1 How to Add a Line-In and Bluetooth to old Stereo Systems (1)
Recommended as the opening part of a three-part series that helped people with their own hardware projects, though comments do not spell out the details.
Channel
The Post Apocalyptic Inventor
2 recommended videos. Channel on YouTube
2 Car Stereo Teardown, Analysis and Hack - Blaupunkt Car 300
Cited as a worked example of modifying a car cassette stereo, with people pointing to it for wiring ideas and board changes near the audio input stage.
