Whipper Snipper Project :)

[Wes Branchflower]

Thanks for the info! I just happened to goto the electronics store today, 
and though i should get a few parts, an opto-isolator, a 2n2222a transistor, 
and a 2n3055, and a few leds. Then I came home and read this email!! Hmm, i 
hope this good luck will continue!!
Thanks for your time, i'm gettin their slowly ;)

Cya


>From: Terry_Sare at Dell.com
>Reply-To: diy_efi at diy-efi.org
>To: diy_efi at diy-efi.org
>Subject: RE: Whipper Snipper Project :)
>Date: Thu, 18 Jan 2001 15:14:31 -0600
>
>I used a 2n3055 back in 1981 to convert my 68 bird to electronic ign. Works
>but get a large heat sink, a diode to clamp the collector to ground. Remove
>the ballast resister from the +12V line and hook 12V directly to + on coil.
>Connect collector to - lead, connect cathode of diode (1n4005 or something
>like that) to the - lead. connect the emitter and anode to ground. Your  PC
>LPT outputs 5 volts, connect the base (through resister) to PC, however may
>not drive the 2n3055 hard enough without toasting LPT port. Need to put a
>2n2222 driver in line cause hfe on 2N3055 is very low. Go search Web for
>hooking up things to LPT port -- like servo motors -- that will show you 
>how
>to boost output voltages and isolate your PC from the nasty thing that go
>bang. IGBT are better but can be little harder to get hold of, like not at
>radio shack or local electronic supply store. 2n3055 is good to 20Khz or
>better -- you won't reach that even with a two stroke.
>
>Isolate your PC from this stuff!!!!!!!!! REALLY. Don't want to replace that
>PC.
>
>Terry
>
>-----Original Message-----
>From: Wes Branchflower [mailto:hemi_265 at hotmail.com]
><snipped>
>
>I have a 2N3055 PNP transistor, which is rated at being able to switch
>15AMPS.
>
>Is this all I need to switch the coil? Is it that simple? Are there special
>automotive grade transistors for this purpose?
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