Macbook charger teardown: The surprising complexity inside Apple's power adapter
Counterfeit components at its best : r/techsupportgore
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LEORY 650W Power Supply Passive PFC Silent Fan ATX 20/24pin 12V PC Computer SATA Gaming PC Power Supply - AliExpress
Factor PFC Into Your Power-Supply Design | Electronic Design
Active PFC
Note: Fake PFC Inductor Found in a Generic ATX PSU | Gough's Tech Zone
1000W 110/220V PC Power Supply Passive PFC Power Supply 12cm RGB fan PC Computer Gaming Power Supply EMI Temperature Control US|PC Power Supplies| - AliExpress
Fake PFC Made of Cement
power supply - What is this transformer-like component, and why is it not really connected? - Electrical Engineering Stack Exchange