signal from coil and back emf......

Dave J. Andruczyk dave at scarlet.buffalostate.edu
Thu Mar 5 00:07:53 GMT 1998


> 
> I'm using a 555 timer set up as a one shot firing an injector. To trigger it I want to 
> use the negative of the coil. The circuit works great on the bench 
> but the once I connect it it fries the input.... I think this is 
> because of the back emf from the coil so I put a 12v zener across the 
> input.
> Can anyone help me with a filter/clipper to stop this.

look ate the efi332 site,  the injector, and ignition driver boards have
an excellent circuit, that drives a coil safely from a ttl circuit..

the mirror is at my site, at http://tech.buffalostate.edu/efi/efi332


dave





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