Chris:
If memory serves (always a dicey proposition when you get to be
my age) an analog gauge by itself is not suitable for an O2 sensor. The
reason is that that the internal impedance of an O2 sensor is extremely
high (10s of megohms?) so that the sensor will not provide enough
current to make an analog voltmeter register.
You need to buffer the signal with a very high impedance input
if you were to attempt to use an analog gauge. This is simple to do with
a FET input op amp, but by itself an O2 sensor will not register on an
analog voltmeter. Modern digital meters have FET inputs as a matter of
course, so they can register the voltage no sweat (typical input
impedance, 1 million megohms).
So I suppose you could build a little buffer amp, and then hook
it up to the voltmeter...
Cheers,
Vance
------------------------------
Cogito Ergo Zoom
(I think, therefore I go fast)
TR6 Web page: http://home.comcast.net/~v.navarrette/
-----Original Message-----
From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net] On
Behalf Of Chris Foster
Sent: March 02, 2005 7:02 AM
To: Adam C Beasley; 6pack
Subject: RE: Air Fuel Monitor
Along these lines...
I've always wondered if there is a way to create an analog gauge for an
air fuel monitor - perhaps by refacing a temperature gage and scaling
the voltage into it? Just a thought, was curious if anyone else had
explored it? The end goal would be to have a matching gauge to mount in
the dash for that "original" look and feel.
thx...
c.
'76 TR6 - CF53954U
'76 Spitfire - FM47622U
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