WBO2 LCD digital display

[Robert W. Hughes]

> I have one similar to it @ work, the voltage problem can be overcome simple
> enough with an opamp, the issue is the non linearity of the WBO2 output in
> relation to the AFR.  I don't know of a way to straighten out the curve with
> an opamp.
> 
> BW
> 
> - -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Enzo Iadevaia
> Sent: Sunday, October 21, 2001 4:29 PM
> To: diy_efi at diy-efi.org
> Subject: Re: WBO2 LCD digital display
> 
> 
> I just realized i don't think this panel meter can handle the voltage
> input... SHIT...
> 
To just read the voltage so you could look up AFR in a table, you could
use any digital voltmeter with a 10v setting. To use this particular
meter you would connect a 990K resistor from the WBO2 output to the
meter input and a 10K resistor from the meter input to ground. This
forms a voltage divider giving a 19.99v full scale

An unanswered question is the power source for the meter. Many of the
cheap panel meters like this require a power supply isolated from the
measured voltage so you would have to use a separate battery rather than
the vehicle power.

-- 
Robert W. Hughes (Bob)
BackYard Engineering
29:40.237N, 95:28.726W or perhaps 30:55.265N, 95:20.590W
Houston, Texas "The city with too much Oxygen"
rwhughe at ev1.net
----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org