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



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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