I'm trying to build the circuit shown in figure 7 of the article, but I have a few questions.
1. Should the LM356 be driven with a 5.0V supply, or 3.3V.
2. How should the -Rg (pin 1), +Rg (pin
![Cool 8)](./images/smilies/gear_cool2.gif)
3. Are the +Vs (pin 7) and -Vs (pin 4) on the AD623 hooked up? From the datasheet it looks they supply power. If so, did you use 0 and 3.3V, or 5V.
Thanks in advance.
Update: 2/11/2016
I overlooked a paragraph in the article. It turns out both the Lm356 and AD623 should be powered off 5V.
Across the -Rg and +Rg pins on the AD623, use an 11k resistor to achieve a gain of 10. (Rg = 100k / (G - 1)).
I hooked the Ref pin on the AD623 to ground.
+Vs and -Vs on the AD623 are power. Hook up to 5V.
The two sensitive voltages (for the TMP36 and -IN on the AD623) were driven by the 3.3 reference voltage.