Take something like the free the Square magstripe-to-audio converter, record a swipe. Clean it up and/or amplify it, connect the Square reader as headphone outp

Take something like the free the Square magstripe-to-audio converter, record a swipe. Clean it up and/or amplify it, connect the Square reader as headphone output, and blast the recording as loud as necessary to induce the read in a nearby swipe reader. Security-wise, "the magnetic field will generally fall off as the cube of the distance from the magnet". http://www.instructables.com/id/Read-any-magnetic-strip-card-with-a-Square-reader-/ http://www.instructables.com/id/Read-any-magnetic-strip-card... http://van.physics.illinois.edu/qa/listing.php?id=419 http://van.physics.illinois.edu/qa/listing.php?id=419