DIY Bluetooth board v2 update for those that care.

So it works! I ran into some issues I'll explain below.

The goal with this board is to make an all in one modular Bluetooth receiver for audio applications.

It has the ability to be a receiver for a bigger system or be a portable unit that's powered by a lithium ion battery.

This was the first mistake. Trusting someone else's package when I was too lazy to make my own. One side of the module would line up but the other side would be off. To address this for testing purposes I soldered the one side with the most connections and used thin wire to run the other side.

First test after everything is stuffed.

This thing has the ability to charge and discharge a lithium ion battery as well as provide the proper voltages for the amp and module.

After the battery was charged I turned the board on which throws the battery supply to a switch mode 5 volt regulator and a linear 3.3 regulator.

It worked for about 5 seconds then a few things smoked. The audio amp blew, the 3.3 reg blew and the module was toast.

And this is why. This wire isn't suppose to be here and this was later incorporated into the board.

This rogue wire grounds the feedback for the switch mode regulator which caused the 5 volt regulator to short and blew a few things on its way out.

That's what it should look like.

The weird part is that in my eagle 7 files the wire is right but when I switched to 9 this happened. No idea why.

This was the solution. I had to cut the feedback in pin free and route the connections as they should be.

And it works! Checking out the audio signals.

This cap also has to be added in the next board.

Hope you enjoyed maybe! If not here's the cat I feed.