Start: 11:30

Board Design Improvements:

• Add a switch for turning the board on/off
• Move input leads so that the mounting hole doesn’t intersect with one of them.  I don’t think this is the cause of the issue as the one that works well has this same issue.

Potential solutions to the feedback issue:

• Send the input signals negative lead to group instead of to the negative on the pre-amp
• Possible need for another voltage regulator on 12 volt side.
• Need to rebuild board on a breadboard to experiment with possible solutions.
• Check current on 5 volt branch to make sure its not going over 1 amp.
• Isolate out pre-amp to see if the problem is with that circuitry.

End : 3:15