hi.
i use a laptop and know for shure its USB's power down when i disconnect it.
i thought of just controling the power lines, but the USB connector as 4 pins, two of which, the outer ones which i'd guess are the power lines, are advanced relative to the inside ones. i think they meant to connect first power, then data lines.
i could use a relay in the USB power line to control the AC line, but i also would want to use a switch to control that relay, like ON-OFF-AUTO. in that case the data line would remain connected.
Can the USB input have signal in the data lines without power connected?
Since i won't be disconnecting the connectors the data lines will be always on. do i have to switch them off as well? In what way?
Warm regards,
Ameal