The electronics from the cassette adapter are simply placed ... Alternatively, you can hack Bluetooth in to just about any classic stereo; we’ve got a guide on how to do just that.

A BLUETOOTH RADIO IN 0.18 UM CMOS. The Bluetooth standard is now recognized as a standard for short-range data and voice transfer. Presentations at the ISSCC 2001 [1] and ISSCC 2002 [2], showed a ...