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Using Nokia BH-503 to make a bluetooth speaker.


Oct 4, 2015
Oct 4, 2015
Hey there guys! I am new to this website. I need some help to turn the Nokia BH-503 bluetooth headphones into a music adapter for a portable speaker.

The plan is to use the headphone PCB to receive audio from my phone over bluetooth. Then feed the output of the headphone PCB to a amplifier. I'll be using the PAM8403 which is available on ebay.
Here is a picture of the PAM8403 amp-

I have a speaker driver from my old computer speakers which is rated at 1.5W. Considering that the amp is rated for 3W per channel the driver should do fine if I don't set the gain too high.

This is what the PCB of the headphone looks like:

As you can see the headphone PCB has stereo output which I will connect to the left and right inputs of the amp. Assuming that its fine to do that. Correct me if this is not the right way to do it.

The amp has stereo output. But, I want mono output because I will be using a single speaker.

So, my question is whether there is a way to get mono output from a single channel?

Any help is appreciated :)