Whipper Snipper Project :)

[Wes Branchflower]

I was toying round with a PC, and a 2stoke whipper snipper engine the other 
day. I had a relay running from the PC LPT port. The engines points were 
also connected to the PC. The relay powered a junkyard automotive coil, 
which went via a HT lead to the spark plug.

So basically I was just putting a PC in the middle of the system, 'to see 
what happened'.

The thing actually started :) But didn't like to run unless RPM was kept at 
a certain critical value (because of the relay switcing speed)

I'm relatively inexperinced with electronics. I'm now wanting to use a 
transistor to switch the current to the coil, instead of the slow relay.

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?

Thankyou for your time and patience.



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