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12V to 9V Converter Circuit Using LM7809 Regulator IC
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Make 12v to 9v, 12v to 5v, 5v to 3.3v and 3.3v to 5v Converter : 5 Steps - Instructables
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How to convert 12 volts to 9 volts from a PSU with an L7809 transistor and a breadboard - Quora
