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LED (Light Emitting Diodes) Circuits   Page 5
LED:   #     A      B      C       D - E       F - H      I - K     L      M - O      P- R      S      T     U - Z

Last Updated on: Friday, March 12, 2010 12:07 PM

 

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

Dancing LEDs redcircuits - A LED sequencer, following the rhythm of music or speech 9 Volt Battery-operated portable unit (added 9/04)

Dark-activated LED or Lamp Flasher - This circuit adopts the rather unusual Bowes/White emitter coupled multivibrator circuit. The oscillation frequency is about 1Hz and is set by C1 value…..(electronic design added 6/07)

Dark-Detecting LED Circuit - Here's a simple problem: "How do you make an LED turn on when it gets dark?" You might call it the "nightlight problem," but the same sort of question comes up in a lot of familiar situations-- emergency lights, street lights, silly computer keyboard backlights, and the list goes on. Solutions? Lots. The time-honored tradition is to use a circuit with a CdS photoresistor, sometimes called a photocell or LDR, for "light-dependent resistor.".….(design added 11/08)

Data Multiplexer Adds Cursor to LED Display Driver - 03/30/95 EDN-Design Ideas: (design idea added 6/06)

DC/DC Converter Drives LumiLEDs White LEDs from a Variety of Power Sources - DN340  Design Notes (Linear Technology) (app note added 6/06)

Decibel Meter - The circuit below responds to sound pressure levels from about 60 to 70 dB. The sound is picked up by an 8 ohm speaker, amplified by a transistor stage and one LM324 op-amp section. You can also use a dynamic microphone but I found the speaker was more sensitive. The remaining 3 sections of the LM324 quad op-amp are used as ....(electronic circuit added 10/05)

Descrete Multistage Light Sequencer - The drawing below illustrates a multistage light sequencer using descrete parts and no integrated circuits. The idea is not new and I hear a similar circuit was developed about 40 years ago using germanium transistors. The idea is to connect the lights so that as one turns off it causes the next to turn on, and so forth. This is accomplished with a large capacitor between each stage that charges when a stage turns off and supplies base current to the next transistor, thus turning it on. Any....(circuit added 05/09)

Dice - Press the push switch to 'throw' the dice: this makes the circuit rapidly cycle through the dice numbers so that an effectively random dice number is displayed by the LEDs when the push switch is released....Designed by John Hewes (circuit added 06/07/08)

Dice (nutchip) - A LED dice, bright, unbiased, and spectacular.  The display uses 7 LEDs to simulate the faces of a real dice…. (electronic design added 6/07)

Digital LED Ammeter - Measures current up to 10A with selected 100mA, 10mA and 1mA resolutions.  (circuit added 8/06)

Digital LED Clock & Timer - This is a combination digital clock timer and solar panel charge controller used to maintain a deep cycle battery from a solar panel. The timer output is used to control a 12 volt load for a 32 minute time interval each day. Start time is set using 9 dip switches and ends 32 minutes later. The 32 minute duration ....(electronic circuit added 10/05)

Digital LED Voltmeter - Measures voltages up to 199.9V with 0.1V resolution.  (circuit added 8/06)

Discrete Version Of The LM3909 Oscillator IC - This page features a replacement circuit for the LM3909 LED Flasher / Oscillator using discrete components. The circuit is functionally the same as the integrated LM3909 but has a minor variations in values of the components used....(electronic circuit added 7/03)

Displays: LED Matrix - Information for the Common Anode LED Matrix Display for SA04-11EWA, NFM-12882BEG-11, LEDM88RG (Updated 7/03/2006)

Dot/Bar Display Driver - The LM3915 is a monolithic integrated circuit that senses analog voltage levels and drives ten LEDs, LCDs or vacuum fluorescent displays, providing a logarithmic (added 07/07/07)

Drive a blue LED from a 3V battery - 02/15/07 EDN-Design Ideas: Two 1.5V cells and a few components can light a blue LED.....(design idea added 9/08)

Drive High Intensity White LEDs Efficiently using the PIC16C781 - Microchip Application Note Published 17-Jul-02  (app note added 2/06)

Driver Thermally Compensates Led - 09/02/99 EDN-Design Ideas:.....(design idea added 2/06) 

Driving LEDs in Battery Operated Applications: Controlling Brightness Power Efficiently - Maxim Application Note #1804 (app note added 02/05)

Driving RGB LED using Lp3936 Lighting Management System - National Semiconductor Application Note 1293 The LP3936 Lighting Management IC contains a versatile RGB Driver. It needs only a few register writes through the
serial interface to start and maintain complex blinking patterns thus reducing microcontroller loading. (app note added 2/06)

Driving RGB LEDs using Lp3933 Lighting Management System - National Semiconductor Application Note 1291 The LP3933 Back/Funlight Management IC contains two versatile RGB LED Drivers. It needs only a few register
writes through the serial interface to start and maintain complex blinking patterns thus reducing microcontroller loading. (app note added 2/06)

Dual Full Function White LED Step-Up Converter with Built-In Schottky Diodes - Linear Technology LT3466 (app note added 02/05)

Dual LED Flasher - Some useful circuits using the LM555 IC.  Scroll to find the Dual Led Flasher circuit (11/06)

Dual White LED Driver Features Integrated Switches & Schottky Diodes in 3mm × 3mm Dfn Package - DN1010  Design Notes (Linear Technology)  (app note added 1/06)

Dual-Display with LED Driver with 3/2x Switched Capacitor Boost - National Semiconductor Application Note LM2796 February 2004 (app note added 02/05)

Dynamo-Powered LED Headlight & Tail Light for your Bicycle - Three classes of LED light systems are presented: Basic, Medium Power and High Power, a tip

Economical Circuit Drives White LEDs - 11/23/00 EDN-Design Ideas:.....(design idea added 6/03)

Efficiently Powering Nine White LEDs with the MCP1650 - Microchip Application Note Published 3-Aug-04  (app note added 2/06)

Eight LEDs Random Flasher - This project flashes eight LEDs in an apparently random manner. It uses a 4026 combined counter and display driver IC which is designed for driving 7-segment LED displays. The sequence is not really random because seven of the LEDs would normally be the display segments, the eighth LED is driven by an output that is normally ....(circuit added 06/07/08)

Emergency Light - A simple circuit that activates a light when the power is out. A version with a lightbulb and another with white LED light included. (6/25/2006)

Expandable 16 Stage LED Sequencer - The circuit below uses a hex Schmitt Trigger inverter (74HC14) and two 8 bit Serial-In/Parallel-Out shift registers (74HCT164 or 74HC164) to sequence 16 LEDs. The circuit can be expanded to greater lengths by cascading additional shift registers and connecting the 8th output (pin 13) to the data input (pin 1) of the succeeding stage. A Schmitt trigger oscillator (74HC14 pin 1 and 2) produces the clock signal for the shift registers, the rate being approximately 1/RC. Two additional Schmitt Trigger stages are used to reset and load the registers when power is turned on. Timing is not critical,...(circuit added 7/02)

Extending Battery Life with the TPS61040 White Light LED Driver - TI Application Note  (added 2/06)


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