Rg/Ω = 258
In/mV Out/V
-----------------------
0 1.76
1 1.93
2 2.13
3 2.31
4 2.48
5 2.70
6 2.90
7 3.09
8 3.25
9 3.44
10 3.65
11 3.83
12 4.02
13 4.22
14 4.42
15 4.58
+5V
|
/
\
/
\<--------------> to pin 3
/
\
/
|
0V
I did that already and it didn't work. Can it be a problem with the PCB design?
Note:
Input is in the range 0 <-> 15 mV
Lakmal
You previously reported +/- 0.2 V, by the way....I assembled the circuit on a bred board and now the output swinging has been reduced [from ±100 to ±20, but not eliminated].
The latest results are with a breadboard or PCB? What did you connect at the input? Did you try a simple input short? Did you verify the Rg resistance value, if it's represented by variable resistor.I think it must be a problem with the PCB design
I only count a difference of one, the missing ground connection of negative input.It is not like the one shown on post #5. Do you follow a new schematic? For example, there are 5 nodes (pins or terminals) connected to ground on your first circuit. On your PCB there are only 3.
I only count a difference of one, the missing ground connection of negative input.
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