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12v dc to 18.5v dc step up

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lpkvh08

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Hey guys! i have a 12v 22Ah lead acid battery. i want a circuit that will give me an output of 18.5v DC at 3.5A (regulated)... I'm modifying my old laptop and its battery is damaged.
 

use this circuit.you can use this for laptop
 

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    lpkvh08

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missing parts for the schematics pcb lay file
 

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    lpkvh08

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