I'm using a Raspberry Pi 2 and an AD/DA Board, with no extra circuit. Reading on the internet though, I found that DACs need a low pass filter in their output, and I don't understand if the behaviour of my DAC is normal, and I wonder if I need the low pass filter. Its output goes down to 0V at every sample, is it normal? Is this the reason why low pass filters are used?
Thanks in advance,
I tried with a better oscilloscope to analyze the signal, and it's all fine. I'm so sorry if I created a useless thread, but I still have learnt new terms I didn't know before.