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Topic: Sound card output (Read 456 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.

cjdelphi

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



Magician

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:
http://coolarduino.wordpress.com/2012/06/22/audio-input-to-arduino/

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