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The LED Flashing Sweetheart Kit - When was the last time you gave a gift you
made yourself? Elementary school? Get off the consumerist fast track and quit copping
out with inferior gifts like candy and flowers. The LED Flashing Sweetheart Kit
contains a circuit board, 28 LEDs..... |
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The LM3410 LED Driver - The LM3410 IC is a constant current LED driver
useful in either boost converter or SEPIC design applications. A SEPIC (Single Ended
Primary Inductance Converter) design allows the power supply’s output voltage to be
set above, below or equal to its input voltage….must register on this site....
[Published in Elecktor July/August 2010] |
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The Propeller a mechanically scanned LED clock - ..... |
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The Ultimate Universal Remote Control - 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, |
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Thermometer with Four-Digit LED Display - Until recently, the Philips
SAA1064 LED driver IC has been a sort of unofficial standard for driving seven-segment
LED displays. It can be used to implement four-digit displays that can be driven over
an I2C bus….must register on this site.... [Published in Elecktor July/August 2010] |
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Three Fake Alarms - Flashing LEDs can be used to create the impression that
an alarm has been fitted. Or they can be used in conjunction with a real alarm, to
warn-off a potential thief. These three small circuits will flash anything from a
single LED, up to 90 LEDs and beyond, with a variety of speeds and patterns..... [Ron
J.'s circuit] |
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Three Flashing LED Doorbells - These circuits combine a buzzer with one or
more LED displays. When the push switch is operated, the buzzer will sound and the
LEDs will flash. When the switch is released, the buzzer will stop, but the LEDs will
go on flashing for another 30 seconds or so.,,, [Ron J.'s circuit] |
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Three microcontroller ports drive 12 LEDs - 15-Dec-06 Issue of EDN
Engine tachometer uses few components and I/O lines..... [Design Idea by Nedjeljko
Lekic and Zoran Mijanovic, University of Montenegro, Department of Electrical
Engineering, Podgorica, Montenegro; Edited by Brad Thompson and Fran Granville] |
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Three-Colour Display using Bicolour LEDs - ..... |
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Tiny Efficient High Power LED Camera Flash Solutions for Cell Phone Applications -
Linear Technology Design Note 231.....[App Note] |
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Tiny Regulators Drive White LED Backlights - Linear Technology Design Note
231.....[App Note] |
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Torch Circuits-LED - A LED torch is one of the simplest projects you can
build and it's very interesting as it uses a super-bright white LED. In the history of
LED production, red LEDs were the first to be invented and their output was so dim you
could barely see if they were illuminated. You needed a darkened room to see them at
all.....(circuits added 08/08/08) |
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TPS6102x Boost Converter Down Conversion Mode - TI Application Note
(added 2/06) |
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TPS61040 Inverter Design Rev. A - TI Application Note (added 2/06)
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TPS61042 Dual Li-ION & Higher Input Voltages - TI Application Note
(added 2/06) |
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TPS61042 White Light LED Driver Boost Converter Rev. A - TI Application Note
(added 2/06) |
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Transistor LED Flasher - A simple LED flasher that uses only two
transistors, one capacitor and one resistor. This basic oscillator can have
other simple applications. [designed by Jose Pino] |
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Transistor LED flasher - This circuit has a lot going for it. For one thing,
it only consists of two transistors, two capacitors and four resistors. That also
means it consumes very little power. You can control the flash rate by changing the
size of the 100k resistors (100k makes for a pretty slow rate). You can also control
the duty cycle by using resistors of different values on the two sides.....(added
10/05) |
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Tricolor LEDs create a flashing array 24-Jun-10 Issue of EDN You can build a
matrix of RGB (red/green/blue) LEDs using a simple and inexpensive circuit comprising
the control logic and driver circuit in Figure 1 and some LEDs (Figure 2). The center
RGB LED is the first to come on, after which each sequential LED in the 8×8-LED matrix
follows. This process gives the appearance that the display is alive and moving
outward. This sequence repeats, producing a rainbow effect of colors.....
[Design Idea by Jeff Tregre, www.BuildingUltimateModels.com, Dallas, TX] |
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Trip the Light Fantastic with LED Gadget Freaks - Here is a collection of
the best LED gadgets that have made themselves home in Gadget Freak…..(circuit added
08/08) |
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Two LEDs Perform Rudimentary Spectral Analysis - 09/01/94 EDN-Design
Ideas.....A pair of LEDs having different wavelengths can supply the stimulus for a
rudimentary spectral analysis during quality-control sorting operations. By measuring
the reflectance of each LED, the circuit in Fig 1 can provide information about the
spectral response of the object under test. The circuit's..... EDN is migrating links.
This link is not verified. Search the "title" + "EDN" for new link. |
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Two Signals Easily Control Tricolor LED - 09/14/95 EDN-Design Ideas..... EDN
is migrating links. This link is not verified. Search the "title" + "EDN" for new
link. |
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Two Transistor LED Flasher - This circuit will flash a bright red LED
(500 mcd as an attention getting device or fake car alarm. Componten Values are
not criticl and transistors may be used. Flash duration is determined by R2….
[Bill Bowden's circuit |
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Two-LED Pilot Light - 230 or 115 Vac mains operated Very simple
circuitry..... |
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