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Fader switch uses inexpensive controller - 12-Nov-09 Issue of
EDN Control the brightness of an LED or incandescent lamp.....
[Design Idea by William Grill, Lenexa, KS] |
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Fading LEDs - 2-strips of LEDs fading in a complementary manner
9 Volt Battery-operated portable unit..... |
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Fading Red Eyes - can be used to slowly illuminate and fade a
pair of red LEDs (added 4/02) |
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Fake Car Alarm Light - Whenever the car’s ignition is turned
off, this circuit activates a flashing LED, which can be positioned to
appear as an active alarm system..... [Designed by David A. Johnson] |
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Fancy LEDS - The idea of this project came from my youngest son.
He was dreaming of a small tool able to write symbols or pictures on a
screen. As a graphic LCD (even bought at Crownhill :) ) was too expensive
(or too easy??), the solution adopted was to pilot a matrix of Leds.
This way,.....(project added 07/07/07) |
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Fantastic Atom Expander (Aaron Cake) - Here is the schematic, PC
board pattern, and parts placement for a "Fantastic Atom Expander".
This circuit produces an "exploding atom" effect using 98 LEDs.
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Fine Control SuperBright LED Pulser - Four timing controls, 12V
supply. Suitable for Halloween or Christmas props. .....
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Five- to 10-LED flashlight circuit runs at 3V - 15-Dec-08 Issue of EDN
With this simple circuit and easy-to-find components, you can convert bulb flashlights
into energy-efficient, bright LED flashlights..... [Design Idea by GY Xu, XuMicro,
Houston, TX] |
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Flashing Heart - This circuit was made for my wife's birthday. It is capable
of flashing five strings of LED's with different frequencies. It also has a connector
for an 8 Ohm loudspeaker and two connectors for the small PCB's that are contained in
musical greeting cards. In this way the circuit will play alternatingly two room
filling tunes at regular time intervals. After a w.....(electronic design added 6/07)
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Flashing High Intensity LED 3rd Brake Light - This circuit to make a
flashing3rd brake light assembly was designed to be easy to locate all the needed
components and reasonably in expensive to build. (added 4/02) |
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Flashing Indicators - Need to flash "turn indicators" using a 555 and a
single 20 amp relay. Here is our suggestion. The timing resistor needs to be selected
for the appropriate flash-rate. |
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Flashing LED - This simple project makes a good low-cost first project to
check your soldering skills and learn to identify common components. The LED flashes
at about 3Hz (3 flashes per second).… [Designed by John Hewes] |
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Flashing LED Advertising Badge #1 - I have seen numerous Flashing light
badges at trade shows and conventions. They are often handed out as gifts to promote
some business. The devices often use inefficient circuits, which cause the battery
power source to be quickly depleted. My circuit is simple but efficient enough to
provide months of continuous LED Flashing. It also has a tiny push-button switch to
turn on and off the light Flashing, extending battery power. …. [Hobby Corner Circuit
by Dave Johnson] |
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Flashing LED Advertising Badge #2 - This circuit is similar to schematic
Flashing LED Advertising Badge #1. It uses a CD4013 dual D Flip/Flop IC.
The 74HCT74 IC in Flashing LED Advertising Badge #1 does not always work. As in
Flashing LED Advertising Badge #1, a single lithium battery will provide months of
continuous LED flashing. It also has a tiny push-button switch to turn on and
off the light flashing..... [Designed by David A. Johnson] |
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Flashing LED Power Indicator Draws Low Current - This circuit Flashes a
power indicator LED to keep the average current low..... [Designed by David A.
Johnson] |
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Flashing LED with PIC12F629 - This is the first example that you should to
know how to set output pin. In this example, GPO is set as an output. LED1 will be
turn-on when GP0 is set high and LED1 wiil be turn-off when GP0 is set low. This
example use 4MHz internal clock. ….(electronic schematic added 11/08) |
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Flashing LED-based Solar Engine - Voltage-Controlled Solar Engine:This
design uses a flashing LED to determine the solar engine's voltage trip level.
