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Topic: Sound card output (Read 673 times) previous topic - next topic


I was wondering if the output from a sound card had any negative voltage or is it only positive. Googled it but the results were not that clear.


I googled your question, but it was not clear also....


Output of the sound cards is essentially  AC voltage, meaning Negative and Positive. http://en.wikipedia.org/wiki/AC_voltage
To interface signal to arduino's analog input, you'd need 2 resistors and a cap:

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