Thanks, yes, actually is because I started to work on a lab in the university that provides the components for the projects of the students, and my professor wanted to make a circuit like this to see if the component that the student give back is actually working.
I generate a 60hz pwm with arduino, as the quadratic wave is a sum of all odd harmonics, I used a band pass filter for 60Hz to generate a sine wave, I tried to make a Wien bridge oscillator but failed, so the out of the filter I passed through a class AB amplifier, as the current was low.
Now I'm focusing on get the current and the voltage through the component under test, I used the analog pins of the arduino to get the voltage through the 100ohms resistor to measure the voltage and through the 1ohm resistor to know the current, so I plotted the graph and I got the analog signature of the LED.
So far I got the LED, diode, and capacitor shorted, and a led ruined right.
But my doubt actually was on the use of the osciloscope, as I started to use him this week, I didnt know what I was doing wrong in the circuit, as I mentioned I was getting a full sine wave but Towz helped me with that.
But yet the problem is even if I measure the from the cathod I'll be getting nothing, and I couldn't understand that.