[IMGCAP(1)]There’s an evil demon lurking behind your wall. It’s hiding in your AC outlets, just waiting to wreak havoc on your expensive PCs and peripherals. It’s called line power, and it’s up to no good.

[IMGCAP(2)]Many of us take our power company’s claim of providing 110 volts AC at the wall outlet as being more or less truthful. It’s not—over time, the voltage at your outlet can vary from 90 volts or less to 140 volts or more. And that’s under normal operating conditions. It doesn’t take into account that the power in this country is full of power drop offs, power spikes, and noise on the line that rides along with the expected sine wave of current sweeping from positive to negative and back (the AC stands for alternating current).

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