J.C. Whitney AFR meter

[Bruce Plecan]

May I suggest you check the achives about O2 sensor, and EGOR so at least
you have a clue about what your doing here.
  While you might consider it's output over .9 as useless, I say below that
is about as meaningful,  in general the <$100 sensors are designed to
function as a switch with the on/off point at 14.7:1
Grumpy


| Rex Weatherford wrote :
| > I was looking at the schematic for Dave's meter and had a few
| > questions.
 > What is the LM3914?
 It's an integrated circuit made by National Semiconductor, designed to
| create a bar graph display with a minimum of external components.
| National's data sheet is at http://www.national.com/pf/LM/LM3914.html .
The
| part should be available from most full-line electronics supply houses
| (which leaves out Radio Shaft).
| > It says I can buy a meter like this from JC whitney for $20?  Is that
| > true?
| Not quite.  Current price is $36.  See
| http://www.jcwhitney.com/product.jhtml?CATID=4571 .
| > How are these used...  I know that my ECM looks for values
| > between .100v
| > and 1.1v.  And that my EGO sensor has to warm up before this means
| > anything.  Correct?
| Basically.  The LM3914 uses 1.2v as the reference (full scale), I assume
the
| Whitney meter does the same.  I believe the EGO sensor output is basically
| meaningless above about 0.9v.
| Randall


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