I usually find some old alims and remove the casing for my projects. You can find simple schematics easily depending on what efficiency you need

get a 12v or multi-voltage power brick from an electronics store (or some online shop, i suppose)

Just get step up module from China and a battery

Some 18650 battery cells with integrated protection, a holder for them, and a DC/DC converter (3.0-3.7) to 12V, depending on what technology the batteries are based on.
You can always abuse old powerbanks to serve as a 18650 charger.

- Or -

A LiPo battery pack in the 11v range (for RC things n shit), a LiPo undervoltage protection circuit, and a 8-19v to 12vdc DC/DC converter or some shit, and a cheap charger.

- Or -

A 12V Powerbank. Has all the protection and shit built in, and also has some 5V outputs. Quite expensive, but i'd recommend using a powerbank.
I wouldn't recommend a simple 5V powerbank, because you would need to get like 4A@5V to step it up to [email protected] (assuming non 100% efficiency, idk)


Lead batteries are heavy and big, and have a low energy density. I wouldn't recommend using them in your actual case.

Be sure to use protection circuits if you're working with "sensitive" batteries, such as 18650, lipo and all that shit (undervoltage, overheating, etc).

>>54684687
If you need more than 1 amp (like for a sound amplifier), Led lights power sources are the best. I use one for my portable diy boombox and its great. Cheap, stable and can find them anywhere.

>>54684687
Go buy a Yamaha ps150. 12v PSU for their keyboards and does.up to 1.5A

>>54684926
>>54686091
"Hello! I need a 12v source for my
>portable<
speaker circuit (...)"

>>54686144
Shit didnt see the portable part

>>54686144
he didn't say the supply needed to be portable

>>54686243
Please read the OP again.

>>54686282
ok, read it again, still doesn't say the supply needs to be portable

think of it like this, imagine if i asked about a power supply for my phone, would you assumed i meant a usb wall charger? or a battery?

i'm not trying to be smart, i honestly assumed op was talking about a mains supply

>>54686375
He needs a 12V source for his portable speaker circuit.

Yeah, he didnt mention the source to be portable, but i assume that he meant something like a battery or so to power his shit.

>>54686423
i must be tired, the word "circuit" makes a battery a better assumption, must have skimmed over it

>>54684687
Get a 12V UPS battery those things are gucci when it comes to mobile power they come in varius shapes and sizes and they come from 3 Amp's per hour to 5.
Alternatively you can just stack lithium cells and buy a charger it's cheaper but not better.