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Sound triggered flash - If you wish to take a picture of a fleeting event which generates a
sound, you can do it with this sound activated trigger. It does not require any power supply: it feeds on the
high voltage available on the flash trigger terminal. Any economic ceramic microphone is suitable for the
purpose. . .
Special Effects from a Six Pack - Four channel Sequencer to Analog Dimmers and idea how to couple relay to
the circuit. . .
Strange LED sequencer - This bizzare but simple PWM circuit fades from LED to LED. This
deceptively simple sequencer actually pulse width modulates the LEDs as it fades from one LED to the next. Bulbs
will last much longer when driven in this gentle manner; add FETs or transistors to the outputs if you wish to
drive bulbs. You can reconfigure the capacitors. . . [Circuit by Stepan Novotill]
Strange LED sequencer - This bizzare but simple PWM circuit fades from LED to LED . . . [Circuit
by Stepan Novotill]
Strobe from Flash - After using a disposable camera, you can build a strobe light (flashing
light) with one simple modification. (6/02/2006) . . . [Jose Pino]
Strobe Light - Designed as a companion to the LX800, can also be used by itself. . .
[Rod Elliott (ESP)]
Strobe Light - 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. . . [Design by Aaron Cake]
Strobe Light - 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 and causes the triac to turn on. This allows
the trigger transformer T1 to send a very High Voltage. . . [Randy Linscott]
Strobe Light 12 Volt Coil Powered - This
circuit will give provide a Good Strobe Effect for a variety of Portable Uses. . . . [G.L. Chemelec]
Strobe Trigger - These pictures are scenes frozen by a flash unit that is triggered by the
action being recorded. They were made by setting up a shot, opening the camera shutter using its "bulb" setting,
and carrying out some action that opened or closed a circuit to trigger the flash. The balloon pictures were
taken by triggering the flash when the balloon began to shrink after being popped. In most cases the balloon had
a strip of foil attached to it with probes pressed against it on two sides, with a circuit interrupted when the
foil pulled away from the probes. . . [John DuBois designer]
Strobex Schematic - Schematic only for a Variable Intensity Variable Speed Stroboscop, no
circuit description given. . . . [Samuel M. Goldwasser]
Strobo Control - Remote controller for professional lighting system stroboscope, controls
the flashing speed. . . . [Design and copyright by Tomi Engdahl]
Stroboscope trigger circuits - This circuit typically uses a voltage around 300 volts for the main high
voltage supply and needs a low voltage supply of typically 6 to 15 volts. . . . [Written by Don Klipstein]
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 . . . [Circuit by David Johnson P.E., 04/22/09]
Super Simple Flasher - File contains several designs, please scroll to find this circuit. Here
is a simple flasher circuit that uses no resistors! However, it relies on leakage in the base of the PNP
germanium transistor and only some will work; be prepared to try a few. If you add a 100k resistor from the base
to the collector of the PNP, the circuit will work with most germanium transistors and will work down to 1 VDC!
The NPN should be a silicon type. The 100 uF may be replaced with a 22uF in series with a 5k resistor and it
would be a good idea to add 39 ohms in series with the base of the NPN (but then the circuit starts to lose its
charming simplicity). . . . [Charles Wenzel (unless otherwise noted)]
Synchronous Crossing Light Flashers - In the synchronous flasher control the oscillator is running at all times
and the power to each set of flashers is turned on or off by the control circuit for that crossing. This allows
any number of flasher sets at different crossings to controlled individually and yet flash in unison. scroll down
for this circuit. . . [from Rob Paisley's Model Train web site]
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