Playing sound through a speaker, but powering with an external source

I was planning on using a TDA2030A module to amplify, but I wanted to use the full 6V for it. Would I be able to do that with what you suggested?

Sure, you could have a 4.5V tap (3 cells) and a 6V tap (4 cells). The negative terminal would be common to ground on all devices.

Alright, I'll look into it then. Thanks for your help!

You're welcome.

Possible but not good practice with batteries. The first three will run out (much) faster than the fourth one, as they have to deliver more energy.

In any case when replacing batteries, they should all be replaced at the same time with a same type.

Another solution may be to use 4x NiMH AA batteries. They have a lower nominal voltage, but fully charged they may also reach 1.5V per cell (while fresh AA alkaline cells are at 1.65V).

In this particular application, the 6V power amplifier module will have the highest energy usage. Regardless, OP can prototype their system and when it works, they can make a decision about how to go forward.

@itsfoxy87
I don't know if it's an option for you or not but there appears to be a DFPlayer Pro that has a 3W amplifier built in. The part number is DFR0768.

I think you said you had an external power amp so you may want to continue using that.

The built in 3W amp is what mine has. I was able to power the speaker just fine though, but I'll look into the new amp for the future^^

In that case you could invest in a 3 cell battery holder and consider upgrading to C or D cells since it doesn't sound like you need the 6V for anything.

I was going to use the 6V because

In my case, I'm already using 4 AA rechargeable Ni-MH batteries, so if it's okay I'd like to hear more about your solution.

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