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Discussion Starter #1
I am looking for something... but I have yet to come up with any ideas on where to find it. I need an electronic countdown timer that can be set for anywhere from 1-10 seconds. It will be used to trigger a strobe... but I only want the strobe to flash once, so alarm clocks and the such are out.


I dont know if Im missing any important information or not... so any ideas or questions are greatly appreciated. Thanks.
 

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Well you can go all fancy and built a circuit using a 555 timer. Or you can use a capacitor that will disharge thru a resistor and trigger the gate of a transistor. But either way means a great deal of soldering...

Or maybe go all oldschool with some relay logic and an oven timer...
 

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Discussion Starter #3
Vash said:
Well you can go all fancy and built a circuit using a 555 timer. Or you can use a capacitor that will disharge thru a resistor and trigger the gate of a transistor. But either way means a great deal of soldering...

Or maybe go all oldschool with some relay logic and an oven timer...

you know... I had your myspace page on my screen, and was about to click "send message" but suddenly thought "maybe he wouldnt know?". lol.

Anyway, soldering = Not a problem at all. I am looking for the most cost efficient way to achieve my goal. All I really need is a way to press a button, initiating a 3 second countdown. When 0 is reached, it discharges a strobe.
 

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Oven timer and relay will probably be your best option. I'd draw you a schematic, but I need more info on the strobe
 

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The oven timer would be the easiest. You could do the 555 timer and use a variable resistor and create the same effect. Depending on the number of volts and amps the strobe pulls you might need to run it though a transistor so you dont fry your timer.

Sepias
 

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Discussion Starter #7
Okay, I found the strobe kits I was looking at.

Chaney Electronics


I was talking with my father last night about the project, and he suggested that maybe I could set it up with a shock sensor type trigger, and the delay could be the capacitors charging for the flash... no arm switch. So when the device senses the shock, it triggers the strobe... the caps charge, then discharge. The shock sensor trigger he described is a pole with a ring around the outside. When the pin is moved, it hits the ring, thus triggering the chain.


Would this actually work?
 

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ZX6R1033 said:
Okay, I found the strobe kits I was looking at.

Chaney Electronics


I was talking with my father last night about the project, and he suggested that maybe I could set it up with a shock sensor type trigger, and the delay could be the capacitors charging for the flash... no arm switch. So when the device senses the shock, it triggers the strobe... the caps charge, then discharge. The shock sensor trigger he described is a pole with a ring around the outside. When the pin is moved, it hits the ring, thus triggering the chain.


Would this actually work?
I think you should explain what it is you plan to do with this thing. Yes, its possible to activate it in the strobe in that way. The hard part is actually turning it off. The acceleration sensor (the ring and wire thingie), can turn on a locking relay circuit, but you would need another timer to turn it off (or something timer-esque)
 

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Discussion Starter #9
Vash said:
I think you should explain what it is you plan to do with this thing. Yes, its possible to activate it in the strobe in that way. The hard part is actually turning it off. The acceleration sensor (the ring and wire thingie), can turn on a locking relay circuit, but you would need another timer to turn it off (or something timer-esque)

I am attempting to make a simulation flash-bang for practice in room clearing. A strobe is the best thing I can think of to simulate the flash... and this would be reusable, which is important. I need a way to either trigger it, or have it sense the impact when we throw it, but I only want it to flash once.
 

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I'm sorry I asked.

Ok, you need a 9v zener diode, a capacitor, a battery, and your impact sensor. Let me see if I can find a scanner
 

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Ok, got it. The thing is, I have no idea what size cap you are going to need, it depends on the draw of the flasher unit. If its too small the unit wont flash, if its too large it will flash more then once. If its way too large it will set your battery on fire.

A brief explanation: Capacitors have virtually no resistance, thus charge instantly. The cap here will charge thru the impact sensor (you have to righ some that will be bounce free, I.E only touch the outer ring once, not twice) once the cap is charged, it will discharged thru the flasher unit, and the zener diode will regulate the voltage (without it voltage will spike, because capacitors store charge, not potential). One impact, followed shortly by a flash. Good luck.

Oh yeah, it scanned sideways.. Sorry
 

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