems with the circuit that you are building or testing.  This amper meter is capable of measuring the current consumption up to 10A with selected 100mA, 10mA and 1mA accuracy.  

ICL7107-DigitAL LED VOLTMETER -  This digital voltmeter is ideal to use for measuring the output voltage of your DC power supply.  It includes a 3.5-digit LED display with a negative voltage indicator.  It measures DC voltages from 0 to 199.9V with a resolution of 0.1V.  

Improved Optocouplers Reduce Current Draw, Resist LED Aging -  14-Dec-07 EDN-Design Ideas With improved optocoupler circuits, you can enhance the accuracy of zero-voltage sensing __ Circuit Design by Peter Demchenko, Vilnius, Lithuania

Improved Solar LED Spot Light -  Nearly all the Chinese made solar powered LED lights I see being sold at Lowe's and Home Depot home improvement centers are poorly designed.  Their solar panels and battery packs are all undersized.  The light from their Chinese made LEDs fade rapidly and the devices never make it through a complete night before the light dies. . . Circuit by David Johnson P.E.-February, 2013

Increase Efficiency In Embedded Digital-I/O Lines -  04/21/11  EDN-Design Ideas Multiplex IO lines and drive LEDS without ghosting.  Digital-I/O-multiplexing techniques, such as “Charlieplexing” or “Gugaplexing,” let an eight-digit, seven-segment LED display connect to nine I/O pins of a microcontroller  (references 1 and 2) .  These methods use lower-duty-cycle timing, which requires a driver between the microcontroller’s I/O lines and the display to achieve good visibility.  The circuit in Figure 1 uses an 8+N/2 I/O bus for interfacing an N-digit display and as many as eight buttons on the same bus.  This method needs no driver.  You can apply it to any programmable device with LED-driving capabilities, such as small PIC or Atmel microcontrollers.
 __ Circuit Design by Vasile Surducan and Emanoil Surducan, National Institute for R&D of Isotopic and Molecular Technologies, Cluj-Napoca, Romania

Increased power for 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 . . . Hobby Circuit designed by Dave Johnson P.E.-August, 2008

Indicates 120 VAC or 240 VA - C -  Two LEDs indicate if a power line has 120vac or 240vac voltage on it . . . Hobby Circuit designed by David A. Johnson P.E.-January, 2007

Indicates Battery Charge Current -  This circuit turns on a LED whenever it detects at least 25ma of battery charge current . . . Hobby Circuit designed by David Johnson P.E.-July, 2006

Inductive Based Switch Regs Provide High Efficiency White LED Drives (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, 6-May-13

Inductive Pulse Receiver (175Khz) -  This circuit is discussed in more detail in the Experimenters Journal.  The receiver’s six inch diameter coil detects the ring signal from the above transmitter and use a single NPN transistor to provided enough amplification for the signal to be easily viewed on an oscilloscope . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

Inductive-Based Switch Regs Provide High-Efficiency White-LED Drvs -  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, 29-Apr-02

Inexpensive LED Drives Flash & Beep -  06/05/97 EDN-Design Ideas Sometimes, you need an alarm that is both audible and visible in an application that's stingy with space, power, and budget.  The circuit in Figure 1a is compact, efficient, and inexpensive.  The F336HD flashing LED  (part no.276-036 at Radio Shack) is a useful device.  It operates directly from 5V and produces a consistent pulse of light at approximately 1 Hz without a time-constant capacitor.    __ Circuit Design by Dennis Eichenberg, Parma Heights, OH

IR Remote Control Tester -  This is a fairly easy circuit that can be used to test TV and VCR remote controls.  The infrared detector module  (GP1U52X)  (Radio Shack 276-137) produces a 5 volt TTL pulse train corresponding to the digital code of the particular remote control key pressed.  In the lower circuit, the module output is normally low with no signal received and becomes a positive going pulse train when a signal is present __ Designed by Bill Bowden

IR Remote Control Tester -  Gadget Freak Case 147:Couch potatoes should be particularly interested in Bill Bowden's remote control IR receiver, which allows users to control the power of virtually any electrical appliance  (including those not equipped for remote) using their standard remote control.  It's based on an IR receiver circuit,  __ Designed by Bill Bowden

IR Remote LED Indicator Light -  There are times when you would like to transmit a signal from one LED indicator light to second LED at another location.  The circuit below works well for this application.  It takes advantage of the fact that the internal infrared LED inside an opto-isolator. . . Circuit by Dave Johnson P.E.-December, 2008

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

 


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