For my personal development homework I chose to make an old wired speaker into a bluetooth speaker.
I used a big old Sony speaker and a small amplifier from an Intempo bluetooth speaker.
I used masking tape and securely stuck the amplifier to the back of the speaker. The I used a special audio wire to connect the amplifier to the speaker.
Then I stuck the label to the back of the speaker.
Then I found a 5 volt power cable and plugged it into the amplifier and tested if it worked.
Then I connected a laptop via bluetooth to the amplifier and played some music and it