Picture of BT2BT (Bluetooth 2 Beetle)
I wanted to add an audio input to my antique volkswagen's Autoradio, but a simple audio câble was not  smart enough. So I decided to add some bluetooth to it.
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Step 1: Get the stuff

Picture of Get the stuff

Ok, what we need now is a cheap AD2P bluetooth headset, you can buy one on ebay for exemple. You'll need an enclosure for your project too, I tought it was cool to use a vintage tape as my enclosure.

Step 2: Taking appart the headset

Picture of Taking appart the headset

Take appart the headset carefully because all the tiny wires are very fragile.
Then cut the headphones wires. 

Step 3: Put evrything in the case

Picture of Put evrything in the case
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All the electronics will fit in the case with some dremel improvement. The board is Hot-glued. Ive drilled a small hole for the microphone. 

Step 4: Adapt th impedence

Picture of Adapt th impedence
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My Autoradio is a Blaupunkt Wolfburg III and was built in 1969 ! It hopefully has a tape input, all I have to do was to transform the stereo signal to a mono one, and adapt the impedence to avoid the signal saturation.

The resistors are 180Ohms.

Step 5: Close the case

Picture of Close the case
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When done, you can close the case. (I used 1mm connectors to easily unplug my adaptater).

I've glued the controls buttons on the head of the tape case. (as shown).

Step 6: Pair it with your device

Picture of Pair it with your device
Plug the BT2BT to the autoradio, In my case, I've drilled a small hole int my glove box to pass the wires thru.
Now you have to pair it with your bluetooth device, and start playing some music.

Step 7: Enjoy !

Picture of Enjoy !

Enjoy a cool ride in your old car, with cool music and no wires !
andrewbaker3 years ago
Wouldn't it be easier to use a tape to 3.5 mm converter and plug that into a 3.5 mm to bluetooth converter?
I like the Bluetooth cassette tape but you could easily do one better and not have to modify the player people have been using those cheep cassette's that can connect to CD, mp3 computers for years taking the output from the blue tooth and wiring it to the magnetic head and you will have a completely wireless solution and heck with the size of motors these days it could be powered by the tape players own rotating spindle. while typing this they already make one for under $30 it don't get its power from the player but it does the rest. Bluetooth Cassette
dahzz (author)  Cyberscann543 years ago
Hi ! The bluetooth cassette is quite nice, but as my autoradio was manufactured in 1969, it does not have a built-in cassette player. That is why I'm using the rear 5 pin port.

I've used a cassette case just as an enclosure, this is a "clin d'oeil" (blinking eye) to the great 80's music.