How to make led voltage regulator with bc547 transistor

How to make led voltage regulator with bc547 transistor
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components:-
(1) 10k volume switch,
(2) bc547 transistor,
(3) 3.7v lithium battery,
(4) 4v led chain light,
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[@bunnyenergetic3142]

How much this voltage regulator take energy to run itself . How much it consumes energy .