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Charging Cell Phone through PC Power

Discussion in 'Electronic Basics' started by Fijbak Efferzin, Feb 14, 2004.

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  1. I've been charging my cell phone using a cigarette lighter socket wired into
    my computer's power supply, positive connected to the +12V line, negative
    connected to the chassis. It seems to be working perfectly.

    Is there any reason why I *shouldn't* do this? It's a 250W power supply
    running an Athon 950 processor. I only have one hard drive, two CD drives,
    and the cell phone connected, so the power consumption doesn't seem to be an
    issue. Is there a chance that hot-swapping devices could produce a damaging
    surge? If the phone is transmitting, is there a possibility of interference
    being generated by the phone, traveling through to the power supply and
    mucking things up?
  2. Ian Stirling

    Ian Stirling Guest

    To be ultra-safe, you might wire a one ohm resistor in series with
    the positive line and a .1uf capacitor from ground to the PC side,
    to reduce the effect of any spikes on the PC.
  3. Thanks for the reply.
  4. Ian Stirling

    Ian Stirling Guest

    A 0.5A fuse in series with the 1 ohm 1W resistor too, in case someone plugs
    a lighter in, or the cable to the phone shorts, but ...
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