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How to get 12 volts from 18 volts Answered

How would i regulate 18 volts(2 9v batteries) to put out 12 volts instead? im doing this because 2 6v batteries is really heavy(im replacing 2 6v batteries, and they are also broken... dont ask how) thanks

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ledzep567 (author)2008-06-12

WAIT couldnt i just use 8 AA batteries??????? thats 12v

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ledzep567 (author)2008-06-12

ok well seeing as this isnt my device im risking the death of (and the fact that it cost like 200 hundred bucks) its (boiled down) a cassette player with a long cord going to a speaker and its purpose is to project sound a ways a way. so im guessing id be best off getting a 12v regulator from radioshack?

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Brennn10 (author)2008-06-12

Radioshack has 12V regulators.

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killerjackalope (author)2008-06-12

hows about a nice and simple voltage divider...

two resistors in series the middle take off is 12V

the ratio would be 12:6 so anything like

for sake of argument:

18V+---|600ohms|----------|1200ohms|
`````````````````````````````|
````````````````````````12V out

Ignore the " ` "s they're for formatting only...

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gimmelotsarobots (author)2008-06-12

LM7812, like NachoMahma said. Pins go input ground output.

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Kiteman (author)Kiteman2008-06-12

(I reckon it was a bizarre macho-juggling accident)

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ledzep567 (author)NachoMahma2008-06-12

wow, thats interesting... i was hoping just a resistor hahaha but il look into that. thanks

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PKM (author)ledzep5672008-06-12

It also depends what you want it for- if you want it for a 12V light you could just use a resistor but you'd be wasting 1/3 of your power. If you want it for anything more complicated than a lightbulb you will probably have to use a voltage regulator like the ones Nacho linked you to.

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