I use Arduino Pin to make PWM and give input to Op Amp LM324.
I would like to know, why my op amp has difference output. I have gain 2x. I multiply input from 0-5 Volt to 0-10 Volt because the gain is 2x. Output Pin 1,7, 14 is okay (has similar voltage).
But in output pin 8. It has different voltage almost 1 Volt. Let say Max Output for Pin 1,7,14 is 10.00. Then, pin 8 has around 9.1 Voltage.
How could be like that? I try to change my IC with new one. And has some problem. Why does it go?
My circuit is okay also. I double check my circuit.
Edit (Attach circuit)
RG = RF = 100 kOhm
Vin = 0-5 Volt
Vout = 0-10 Volt
I ground all of in one point. Also with Ground of Arduino. All of other 3 op-am is typically same circuit as above.