[DML] Re: RPM relay (was I think my fuel pump...)
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[DML] Re: RPM relay (was I think my fuel pump...)



It may be superfluously, but even my Pontiac Transport from 1996 does 
prime when the ignition is turned on.
I guess there are many car that have fuel pumps working that way.

Welmoed.


--- In dmcnews@xxxxxxxxxxxxxxx, "Steve" <p2freak@...> wrote:
>
> Group.
> 
> The circuit in Dave's drawing is a one shot monostable circuit. 
> Meaning as soon as there's power, the output to relay coil is
> energized, closing the contacts.  So the RPM relay is set to pre-
prime
> before there's a tach signal.
> 
> Don't know if the new relays have the same schematic.
> 
> 
> Steve
> VIN#04421
> 
> --- In dmcnews@xxxxxxxxxxxxxxx, doctorDHD@ wrote:
> >
> >  
> >  
> > For Dave S and anyone else interested...  I posted the schematic 
of
>  the RPM 
> > relay in the files section, back in July 2005.  It's still  
there.  Now 
> > someone with intimate knowledge of how a 555 timer works, will  
need
> to decide if it 
> > is supposed to prime or not.   
> >  
> >  
> > 7b. Re: RPM relay (was I think my fuel pump...)
> > Posted  by: "Dave Swingle" swingle_dmc@ daveswingle2
> > Date:  Tue May 1, 2007 11:36 am ((PDT))
> > 
> >
>




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