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Portable Audio System, I need Help Making Scematics! Answered

I'm a little stuck here, I obviously don't do circuitry work every day, but I do know what is what. I have a lawnmower battery, and a set of both a 9 volt operated pair of computer speakers, and a 15 volt subwoofer set. I was planning on using the subwoofer set initially, but it sucks a lot with it going through the inverter and whatnot, rather inefficient. I was trying to find scematics for a simple circuit to power the speakers without going through the inverter.

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Punkguyta

12 years ago

I was thinking a one of those regulators would do, but I don't have any electronics stores around here that really supply any components like that. And yes, the lawnmower batter is 12 volts, but it's like half the size of a car battery, so it's a lot lower in capacity.

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westfw

12 years ago

I would be EXTREMELY temped to try operating your 15V speaker set directly off of your 12V battery (it is 12V and not 6V, right?) The electronics inside a speaker amplifier is mostly likely an analog circuit designed for a relatively wide supply range, and it might work just fine. For the same reason, I'd be SOMEWHAT tempted to operate the 9V set directly from 12V... Alternately, it should be easy to regulate 12V to 9V using three-terminal voltage regulators (lm7809; probably hard to find, or a lm7805 or lm317 set up to yield 9V - see the datasheets.)