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they have found that the minelab pi's work much better if the input voltage is increased from 6 volts to 7.3 volts....using 7.3 volt (8.4 when full charged) li-ion camcorder batteries...i need to build a regulater that steps the voltage down from 8.4 to 7.3...does anyone have a curcuit that would do this?...please reply to [email protected]