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Linear Constant Current LED Lamp Dimmer - This circuits drives 24 white light
LEDs with an adjustable constant current. (added 4/02) |
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Linear-brightness controller for LEDs has 64 tapsLinear-brightness controller for LEDs
has 64 taps - 15-Mar-07 Issue of EDN Digital potentiometer controls
the brightness of LEDs..... [Design Idea by Ahmad Ayar, Maxim Integrated Products,
Sunnyvale, CA; Edited by Brad Thompson and Charles H Small] |
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Line-powered driver lights up high-power LEDs - 8-Jun-06 Issue of EDN
LED array reduces power and maintenance expenses..... [Design Idea by Aaron Lager,
Masterwork Electronics, Rohnert Park, CA; Edited by Brad Thompson and Fran Granville] |
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LM27961-Dual-Display White LED Driver with 3/2x Switched Capacitor Boost -
National Semiconductor Application Note (app note added 2/06) |
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LM3485 LED Demo Board - National Semiconductor Application Note (app
note added 2/06) |
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LM3570: Low Noise White LED Driver System - National Semiconductor
Application Note (app note added 2/06) |
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LM3909 LED flasher - uses an LM3909 LED flasher…. [Tony van Roon's circuit] |
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LM3909 replacement information - This page features a replacement circuit
for the LM3909 LED Flasher / Oscillator. The replacement circuit uses discrete
components and is essentially the same as the internal circuit of the LM3909. [from
Rob Paisley's Model Train web site] |
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LM555 LED Blinker Circuits - The circuit uses independent timers to flash
two light emitting diodes. Any time that light emitting diode D1 is lit__light
emitting diode D2 will be switched off. Light emitting diode D3 is on if both D1 and
D2 are off.....Circuit for model railroad trains…. [from Rob Paisley's Model Train web
site] |
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Logic Probe uses Bicolor LED - 03/13/98 EDN Ideas.....A project posed the
challenge of replacing existing analog potentiometers (used to set brightness and
contrast levels]in video monitors with digitally controlled potentiometers. The
different brands and models of monitors presented widely varying voltages across the
potentiometers. The design….PDF has several circuits, scroll to this one..... [Design
Idea by Mark Shill, Burr-Brown Corp, Tucson, AZ] |
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Low Noise White LED Driver System - National Semiconductor Application Note
(app note added 07/08/09) |
Low Power 10 LED Sequential Flasher
A while back I posted a flasher circuit which flashed 10 LEDs sequentially. That
circuit was powered by four AA alkaline cells. The circuit below operates much
the same way but has been modified to run from a single 3v CR2032 lithium coin cell.
The average battery current drain is a low 400uA. Yet, by using some super
bright green surface mounted LEDs from King Bright, the effect is quite impressive
even if each LED is driven with only 2ma of current........ |
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Low Power Blink LED - ….(electronic schematic added 08/08) [Site is under
construction right now] |
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Low Power LED Flasher - based on LM3909…. [from Bill's Electronics Reference
Library] |
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Low Power LED Voltmeter - This is a low power voltmeter circuit that can be
used with alternative energy systems that run on 12 and 24 volt batteries. The
voltmeter is an expanded scale type that indicates small voltage steps over the 10 to
16 volt range for 12 volt batteries and over the 22 to 32 volt..... [G. Forrest Cook] |
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low power, long life LED flashlight circuit - Scouring the Internet for
information on LEDs, I accidentally stumbled upon a PDF detailing a flashlight made
from PVC. For the torch, he biases ultra-bright LEDs with ballast resistors as
described in my LED lighting guide. This is a simple solution, but a with a
slightly more complicated circuit we can extend battery life by over ten
times!.....(project added 6/07) |
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LT3465-1.2MHz White LED Step-Up Converters with Built-In Schottky in ThinSOT -
Linear Technology LT3465 Switching Regulator (app note added 6/06) |
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LX1995 LED Driver: Camera Flash Application AN-30 - Application Note 30 from
Microsem.....[App Note] |
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