I would suggest an external usb soundcard. Go through ebay and find the kind in the blue metal case. You can actually pull the card if you want physical access. I have used that model, which uses Cmedia chipset, with the line input.
Even with protection circuitry, I would be concerned about blowing up the PCs soundcard. Better to blow up an external card. I'd call that an outage! ------Original Message------ From: Hal Murray Sender: [email protected] To: [email protected] ReplyTo: Discussion of precise time and frequency measurement Subject: [time-nuts] Power glitch, Menlo Park CA, 4 seconds Sent: Aug 7, 2012 3:09 PM I'm finally starting to capture audio data so I can see what happens when a cycle gets lost or added. We lost power for a few seconds yesterday. Here are a few graphs: http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-06-a0.png http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-06-a1.png http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-06-a2.png (The vertical scale is 16 bit audio rather than volts.) I'm seeing glitches like this: http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-07-a0.png http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-07-a1.png http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-07-a2.png The PPS side just keeps ticking along cleanly. I'm guessing ground problems, in part because I'm using the mic input because I can't get the audio mux to switch to line-in. Any Linux audio wizards here? If so, please contact me off-list. -- These are my opinions. I hate spam. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
