I am fairly new to electronics and working with arduino and I have a question that probably has more to do with general electronics rather than with arduino.
I am trying to amplify the pwm signal from arduino using lm 324 op amp in non inverting gain regime using two resistors of 10kOhm. I supply 15 volts single rail to the op amp using the power supply I could salvage. When I connect power to pins 4 and 11, I can measure about 12 volts on the output of each op amp that is in the package ( there are 4 in the package I am using). Also when I have my voltage divider at inverting terminal and have the noninverting gain of 2 my output is still always 12 volts doesnt matter what I input from arduino.
I know it's a silly question but I couldn't find anything that could help me to overcome it online.
Any help is appreciated.