So are you going to make a circle on every piece of technology in the room, before shooting the enemy?
No, but someone asked about a ward that protects tech from magic- I'm pretty sure this is exactly a circle. I wouldn't take the time to put wards up in a room around my valuables/allies before shooting the bad-guy either, even if I thought they were at risk... wrong place, wrong time, so bad example. I was pointing out that it would be a lot simpler to draw a couple curved lines and pop some blood or willpower than to invest energy in some sort of fixed ward that may or may not work, may or may not last long, and may or may not have the same issues a circle does.
Anyways... this led me to a funny mental image... given Butters was able to protect the GPS from ambient magic and harry's presence with a circle, and it was still able to send and receive signal/data through the circle no problem (thus, doing so doesn't qualify for breaking the circle)...
Could a wizard use a computer if he kept it in a circle, using a wireless (or even wired, run under the circle) mouse and keyboard? Only the mouse and keyboard would be exposed to his mana static, and they really haven't changed much in the last 20-30 years beyond switching from serial to usb... so a younger wizard, molly's age, say, using wired serial keyboard and mouse run under the floorboards and therefore the circle, might not have any problems at all. Even USB or Wireless, you'd burn through them, but not often enough to really suck.
And now I'm stuck with this mental image of a 20 y.o. Apprentice Wizard with a love for his old life and tech, just can't give up his rig... sitting in his room, circle around his compy, and a pile of burnt out keyboards stacked up in one corner.