Faced with an old console stereo from the 1960s that was barely functional, [Sherman Banks] aka W4ATL decided to upgrade its guts while keeping its appearance as close to the original as possible.

The cassette deck in question, a Yamaha K-220, was old enough to lack a remote ... This made it easy to interface an ATmega328P to the stereo’s original circuitry. Digital IO pins are hooked ...

The little music receiver connects to a stereo receiver or amplifier (via ... Admittedly, there are a lot of Bluetooth music ...