Problems with USB Port on Homemade speaker box, why can't I listen to music and charge at the same time? Answered
Okay, so I have a speaker box that I made myself with a kitted 7w audio amp. I put that in a box with a decent 4 inch speaker, and that was working great. Then I decided that I really need to add some sound reactive lights, so I got a TIP31 transistor and hooked that up along with a 7805 5v regulator to a USB port so I can charge my devices with it.
So, the USB port works great, and so does the speakers and lights. But *not* when I plug in my device to charge while it playing music through the 3.5mm audio jack. It gives off this weird fuzzy sound, but still charges.
On my multi meter it shows continuity between the USB port and the audio input and speaker, so I first thought that maybe I didn't have something grounded quite right, but it all appears to be set up right.
Is there some sort of filter I can set up so that I can charge one device and play music at the same time on the same device?
Or wouldneed to set up the two circuits on different power sources? I would really rather not do that for the simple fact of trying to keep it simple...
Here's my schematic of it (sorry about it being sloppy, I did it rather quickly but everything on there should be right).
Here's a better quality picture of the schematic