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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
ledzep567

12 years ago

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

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ledzep567
ledzep567

12 years ago

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
Brennn10

12 years ago

Radioshack has 12V regulators.

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killerjackalope
killerjackalope

12 years ago

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
gimmelotsarobots

12 years ago

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

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Kiteman
Kiteman

Reply 12 years ago

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

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ledzep567
ledzep567

Reply 12 years ago

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

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PKM
PKM

Reply 12 years ago

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.