(added 11/05) |
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Flashing Railroad Lights - This circuit flashes two red LEDs for a model
railway crossing. |
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Flashy Christmas Lights - .... |
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Flicker Lamp - Having bought a cute little ‘paraffin lamp’ from a cut price
shop, I decided to make it a little more interesting. Its battery powered of course
but its continuous shine and simple on / off ‘wick control’ did not make for anything
like a close simulation of the real thing. So, I replaced the on / off control with a
variable potentiometer and I added flicker!.....(added 04/04/04) |
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Flickering Fire Effect - This simple circuit uses four low-Wattage colored
bulbs and four fluorescent lamp starters to make nice flickering flame effect. (added
4/02) |
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Flickering Fire Light - This may well be the world's only discreet logic
circuit to generate truly random output. It makes an excellent candle flicker light
for your Halloween pumpkin, and looks much more authentic than a shimmer light
wherever a good a simulated flame effect is required. I do not guarantee the accuracy
or safety of any information herein..... [Circuit by Stepan Novotill] |
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Flickering Lights - Halloween flickering lights (electronic circuits
added 11/06) |
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Flying inductor LED series voltage boost circuit - A circuit that goes in
series with a white LED and a 1.5 volt cell to make > 3 Volts to drive a white
LED.....(schematic / circuit added 6/07) |
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Four DIPs provide as many as 80 sequential-LED outputs - 21-Aug-08 Issue of
EDN A simple circuit uses HCMOS parts and adds one 74HC540 to multiplex the
outputs of two 4017 counters for as many as 80 outputs..... [Design Idea by Greg
Carkner, Cobourg, ON, Canada] |
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Garage Light Indicator LED - This is the simplest possible way to power an
LED off 115VAC. I epoxied a high-brightness yellow LED into the switch plate to
my garage light. The light switch is inside my house, but the garage light cannot be
seen when the door is closed. This has caused me to leave the garage light on
overnight many times until I created this solution. I have outdoor
lights.....[Designed by Andrew R. Morris (added 09/05)] |
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Get More Than Three Colors from a Dot Matrix LED - 06/05/98 EDN-Design
Ideas.....To generate high voltages with proper insulation between "hot node"
and rest of circuitry, a car ignition coil can function in place of a
high-voltage transformer. se coils have voltage ratings of approximately 20 kV.…
[Design Idea by W Kurdthongmee, Nakorn Si Thammarat, Thailand] |
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Grantronics Projects Christmas Tree - flashes LEDs mounted to Christmas tree
shape PCB, kit from kitsrus.com (added 4/02) |
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Halloween Flashing-Eyes Badge - Two-LEDs act as eyes following the rhythm of
music or speech. 3V Battery-operated device suitable for pins or badges.
(added 4/08) |
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Heart of LEDs - One of the requests we received after publication of the
Christmas Star was "can you do different shapes?" Well, with Mother’s Day coming up
soon, we thought a heart would be appropriate. Now you can have something different to
give to that special Mum or Grandmother. or you may be able to redeem yourself if you
forgot St Valentines Day! Either way, the Heart.....(added 4/05) |
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High Efficiency 12V White LED Driver - 11 white LEDs [G. Forrest Cook] |
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High Efficiency ThinSOT White LED Driver Features Internal Switch & Schottky Diode
- DN325 Design Notes (Linear Technology) (app note added 1/06)
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High Efficiency White LED Driver Guarantees Matching LED Brightness - DN267
Design Notes (Linear Technology) (app note added 1/06) |
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High Efficienty ThinSOT White LED Driver Feature Switche & Schottky Diode -
Linear Technology Magazine Design Ideas May 2004.....[App Note] |
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High Efficienty White LED Driver Guarantees Matching LED Brightness - Linear
Technology Design Note 267.....[App Note] |
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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 a constant current, any
LED color can be used. I have also shown how you could use an array of 7 LEDs,
wired in parallel. This array may not produce as much light as the single power LED
but the array would be cheaper to build..... [Designed by David A. Johnson] |
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High Power IR LED Driver using the PIC16C781/782 - Microchip Application
Note Published 26-Sep-02 (app note added 2/06) |
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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. You can buy them in just about any color in the rainbow but white
seems to be the most popular. One application for these devices is a flashing
light. If the flash duration and flash rate is kept low, the average current can
be low enough that even a small battery can last quite a while..... [Designed by David
A. Johnson] |
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High Power LED mood Lamp - ….(electronic schematic added 08/08) [Site is
under construction right now] |
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High Voltage Power Supply using a Highly Integrated DC/DC Converter TPS61040
Slva137.Htm, 0 Kb - TI Application Note (added 2/06) |
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High-power LED drivers require no external switches - 19-Jul-07 Issue of EDN
Suiting a variety of applications, these circuits transform a switching regulator into
a current source for driving power LEDs..... [Design Idea by Alfredo H Saab and Steve
Logan, Maxim Integrated Products, Sunnyvale, CA] |
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High-side current-sensing switched-mode regulator provides constant-current LED drive
- 14-Apr-05 Issue of EDN Drive LEDs with constant-current source.....
[Design Idea by Bradley Albing, Philips Medical Systems Inc, Cleveland, OH; Edited by
Brad Thompson] |
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How To Control Multiple Leds - Multiplexing the I/O ports, you can control
many leds using a few ports. (circuit added 5/06) |
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HV9931 Unity Power Factor LED Driver - Supertex Semiconductors (app
note added 2/06) |
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