The old way of charging battery
Effective and simple way.
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Warning You must be careful when construct this circuit because of direct contact with a killed voltage of 220V
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The lamp set to determine a constant limited current through the battery.
300W
I= --------------------------- = 1.4 Amps
(220)-(12+1.4) V
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No heat sink
No more Regulators
No more power transistors
Just a waste of power in the lamp and this can be solved by using this lamp for lighting your room ^^
Enjoy..
