Homemade Bluetooth speaker

[brainfarth]

I picked up 5 - 8 ohm speakers from a garage sale yesterday and came up with an idea.. It's taken me many hours, but I managed to throw together a bluetooth speaker. I had a DIY 2x15 watt amp kit ( http://goo.gl/KMAL1Z ) that was put on the back burner, a bluetooth receiver and a pile of Elite 1500 NIMH batteries(from a project that never took off). I put the kit together and realized there was enough room on the board to put a 7805 voltage regulator circuit for the bluetooth. No fancy etching here. I used a dremel and carbide to section the area off. Then I soldered the batteries (video of me soldering them: https://goo.gl/OuQ8vh ) together (12 cells to power the amp, of which 8 power the regulator), placed everything in the box and made all the connections. The original speaker-in is an output for the right speaker. The thing is flippin' loud! But I am curious about one thing. The smart battery charger ( http://goo.gl/QZPavz ) has a temp probe that is supposed to be stuck to whatever battery you are charging. With a setup like I have, is it necessary to install it?




On another note, why dont all of my pictures always load for inline preview?

 

[beast775]

Nice diy bluetooth stereo,been thinking lately that i need a self powered 18650x2 small subwoofer spkr setup for my ebike.off to look at your vids.

 

[amberwolf]

On another note, why dont all of my pictures always load for inline preview?

Have you looked at the thread about Adding Pictures in the Forum Rules and Features section?

 

[brainfarth]

I've run into an odd problem. I have to leave the Bluetooth receiver on because its inside the speaker box. It shares the same ground as the amp, so I can cut power to each, even though they draw two different voltages from the same battery pack. It has its own battery and will eventually die with the power cut. But when I fire the system up, it refuses to turn on all the way , so I have to open up the speaker (temporarily duck taped at the moment) and on to establish the Bluetooth link. So I guess I have to put an additional switch on the speaker, but I don't know how I'm going to tie into the old one because of the size. How do you go about soldering to such a tiny board?