555 EFI

[Bruce Plecan]

-----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
>
>