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OP amp problem

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nesse

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Hi all
I have a sensor that outputs 2.5V to 4V and is trying to convert that into 0-5V. I'm using one inverting OP amp with it's non-inverting input to a voltage divider to set the 2.5V ref. and this works, outputing 5-0V. But I can't figure out how to follow that with another inverting OP to get 0-5V...
Any suggestions?
 
Similar to what you already did. Add another inverting op amp with a gain of 1 and the non-inverting output connected to the same 2.5V ref.
 
Hi Nesse,

Try this one.

on1aag.
 

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Thanks On1aag, that's a very clever idea :)
I only have 5V available, so first I didn't think I should try along that line, but I can get a MAX871 inverter in a sot-23, so it will work perfectly, thanks :)
 
The MAX871 is a voltage power inverter. How are you planning on using it? Are you trying to output minus 5V? I though you were trying to output 0 to plus 5V.
 
Hi all
I have a sensor that outputs 2.5V to 4V and is trying to convert that into 0-5V.

So the output goes into a 2.5v level shifter (a zener and resistor) and then into a gain block with gain = 5/(4-2.5) = 3.3. (a transistor and a few resistors).

How accurate do these levels need to be?
 
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