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how do i make a portable speaker get power from a 9v battery instead of my mp3 player?

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st0rm8 years ago
mattyuke8 years ago
lemonie8 years ago
You'd need a stereo audio amplifier. This is a good one:
https://www.instructables.com/id/Headphone_Amp_Chu_Moy/

L
Exactly like I was going to say. However, it should be noted that this will only save you a little bit of battery power on your mp3 player(which i assume you're trying to do). The way to do this is turn the volume down low on your mp3 player and turn up the volume on your amp.
I think that the speaker is a heavy-load on the mp3 player and it keeps running out of charge, or the volume isn't loud enough. Unless the amp is taking a lot of current (which it shouldn't) the volume level isn't going to make a lot of difference to mp3 battery life, but I agree with your advice.

L