Electronics Question - batteries

randomshenans

randomshenans

randomshenans

Soldato
Joined
11 Sep 2009
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France, Alsace
I recently just completed a mini build of turning an old champagne box into a bluetooth powered speaker. I'm fairly useless at electronics, but this was really simple and it sounds really good to be fair.

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It simply uses tweeter - bass driver - crossover - bluetooth amp board - micro USB connection out the back.

You plug in the micro USB and power comes on. I would like to take this the step further and have a pack of rechargeable batteries in the speaker, an off off switch and the micro USB would be used to charge the batteries.

Was looking at replacing my little micro USB board with this one:

617hE73YZ-L._AC_SL1500_.jpg

Then having the output going to the bluetooth board, but with a switch wired into that + and would like a battery pack running off this but I don't know what to use for it? I want it to last a bit of time between charges, but unsure what sort of battery I should use?
I see these AA battery holders with 2-6 batteries in there but how long would it last?

If it helps the bluetooth amp is this one:

https://www.amazon.co.uk/TPA3116-Di...amp+board&qid=1591617290&s=electronics&sr=1-5

I know there are some great electronic tinkerers on here so thought I'd ask!

Fanks!
 
Couldnt you take the simple path of using a USB power bank with reasonable mA/h storage? They are dirt cheap, come in many different shapes and sizes, charge via USB and you can carry on using the onboard USB port on the amp board. You need to measure how much current it will draw, its probably on the data sheet which came with the amp board then you can work out how many hours you want it to last and size the pack accordingly
 
Bear said:
Couldnt you take the simple path of using a USB power bank with reasonable mA/h storage? They are dirt cheap, come in many different shapes and sizes, charge via USB and you can carry on using the onboard USB port on the amp board. You need to measure how much current it will draw, its probably on the data sheet which came with the amp board then you can work out how many hours you want it to last and size the pack accordingly
Click to expand...
I was just going to suggest that, i bought a ravpower 20ah for not much recently. That should last a fair amount of time.
 
Bear said:
Couldnt you take the simple path of using a USB power bank with reasonable mA/h storage? They are dirt cheap, come in many different shapes and sizes, charge via USB and you can carry on using the onboard USB port on the amp board. You need to measure how much current it will draw, its probably on the data sheet which came with the amp board then you can work out how many hours you want it to last and size the pack accordingly
Click to expand...

Seems like the easiest option to me. Especially when they are basically the same thing you're trying to achieve internally:


Really cool project btw!
 
I'm struggling to parse how big that speaker is. Are we looking at a wall and a ceiling with 2 lights, making the speaker approximately 2.4 metres tall? Because I don't think that's a "mini build", dude.
 
If you want to DIY it, just get a 4 battery 18650 holder in 2s config and that charge controller. Probably cost more than a powerbank of similar capacity though
 
That TP4056 board is for charging li-ion batteries and not your typical nicad, etc. AA batteries.

You'd be looking at 18650, etc. batteries as above which aren't cheap but give great power density.

Depending on the voltage input range of your speaker you might need a boost board as well which potentially has some power supply noise considerations - with a li-ion battery you are looking at 4.2v dropping to around 3.7 as the battery is discharged as the output from those boards.

EDIT: Looks like the Bluetooth board has a voltage controller/booster on it.
 
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