The [Wikipedia Article](https://en.wikipedia.org/wiki/Cassette_tape_adapter#Usage) explains that it works like an mp3 adapter but it doesn’t really explain how those work. I can’t wrap my head around how it converts mp3 or bluetooth signal to a physical signal fast enough to listen to music comfortably, let alone hold a phone-call through the adapter.
In: 15
Cassette players work by having a little magnetic head read the magnetic recording on the tape as the tape slides past. The magnetic head could also be used to *record* a magnetic signal onto the tape. A lot like how hard disk drives work, but analog. This recording aspect will be important in a moment.
The Bluetooth cassette adapter contains a Bluetooth receiver, a digital-to-analog converter, and a magnetic head of its own.
The adapter receives the Bluetooth signal from your phone, converts it into an analog sound signal, and passes that signal into its magnetic head as if it was recording to a tape. The cassette *player*’s head is able to read this signal just like as if it was reading an actual tape.
It’s kinda like how in the old Adam West Batman TV series, you would sometimes see Commissioner Gordon patching the Bat-phone into a regular phone line by holding the two phone receivers up against each other.
Since everything that’s happening is happening electronically, it’s basically instant.
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