I have a portable multitrack digital recorder which I'd like to use where there's no power available for longer periods of time than regular alkaline dry cells allow. I'd like to use this 11.1 volts 4400 mAh battery pack salvaged from an old laptop. The current draw of the recorder is 200 mA.
Electronic – the simplest and cheapest way to convert 11.1VDC battery pack to regulated 9VDC
dc/dc converter
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Best Answer
To convert 11.1 V to 9V you can simply use the 7809 regulator IC.