Testing the VMM
Problem: In this video, I am showing a near end product that required troubleshooting due to not receiving much audio change. I placed an oscilloscope lead on test point 3 (TP3) to see if I was receiving any audio into the PAM8403 audio amplifier, which I was not. ​​​​​​​​
Solution: The main issue I discovered after the video was from where I placed the jumper wire connectors across the headers. I mistakenly had printed my original potentiometer board without net connections across the header pins, which would have enabled the jumpers to be placed on either end. Because of this overlook, I had placed my jumpers in columns 10-2 instead of columns 9-1. However by simply shifting the jumpers to columns 9-1, I had received the audio I was looking for.
What I did vs. What I should have done
Other changes I implemented include soldering the jumpers directly to the potentiometers for a better connection, re-soldering any pins that looked not so good, and placing heat sinks around open wires that could have caused shorts.