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Apple Computing Products:
macOS - Notebook Hardware
Mac USB Power Output Control
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<blockquote data-quote="techiesteve" data-source="post: 1674221" data-attributes="member: 98520"><p>I'm not aware of any way of any way of varying the 5V output on the USB sockets. Apple designed the USB interface to supply a stable 5V, there is no logical reason for them to to have made the 5V variable.</p><p></p><p>Options may be to see if anyone makes a variable speed USB fan, a battery powered USB fan or a mains powered variable speed fan. More complex would be to design an efficient switching voltage regulator fed from the USB ports 5V, as a linear regulator would likely have too higher forward voltage drop. Possible if you are an electronics engineer with time on your hands, otherwise completely OTT.</p></blockquote><p></p>
[QUOTE="techiesteve, post: 1674221, member: 98520"] I'm not aware of any way of any way of varying the 5V output on the USB sockets. Apple designed the USB interface to supply a stable 5V, there is no logical reason for them to to have made the 5V variable. Options may be to see if anyone makes a variable speed USB fan, a battery powered USB fan or a mains powered variable speed fan. More complex would be to design an efficient switching voltage regulator fed from the USB ports 5V, as a linear regulator would likely have too higher forward voltage drop. Possible if you are an electronics engineer with time on your hands, otherwise completely OTT. [/QUOTE]
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Apple Computing Products:
macOS - Notebook Hardware
Mac USB Power Output Control
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