555 EFI

[thergen at svn.net]

Okay, who's gonna be the first one to say it would be easiear to skip all
the op-amps and use a PIC and some code?  ;) 


On Sat, 16 Jan 1999, Bruce Plecan wrote:

> 
> -----Original Message-----
> From: Hugo Villeneuve <villen01 at gel.ulaval.ca>
> To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
> Date: Saturday, January 16, 1999 12:49 PM
> Subject: Re: 555 EFI
> 
> 
> snip
> 
> I maybe WAY over my head here, but.....
> How about dividing the 0-5 by 3 (voltage divider), and then adding that with
> a voltage with the summing amp., that way I don't need a second power
> supply???.
> 
> 741 or 358, which is better for an auto application?.
> Bruce
> 
> 
> >First: Pass your 0-5V signal through a summing amplifier (one input is
> >3.333V and the other your signal). The resulting signal should be
> >3.333-8.333V.
> >
> >Second: Pass your 3.333-8.333V signal through am amplifier with a gain of
> >0.333, or 1/3. Your signal should be 3.333-5V.
> >
> >Of course, this approach requires an operational amplifier (like the 741 or
> >358) rather than a comparator like the 324. This idea was not tested
> >experimentally so...
> >
> > Hugo Villeneuve
> >
> >
>