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Re: KV's and multimeters




From: 	MATTHEW A PRICE[SMTP:ch038map-at-mode.lanl.k12.nm.us]
Sent: 	Friday, November 21, 1997 1:45 PM
To: 	Tesla List
Subject: 	RE: KV's and multimeters


>
> >From: 	MATTHEW A PRICE[SMTP:ch038map-at-mode.lanl.k12.nm.us]
> >Sent: 	Wednesday, November 19, 1997 10:47 AM
> >To: 	Tesla List
> >Subject: 	KV's and multimeters
> >
> >	
> >Last night I finished the driver for the ignition coil useing a 555 timer.
> >I was surprised when I hooked the thing up and it actually worked!
........voltage its putting out? My multimeter is a cheapie that only
goes up to
> >1000 V. Also why does it spark to everything..even when its not grounded?
> >
> >Matthew
> >
> >If you want to make better sparks, put in a variable resistor in the
> 555 circuit. Tune it until you get the longest spark. The best ignition
> coils are the red or blue ones. These are specially for use w/ transistors.
> Also, TV transistors arent the best. IGBTs are the best, but simply a 3055
> is ok. My ignition coil throws 3/4 inch sparks easily. Or, if you want to
> make the longest and fattest sparks, use a thyristor in series with a 1uf
> cap and the primary. Feed this arrangement with 250 VDC. The cap charges up
> and discharges throught the primary. I used 350 VDC and a 4,7uf cap, that
> made 2 1/4 inch sparks!
> Atle Jorstad

Help!!!! The driver that I was talking about is now giving me seriuos
problems. I replaced the TV transistor with a 3055 and the voltage was, as
you said, increased, but the thing quit working. After trying a few things
I decided to try a new 555, and it worked again, but quit again. I decided
not to fry anymore 555 (thats what I was doing, and the things don't grow
on trees!) so I wanted to ask you guys what I am doing wrong. Part of the
problem may be that I need a higher voltage rated wire, but I don't know.
The second time it only ran for a few seconds, and I didn't touch
anything... Please tell me what I am doing wrong

Thanks
Matthew