Bluetooth Audio Adapter: Besign BE-RCA could turn your wired ... Wide compatibility: Use it with any powered PC speakers, home stereo systems and A/V Receivers via RCA or 3.5mm Aux jacks.

The hack is straightforward, with [Jim] grabbing a Bluetooth-to-cassette adapter off the shelf. These simply take in audio over Bluetooth, and pipe the analog audio out to a magnetic head ...