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Electrical Engineering
Novice question about Relays, Capacitors, and Diodes
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[QUOTE="Tom.G, post: 6209674, member: 581973"] To use the "USB" label, devices must meet the USB specifications. here is an excerpt from[i]USB Serial Bus Specification[/i] Revision 2.0, April 27, 2000, page 175 of 650: "7.2.2 Voltage Drop Budget The voltage drop budget is determined from the following: • The voltage supplied by high-powered hub ports is 4.75 V to 5.25 V. • The voltage supplied by low-powered hub ports is 4.4 V to 5.25 V." So that is the voltage range you must accept. Included in the same zip file is [i]Universal Serial Bus Power Delivery Specification[/i] (394 pgs) The full standard is available at: http://www.usb.org/developers/docs/usb_20_070113.zip It is a 37MB zip file of about 2000 pages. (Bedtime reading for 7 months!) Have Fun! Tom [/QUOTE]
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Novice question about Relays, Capacitors, and Diodes
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