Simply throwing a chain through the cassette would lead to tape reeling out everywhere. Thus, I fired up some CAD software and engineered a solution to do the job! Here’s how I built an adapter ...

The FM transmitter, also called an "FM modulator," transmits the audio as an FM radio signal that is picked up by the car's antenna, while the cassette adapter uses a modified tape cassette.

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 ...