Greetings...
I'm working on a project of putting an mp3 player into a TI-84 calculator. The player itself is a cheap pcb a size of a coin which plays mp3 files stored on an microSD card. The sound output from the player is amplified by an LM386N 8 pin audio amplifier and is played on an 18 OHM 0.2 W speaker. The whole thing is powered by 4 AAA batteries of the calculator. Under 6V the amplifier and the speaker drain 125 mA. the player drains about 25 mA.
However my problem is that when I connect them both to the battery pack they only drain about 75 mA instead of 150 mA and you can barely hear any music. Am I missing something? Why does the circuit all of a sudden starts draining half its normal current? I would greatly appreciate any help.
I'm working on a project of putting an mp3 player into a TI-84 calculator. The player itself is a cheap pcb a size of a coin which plays mp3 files stored on an microSD card. The sound output from the player is amplified by an LM386N 8 pin audio amplifier and is played on an 18 OHM 0.2 W speaker. The whole thing is powered by 4 AAA batteries of the calculator. Under 6V the amplifier and the speaker drain 125 mA. the player drains about 25 mA.
However my problem is that when I connect them both to the battery pack they only drain about 75 mA instead of 150 mA and you can barely hear any music. Am I missing something? Why does the circuit all of a sudden starts draining half its normal current? I would greatly appreciate any help.