You can get an adapter at Radio Shack.
Outboard DAC's such as the Headroom Micro DAC will accept an optical S/PDIF digital input.
Link is: http://www.headphone.com/products/headphone-amps/the-micro-line/headroom-micro-dac.php
Outboard DAC's such as the Headroom Micro DAC will accept an optical S/PDIF digital input.
Link is: http://www.headphone.com/products/headphone-amps/the-micro-line/headroom-micro-dac.php