Need help with non-linear(?) Op-Amp circuit

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Jack_K

Joined May 13, 2009
143
That last circuit won't work because the op-amp can't drive negative when only powered by +13.8 volts.

So, here's my latest attempt. Isn't there ANYBODY who is willing to analyze it tell me if it will work?

I was finally able to measure the voltage across the motorcycle's gas gauge sending unit.
Ohms Volts
10 --- 5.85
20 --- 6.23
40 --- 7.00
70 --- 7.99
100 -- 8.80
150 -- 9.83
175 -- 10.25
200 -- 10.65
215 -- 10.85

The gauge I want to add produced the following voltages:
Ohms Volts
10 --- 0.40
20 --- 1.33
30 --- 1.92
40 --- 2.52
50 --- 2.94
60 --- 3.24
70 --- 3.50

Here's the circuit to convert the higher voltages to the lower ones.

Jack
 

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