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2.Ask the question in English to get answer faster.
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A part of the review has been auto-translated.
This one is Good
But It didn't work to down a voltage
12v to 30v work
12v to 5v didn't work
Cztery gwiazdki za to że utrzymuje Uout dopuki Uin≤Uout.
Dla moich potrzeb wystarczy (Lampa 24VDC zasilana z akumulatora 12V).
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A part of the QA has been auto-translated.