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From: Jim Yanik
Subject: Re: Capacitive Discharge Circuit For Pyrotechnic Use
Date: Mon, 16 Sep 2002 21:41:58 +0000 (UTC)
Organization: Friends of Lummox
NNTP-Posting-Date: Mon, 16 Sep 2002 21:41:58 +0000 (UTC)
Tony Williams wrote in
> In article ,
> BobSobieski wrote:
>> Some CD systems are advertised as having nearly instantaneous charge
>> time, and the typical working voltage seems to be approximately 200v.
>> Can anyone give me a sample schematic, or point me to an appropriate
>> source of same?
> I used a 555, driving a MOSFET ringing choke
> dc-dc converter. The output C was about 2000uF.
> A comparator Enables the 555 below 55V and
> Disables it when the voltage reaches about 65V.
> It takes about 1 Sec to charge the cap from zero.
> We have a 10 ohm resistor in series with the
> output from the cap.
> 200V is only used on some systems where they
> wire dets in series.
Or you could take apart and mod a cheap disposable flash camera.I've heard
some stores will let you have the camera remains for free.
Jim Yanik,NRA member
remove X to contact me
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