[Wbo2] simple warning LED display

[James Holland]

I spoke too soon, I just had a look at the actual numbers. The difference between stoich and 15:1 is only around 0.025V which is around 1%, that would need a very high degree of accuracy, a precision reference, a comparator with a pretty good spec (LM139 maybe) and 0.1% resistors. It might be possible, what sort of operating temperature range are you aiming for?
  ----- Original Message ----- 
  From: James Holland 
  To: Tommy ; wbo2 at diy-efi.org 
  Sent: Sunday, September 18, 2005 6:02 PM
  Subject: Re: [Wbo2] simple warning LED display


  Consider using a comparator circuit, something like an LM319 would be OK. 
    ----- Original Message ----- 
    From: Tommy 
    To: wbo2 at diy-efi.org 
    Sent: Sunday, September 18, 2005 3:29 PM
    Subject: [Wbo2] simple warning LED display


    I?ve been on a search to find a very simple LED display for a wideband unit.  What I want is a simple 1 led warning light that will trigger when I get a lean voltage.  I don?t want to monitor the range all the time.   I just want a single led to come on with a AFR of 15 or greater.  A light that when at WOT, I?ll know something is wrong without having the interior of the car look like a disco club.  If anyone has any ideas, links, past projects, etc I would be very appreciative.

     

    Thanks

    Tommy



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