I just finished my first CMOY using this guide. The only modification that I made was that I used 2 batteries and LME49720HA opamp.
Q1. What will happen when batteries will run low? Would the amp just stop playing?
Q2. The amp is a bit too loud for my liking. How can I lower the gain? I guess I need to change some resistors.
Q2.1 What gain setting does this amp have by default? 3X, 4X, 5X?
Q3. How can I make it run out of power supply? Do I just connect AC/DC 9-10V adapter instead of batteries? If so, how many amps this power supply needs to have?