I made this conversion for my Blaupunkt Manheim Radio (but it may work for others) using 3D printed parts I designed and a Bluetooth Amplifier PCB.

Do not attempt this if you are not good with electronics or don’t want to damage your radio. I take no responsibility for any damage you cause, Ensure you use the correct gauge wires and add an external fuse.

I used this Bluetooth Amplifier PCB https://amzn.to/444DJby but any similar one should work, be sure to check reviews as the first version I bought wasn’t as good quality as this one.

The STLs are available here for free https://www.printables.com/model/1319195-classic-blaupunkt-radio-conversion these are NOT FOR COMMERCIAL USE.

To convert the radio is pretty simple:

1. Strip the radio, removing the old PCB and controls. leave the buttons and display in place.
2. Move the Volume pot into the Tuning pot position.
3. Mount the PCB Bracket using the original Tuner collar and nut.
4. Heat the end of the shaft adapter for a few seconds and push onto the shaft of the new volume pot, when cool thread the shaft through the hole.
5. Screw PCB into the adapter.
6. Finally wire up the new PCB, I didn’t use the supplied cable, I soldered 12v and Gnd feeds to the PCB.
7. Ensure you fuse it externally, I cannot stress this enough.
   

You can wire the original bulb up to the 12v feed or replace it with some LED strip as I did, be sure to only give the radio a switched 12v supply and don’t leave unattended when in use.

I am really pleased with mine and have used it for thousands of miles now, I would thoroughly recommend good quality speakers (I used these JBLs in kick panels https://amzn.to/4ksJANA ) as this makes a world of difference, I also fitted an sub under the rear seat (this one https://amzn.to/3T97d1B ) wired into the speaker outputs, I recommend taking a feed from the coil to the remote power input as the auto detect power isn’t great.