Usb Board Cable
Usb Board Cable
What is the USB 2.0 voltage output?
i am taking an electrical engineering course and a circuit board i have is made to run on 5V... the power adapter for it is very large and heavy, so i want to use the power from a USB 2.0 wire using the Red/Black wires (cut and soldered to the circuit board) and ignoring the Green/White (data) wires... i was told that the power output of any USB cable is supposed to be 5 +- 0.25V but when i plug the cable into my computer and measure the voltage via voltmeter of the exposed wires, the voltage reads about 6.65V. Am i mistaken or is there something wrong with my thinking/measuring?
The USB voltage is supposed to come from the +5V line of your PC power supply, which is supposed to be 5V +/- 5%. The current limit is 500ma for USB 2.0
Not all power supplies are particularly well calibrated, however. Odds are very high if you check the voltage on a different PC you'll get a substantially different voltage.
One bizzare thought - are you measuring VDC or VAC? There can be noticeable ripple in that DC line.
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