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Scanner radio works with wrong power supply?

Discussion in 'Electronic Basics' started by Gulfstreme, Jul 18, 2003.

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  1. Gulfstreme

    Gulfstreme Guest

    My radio scanner didn't come with an ac adapter so I'm using one that
    I had lying around (and that fits the plug) and it seems to be working
    fine even though the voltages and amperages are different (see below).

    scanner input - 9v dc 300mA
    wall-wart output - 6.5v dc 2.5A

    Could someone explain how/why this works? It seems to me that 2.5
    amps would be too much since the input calls for 300mA. Is the 2.5A
    wall wart putting out *up to* 2.5A depending on the draw from whatever
    is hooked up to it? Is the 6.5 volts just *enough* to power up and
    use the scanner? I've just been wondering about this for a while
    now.. thanks for your replies.

    BTW: the scanner is a Radio Shack Pro-95
  2. AC/DCdude17

    AC/DCdude17 Guest

    X-No-Archive: Yes
    I bet the 2.5A 6.5V DC wall-wart puts out about 9V when you're only
    drawing 300mA. It puts out 6.5V when it is under 2.5A of load.
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