I'm currently building a portable stereo speaker and have run into some issues. The speaker is based on a set of broken Jabra Move headphones (used as bluetooth receiver) and a XH-A232 amplifier board.
The way I'm planning to make this work is to use the speaker outputs from the headphones (left/right positive and negative) and try to feed these into the amplifier board. The problem is that the amplifier uses positive/negative/common as input (3.5mm/TRS style), which does not match the output from the headphones.
So far I've tried two methods, of which none have given a satisfactory result:
I soldered the two negatives together and fed them to the common/ground of the amplifier. This worked, but the the two speakers played in mono. Somehow it seems like the left and right channels is mixed together by doing this.
I soldered only the right negative to the ground terminal of the amplifier board. This also worked, but a similar behavior was obtained. The sound signal coming from the right channel is played equally loud on both speakers. The left sound signal plays only on the left speaker, but VERY silently.
Now I'm out of ideas, and I need some advice from all of you. What can I do to make the speaker play stereo sound?
Thanks in advance!