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power supply - What is this white stuff inside this circuit board? - Electrical Engineering Stack Exchange
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19.5V 4.62A 90W Ac Laptop Charger for HP H6Y88AA H6Y89AA 710413-001 Adapter Blue Tip : 4.5 X 3mm with Center Pin Inside Notebook Computer PC Power Cord Supply Source Plug - Walmart.com
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Amazon.com: DTK 19V 4.74A 90W Ac Adapter for Samsung Laptop Computer Charger/Notebook PC Power Cord Supply Source Plug (19V 3.16A 60W Compatible) Connector Tip Size: 5.5x3mm with Pins Inside : Electronics
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Macbook charger teardown: The surprising complexity inside Apple's power ad… | Switched mode power supply, Electronic schematics, Electronics projects for beginners
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