What purpose does the small cylindrical module near the end of my laptop charger cable serve? - Quora
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Variable Bench Power Supply From Scratch Using Laptop Adapter & LM317 (with Pictures) - Instructables
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power supply - Laptop connectors and universal chargers (tips M3, M4, etc.) - Electrical Engineering Stack Exchange
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What purpose does the small cylindrical module near the end of my laptop charger cable serve? - Quora
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