RE: My findings on 555 Ign. Coil spark maker thingys

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Michael J Strube by way of Terry Fritz <twftesla-at-qwest-dot-net>" <mjstrube-at-artsci.wustl.edu>

Bob,

	I've played around with that design too and have found that putting a
transistor (a 2N2222 in my case) between the 555 and the 2N3055 helps a
lot. That way you can keep the 555 output current at a more reasonable
level (by using the 2N2222 to step up to the 2N3055).

Mike

-----Original Message-----
From:	Tesla list [SMTP:tesla-at-pupman-dot-com]
Sent:	Friday, November 30, 2001 9:17 PM
To:	tesla-at-pupman-dot-com
Subject:	My findings on 555 Ign. Coil spark maker thingys

Original poster: "Bob Bozarth by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<jbdetails-at-prodigy-dot-net>

    Aside from a few major components, all of my first coils effort has been
spent on the Ignition coil driver from
<http://www.geocities-dot-com/CapeCanaveral/Lab/5322/coildrv.htm Except I
changed the single to a
dual coil. I did this by connecting the - to + and the + to - on the two coils.
Then the one each of the output wires from the timer went to one of the -/+
crossover wires on the coil. It worked really good, but I had some extra
transistors and wanted to experiment a little. I found a MJE3055T, which is the
same as a 2N3055 but in the smaller TO220 package.Worked twice as good, yet
barely got warm where the 2N3055 wood got hot enough to sizzle a moist
fingertip. I just wanted to share this tidbit. For all I know it's common
knowledge to most but I feel good when I discover things like this. If only I
could figure out how to not toast my 555 timers, there're so sensitive. I know
they are cheap but 2 to 3 a day? ( I experiment allot!)
 
    Bob Bozarth
    Experimenter