Re: 555 timer driver for ignition coil

["B Marshall" <bm-at-bens-stuff.fsnet.co.uk> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

I've also messed about with a similar circuit, which used a couple of
transistors as an osc to 
pulse a 2n3055. This was used to drive an ignition coil. I had no problems
with it, until I 
connected it up to a variac and put about 15v in (not sure of current, but
the spark would ignite 
paper) which blew the 3055.

Regards,
Ben

At 01/09/00 17:02:00, you wrote:
>Original poster: "wsc1914" <wsc1914-at-hotmail-dot-com> 
>
>I have finally suceeded in getting the driver circuit
> http://www.geocities-dot-com/CapeCanaveral/Lab/5322/coildrv.htm ) for an
>ignition coil to work. However, when I disconnet it and connect it the 555
>timer chip sometimes burns out and fails to work any more. What should I do?
>
>I heard somewhere that I need a filter, but what on earth is that, and how
>do I connect it?
>
>Any help would be gratefully received at wsc1914-at-hotmail-dot-com !
>
>Many thanks!
>
>Oliver.
>
>
>
>
>