Modifying O2 output

[Zublin, Bryan (SD-MS)]

It depends on the output impedance of the O2 sensor.  Try a 100K ohm load.
If the voltage drops significantly, then I would go with an op amp with a
high impedance input.  Personally, I would use the op amp always; this also
allows you to easily add some lowpass filtering.

Bryan Zublin
bzublin at gi.com
 ----------
| From: owner-diy_efi-outgoing
| To: DIY_EFI
| Subject: Modifying O2 output
| Date: Wednesday, September 27, 1995 10:32AM
|
| Howdy all;
|
| I need to modify the output of my O2 sensor (specifically I need to drop
the
|
| voltage my computer sees from the sensor).
|
| I know what you are thinking, don't ask.  This is hopefully only a
temporary
|
| fix.  I will describe the whole system when it is working correctly.
|
| Anyway what would the wisdom of the net suggest:
|
| 1) An op amp set up to do the division.
|
|             or
|
| 2) Just a voltage divide made up of resistors.
|
| If (2) what should I limit the current through the divider to.
|
| Thanks for the info.
|
| Rob
| gallant at oasys.dt.navy.mil
|

                                       John S Gwynne
                                          Gwynne.1 at osu.edu
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