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Welch Scientific Model 2153C Stroboscope |
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White LED driver touts high efficiency - 12-Jun-03 Issue of EDN
White LEDs, the most recent addition to the LCD backlight, find common use
in providing backlight for color LCDs. Thanks to their size and
white-light output, they appear in small, portable devices with color
displays, such as PDAs and cellular phones. Like other LEDs, a white LED
needs a constant-current source—typically, on the order of 15 to 20 mA.....
[Design Idea by Dimitry Goder, Sipex Corp, San Jose, CA] |
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White LED Stroboscope With Constant Duty Cycle & Constant Current Drive
- Finally, white LED's are bright enough to use in a practical
stroboscope. This circuit can operate as a bench-top stroboscope
that, in conjunction with an oscilloscope or frequency meter and bench top
power supply can accurately measure rotational speeds, or it can be
operated hand-held from a single 9V battery,.....(schematic / circuit
added 6/07) |
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Wig/Wag LED Flasher - This simple circuit will flash two LEDs in an
alternating fashion.….[Designed by David A. Johnson] |
Wireless LED Flasher
There are times when you would like to flash a LED through a thick plastic case
without wires. The circuit below performs this feat. It can be powered
from a supply ranging from 3v to 6v. It draws about 300ua of average current at 5v. It
uses a low power op amp as a pulse generator. A negative going pulse from that
generator gates a power oscillator on for about 20ma. That oscillator is
connected to a series resonant circuit, which drives a small coil....[Designed by
David A. Johnson] |
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[_OLD-ads-dont_upload/OLD I-ADS from web/ad-djandassoc.htm] |
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Xenon Flash & Strobe Page - (electronic diagram added 6/03) |
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Xenon flash valve - An experiment of the xenon flash valve. (added
10/05) |
Xenon Flasher (Colin Mitchell) -
You are going to like this project. It costs less than $3.00, contains six BUILDING
BLOCKS, re-cycles a disposable flash camera and you are going to learn a lot about
electronics.
Everyone has seen a disposable flash camera…. |
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Xenon Strobe Light - A xenon flash tube is a triggered gas discharge device.
A voltage may be impressed across the tube and it will not conduct until the xenon gas
is ionised by an external high voltage (typically 3 to 5kV). Once triggered, the gas
becomes a very low impedance, and discharges the storage capacitors in about 1ms (this
varies considerably, but this figure is fine for basic calculations) [Rod Elliott
(ESP)] |
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Xenon Strobe Light (Aaron Cake) - Disco anyone? Actually, this strobe serves
a much more useful purpose then making it look cool when you dance in the dark. You
can use it to view fast moving objects, look for craks in PC boards (hold the strobe
on the trace side of the board and look from the component side), and it is a great
attention getter in a store window. |
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Xenon Strobe Light (Linscott) - The way that this circuit works is as
follows. The AC line voltage is rectified by D1 and D2 which connects to a voltage
doubler circuit made up of the two 22uf capacitors. The Flash Freq. Pot and the 10uf
capacitor charge up which triggers the Diac ….(added 4/02) |
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