Take apart an old boombox and turn it into a DIY Cassette Walkman with modern enhancements, but in a Retro style.
Possible Hacks/Topics:
Belt Drive to Direct Drive conversion
Motor Speed Control via Feedback loop
3D Printed Parts
Electronic Soft Touch Controls
Auto-Reverse mechanism
Arduino
Analog Signal Processing
Wireless Headphones
Tapes primarily, but an Arduino or Raspi could give it additional versatility to play MP3s as well.
I would think it would make an interesting video to show how old analog tape technology works,
and if there are still hacks/improvements to be made on its design.
Then again, it's a fun reflection on how incredible the Walkman was and how it used to be as commonplace the iPod.
