Rep: 37
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When hooked up to a dc power supply. My adapter shows the exact voltage that the power supply is putting out. If i load it with 16.5 volts when checked with a multimeter when it's not connected to a mac it shows 16.5 volts. Is this normal or is it supposed to be 6 volts then 16.5 volts when a load is applied? It's magsafe 1 L type connector. The connector sense is 1.7 volts.
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Rep: 37
3
Apparantly when connected via dc power supply it is always outputting 16.5 volts to the charger tip. However when connected via the apple psu block it looks like it supplys 5 volts then exactly 1 second later it ramps it up to 16-18 volts to avoid sparks.
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Review this article: Macbook charger teardown: The surprising complexity inside Apple's power adapter it should help explain things.
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