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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. 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.
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.....
Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
Safety Flasher - This circuit alternately flashes two
high-brightness LEDs as a safety measure during jogging or walking.
The LED’s can be mounted on clothing or a belt. The circuit draws a
precisely controlled 10mA in order to conserve battery life. Also, the
battery voltage can drop to the LED voltage plus about .5 volts before
there is a noticeable....Designed by Andrew R. Morris (added
09/05)
Scheme provides high-side current-sensing for white-LED drivers -
19-Feb-04 Issue of EDN White LEDs find wide use in backlighting
color-LCD screens in most portable devices, such as cellular phones,
PDAs, and MP3 players. Multiple LEDs often connect in series to ensure
that the same current flows through every LED. To forward-bias these
LEDs, a voltage of 10 to 16V comes from an inductor-based boost
regulator, such as an SP6690..... [Design Idea by Dimitry Goder, Sipex
Corp, San Jose, CA]
Senses & displays ambient light intensity - 11/09/06 EDN-Design
Ideas.....LED doubles as photosensor and visual indicator of ambient-light
intensity..... EDN is migrating links. This link is not verified. Search the
"title" EDN for new link.
Series White LED Driver - National Semiconductor Application Note LM3590
November 2003.....[App Note]
Seven Component Regulated LED Lamp - This is a minimal parts lamp made
with four white LEDs. It features regulated light output from 10V to around 20V
and works well as a flashlight. [G. Forrest Cook]
Signal processor adds LED display - 6-Jun-96 Issue of EDN
Designers using the Texas Instruments TSS400, a versatile 4-bit sensor-signal
processor, may find the circuit in Figure 1 useful as a replacement for, or an
adjunct to, the IC's built-in display capabilities..... [Design Idea by N Thomas
Christman, Zablocki VA Hospital, Milwaukee, WI]
