10 LED O2 monitor

[Mike Martone]

call national semiconductor ( the manufacturer) and request a sample for
eval purposes....you won't find these things at whitney or any other auto
supply house...when i think about it, you should be able to do this through
the web site....oh yeah... you're not restricted to the 3914... if ya want
to go through the excercise.. you can get the same result with a bank of
comparators and a resistor pack wired so that each comparator closes at some
voltage that is set by the divider circuit from the resistor pack...the
comparator then fires its respective led and makes an omelet... or.. you can
do this really easily by going to radio shack and paying 2bucks for the 3914
or 3916 (if you want a better operating temperature range)... in fact.. why
even screw around with an led display when all you need is a 0-1V analog
volt meter....try to find an old simpson 260 or triplett 310 VOM. it'll do
just fine and will probably have a better response time for that matter.

good luck,
bonehead
----- Original Message -----
From: Mathieu Blais <fireb76 at videotron.ca>
To: <gmecm at diy-efi.org>
Sent: Monday, November 13, 2000 11:36 PM
Subject: Re: 10 LED O2 monitor


> hi steve,
>
>     I checked with nsc and they only seem to sell it if I buy 20 or more,
> and I don't need that many!  That nsc place seem to be only selling at
> companies, am I correct?  I also checked jc whitney and I can't find them
> listing somekind of o2 monitor.  Can you give me your idea, like I really
> don't know nsc, and I'm brand new on here.  Thanks.
>
>     Math Blais
>     fireb76 at videotron.ca
>
> ----- Original Message -----
> From: "steve ravet" <sravet at arm.com>
> To: <gmecm at diy-efi.org>
> Sent: Tuesday, November 07, 2000 5:40 PM
> Subject: Re: 10 LED O2 monitor
>
>
> > 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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