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LED (Light
Emitting Diodes) Circuits Page 11a
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Last Updated on:
Wednesday, November 29, 2017 05:40 AM |
| Circuits Designed by Dave
Johnson, P.E. : |
- Simple
WHITE LED NIGHT LIGHT
This simple circuit is designed to plug into a standard AC electrical outlet.
It uses four super bright white light emitting diodes (LED) in conjunction with a
capacitor coupled full wave rectifier circuit. The LEDs are mounted in a box and are
angled slightly to bounce the light off of a nearby wall. The light should
last about 10 years. The circuit draws less than one half of one watt of power
and can therefore run continuously. In spite of the low power, the LEDs
provide sufficient illumination for most night light applications. Circuit
component values for both 120vac and 240vac are shown.
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- Super
Bright 3v Powered LED Flasher
I have posted several kinds of LED flashers
over the years. This is yet one more flasher, designed to flash any high power
LED of any color. It hits the LED with a 25ms 250ma pulse once every 2
seconds. This works out to an average current about 3ma. It is powered
by any 3v source. I suggest two AA cells but a single 3v lithium coin type
cell will also work. With fresh AA cells, the light should flash for about two
weeks. The light flash is very intense and is perfect for any attention
getting night time application.....
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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Simple Circuit Drives Latching Relays - 02/01/96 EDN-Design
Ideas.....Figure 1 shows a low-parts-count circuit that can drive one-
or two-coil latching relays. Latching relays are useful in sensitive
analog designs. The 74ACT174 hex flip-flop has ample capability to
drive the Aromat TQ2E series of latching relays. Both windings for the
TQ2E-L2-5V two-coil relay..... [Design Idea by Roy McCammon, 3M
Austin, TX] |
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Simple LED Constant Current Source - Chip manufacturers are
always coming up with ever more sophisticated constant current driver
chips for LEDs. We have included this design for those of you who
prefer a more cheap and cheerful solution.….must register on this
site.... [Published in Elecktor July/August 2010] |
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Simple LED flasher circuits - By simple, I mean that these
circuits only flash one or two LEDs. This is opposed to the
light chaser circuits that can flash four or more. Of course, the
simplest LED flasher is simply to use a flashing LED. The problem with
that approach is you have no control over the flash rate.....(added
10/05) |
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Simple 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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Simple Photodetector Circuit - I´ve designed this simple circuit to test
a photodetector. I got the detector from an old 5 1/4" disk drive. If you can get
one, you will find two photodetectorts: one is used to sense the density (double
density or high density)(schematice added 6/07) |
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Simple single cell white LED driver uses improvised transformer -
15-Feb-07 Issue of EDN Minimal component-count circuit boosts a single
cell's voltage to light an LED..... [Design Idea by Jim Grant, Scientific
Controls, Orlando, FL; Edited by Brad Thompson and Fran Granville] |
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Simple two transistor circuit lights LEDs - 9-Apr-09 Issue of EDN
A previous Design Idea describes a circuit that uses an astable multivibrator to
drive an LED (Reference 1]. The circuit in Figure 1 uses a simpler alternative
approach. The circuit uses a 2N3904 NPN transistor and a 2N3906 PNP transistor,
which operate as a high-gain amplifier..... [Design Idea by Barry A Tigner,
Michigan State University, East Lansing, MI] |
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Simple White LED Night Light - This simple circuit is designed to plug
into a standard AC electrical outlet. It uses four super bright white light
emitting diodes (LED) in conjunction with a capacitor coupled full wave rectifier
circuit. [Designed by David A. Johnson] |
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Simplest LED Flasher circuit - (schematic / circuit added 6/07)
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Simplified PC Connections for Gpib Instruments - Aligent Application
Note (app note added 4/08) |
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Simplified white LED flasher operates from one cell - 26-May-05 Issue of
EDN 1.5V circuit flashes white LED..... [Design Idea by Anthony H Smith,
Scitech, Biddenham, England; Edited by Brad Thompson] |
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