Modifying O2 output

[DAVE MORRILL HPL DESIGN ENG 207-775-8574]

Hello,
	Someone suggested a 1 Meg potentiometer, I agree.  You may want to add 
an op-amp (lm324) in a voltage follower configuration before and after the pot 
to buffer it.  Keep it simple and try the just the pot without the op-amp first.

	A tip to keep the pot from moving from vibration etc. once you have it
set where you want it is to put a dab of paint or nail polish where the shaft 
meets the body of the pot.

Best,
	Dave.



From:	GPO::"owner-diy_efi-outgoing at coulomb.eng.ohio-state.edu" 27-SEP-1995 11:23:57.43
To:	DIY_EFI at coulomb.eng.ohio-state.edu
CC:	
Subj:	Modifing O2 output

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