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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