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.


  • For audio they generally AC-couple the output. i.e. put a capacitor in series with the DAC output. – Gerben Jan 30 '16 at 13:37
  • Does any capacitor do? or should I look for specifics? I know the DAC output will not go over 3.7 volts, in fact it barely reaches that number. – Aaron Azhari Jan 30 '16 at 13:43
  • That not really my area of expertise. Maybe this question will help. – Gerben Jan 30 '16 at 13:46

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