These adapters were basically the write heads of tape players in a plastic cassette chassis.
The heads in the cassette were in the place were in a real cassette the tape would be read.
So the heads in the cassette were directly against the read heads in the car cassette player.
You would do the signal to tape and tape to signal without the tape, skipping that and reading and writing at the sane time.
You would think that passing the analogue signal back and forth so many times would make for a lot of noise and poor sound quality, bit it worked surprisingly well and not much worse than directly wiring the out port of your device to the input of the car stereo.
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