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Dancing LEDs redcircuits - A LED sequencer, following the rhythm of music or
speech 9 Volt Battery-operated portable unit (added 9/04) |
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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) |
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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) |
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Data Multiplexer Adds Cursor to LED Display Driver - 03/30/95 EDN-Design Ideas:
(design idea added 6/06) |
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DC/DC Converter Drives LumiLEDs White LEDs from a Variety of Power Sources -
DN340 Design Notes (Linear Technology) (app note added 6/06) |
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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) |
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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) |
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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) |
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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) |
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Digital LED Ammeter - Measures current up to 10A with selected 100mA, 10mA and 1mA
resolutions. (circuit added 8/06) |
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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) |
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Digital LED Voltmeter - Measures voltages up to 199.9V with 0.1V resolution.
(circuit added 8/06) |
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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) |
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Displays: LED Matrix - Information for the Common Anode LED Matrix Display for
SA04-11EWA, NFM-12882BEG-11, LEDM88RG (Updated 7/03/2006) |
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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) |
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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) |
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Drive High Intensity White LEDs Efficiently using the PIC16C781 - Microchip
Application Note Published 17-Jul-02 (app note added 2/06) |
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Driver Thermally Compensates Led - 09/02/99 EDN-Design Ideas:.....(design idea
added 2/06) |
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Driving LEDs in Battery Operated Applications: Controlling Brightness Power
Efficiently - Maxim Application Note #1804 (app note added 02/05) |
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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) |
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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) |
