REVOX B226 chip upgrade with back track and auto power off

Mods for the Revox B226 CD player.

New functions:

- The goal of the INDEX key can be switched between the original function and the back track function!!!

- The CD player switch off automaticaly after 5 min or 30 min in stop (of course on the video the time is shorter!!!)

NO OUTSIDE MODS!!!! The Revox stay as original!!!!

You need about 1h30 to do this upgrade. (1 uC, 7 wires and 2 passives components
uC available!