I would like to connect the DAC outputs of my arduino board to my pc sound card input so that I can use my sounds card as an osciloscope.
I have two questions:
1- if I don't use an amplifier, how can I protect the arduino from being damaged?
2- if I use an amplifier with dual rails, do i still need to protect the arduino somehow?
Please note that I know little about analog circuitry so a direct solution would be most appreciated. In short how would I use components to make sure I don't end up nuking my dac outputs.