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4hv.org :: Forums :: General Science and Electronics
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timer delay?

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Steve Conner
Tue Dec 23 2008, 03:44PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
It won't work off 9V because the zener voltage of the 2N3904 "Ghetto Zener" is too high. Try replacing it with a 4.7V zener.
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Mads Barnkob
Tue Dec 23 2008, 03:45PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Link2 here you can find datasheets for almost every component found on the surface of earth, its not a bad idea to research simple things as voltage ratings yourself :)

if its just for a delayed rocket igniter, why not used a long piece of wire, atleast then you decide when to fire it, it would be sad to activate the timer, run and look back to see the rocket tilt before launch :)
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Solidacid
Tue Dec 23 2008, 10:39PM
Solidacid Registered Member #1430 Joined: Sun Apr 06 2008, 11:12AM
Location: Ã…rhus, Denmark
Posts: 102
MadsKaizer wrote ...

Link2 here you can find datasheets for almost every component found on the surface of earth, its not a bad idea to research simple things as voltage ratings yourself :)

if its just for a delayed rocket igniter, why not used a long piece of wire, atleast then you decide when to fire it, it would be sad to activate the timer, run and look back to see the rocket tilt before launch :)

good to know! :D, if i had know the voltage rating of the transistor was the limeting factor i would have searched for it myself :P

what about just running it of the 18v battery, would that work?

at first i thought i would just have used a cable-drum but i found out(the hard way) that i would loose to much current that way, i couldnt get the wire to glow at all
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