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+9V *and* -9V from one battery!

2015-03-20 02:11  
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The MAX1044 is a charge pump converter - it uses a capacitor as a `bucket` to pump charge from one place to another. In this case, the 1044 connects the + terminal of C1 to +9V from the battery and its negative terminal to ground. C1 charges up to 9V from the battery. The 1044 then connects the + terminal of C1 to ground, and the - terminal to pin 5. visit page.+9V *and* -9V from one battery! - schematic