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how can i use 12v battery for my 3.7v portable speaker?

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Alvin Estrella

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how can i use 12v battery for my 3.7v portable speaker?
 

Alvin Estrella said:
how can i use 12v battery for my 3.7v portable speaker?
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Try this adapter. This having 3A out put but one speaker required only 400mA max. So you can use multiple speakers.

**broken link removed**
 

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