10 LED O2 monitor

[steve ravet]

The 3914 chip used basically uses a 10 step resistor divider network and
10 comparators to decide which segment to light.  The default input
range is 0-1.2V, but that can be changed to anything "reasonable" like
0-5V, etc.  So the answer is yes, it will work with any circuit that has
an analog output.  I "think" both flavors of UEGO have an output voltage
in the 0-1V range so this circuit should work pretty well out of the box
with either one.  If not the app notes at National have details about
changing the input range.  For more info go to www.nsc.com and search
for LM3914.

I think JC whitney and others sell basically this design in the $20
range, so unless you like building stuff you might just consider buying
one.

--steve

"Romans, Mark" wrote:
> 
> Any way to make this work with an EGOR?
> ----- Original Message -----
> From: "steve ravet" <sravet at arm.com>
> To: <gmecm at diy-efi.org>
> Sent: Tuesday, November 07, 2000 1:21 PM
> Subject: Re: 10 LED O2 monitor
> 
> > Try this link:
> >
> > http://diy-efi.org/diy_efi/projects/O2_LED/O2_LED.html
> >
> > Be warned that these types of meters are of limited use.  They'll tell
> > you rich/lean but that's it.  If you connect it to an EFI car you'll be
> > able to see the ECM command the mixture back and forth across stoich.
> >
> > --steve
> >
> > > Mathieu Blais wrote:
> > >
> > > hi,
> > >     I'm really brand new to tbi injection, seems like I'll really get
> > > into programming prom and modifying prom aswell, I just found the
> > > diy-efi www and I was reading the papers. I found out that there is
> > > somewhere a GN Type tech area where I could maybe find the schematic
> > > on how to build the 10 LED O2 monitor. I would really like if someone
> > > can tell me where I could find that, because the link doesn't work.
> > > Thanks all
> > >
> > > Math B

-- 
Steve Ravet
steve.ravet at arm.com
ARM,Inc.
www.arm.com
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