A simple circuit, UNO and MP3 module and a horn, power supply to normal play music with a computer, but with two pieces of 3 v button battery voice became the intermittent beeps, strives for the great god help me to solve this problem, don't know how to make an independent power supply,

CodePudding user response:

Button battery current is very small, you are in the lithium battery

CodePudding user response:

Should be the battery capacity is insufficient, in section 3 series dry cell to see,

CodePudding user response:

Battery is small, for lithium battery with booster module into 5 v to express