I plugged it into the Airport Extreme, the light came on and it worked like a charm. This completed construction of the new power supply. Then, being observant of polarity, I connected the wire going to the center of the power plug to the positive (+) terminal on the power supply and the wire going to the outer ring to the negative (-) terminal on the power supply (hooking them up correctly is critically important!!). I then used some speaker cable and soldered the speaker wires onto the new connector. Then I went to Radio Shack and bought Size L Coaxial DC Power Plugs (you only need one, but they are sold in pairs). I found one rated at 1.75 amps (close enough to the required 1.8 amps and a lot more than the 1 amp of the Apple power supply). (Perhaps this was an Apple-planned equipment self destruction and, besides, any new one would also be rated at only 1 amp and be destined for destruction by overload).īeing a ham radio operator, I have a few Radio Shack 12 volt power supplies I've picked up at swap meets for a few dollars each. However, the supplied Apple power supply was only rated for 1 amp. According to the cover on Airport Extreme, it requires 12 volts at 1.8 amps. After finding that the replacement cost is about $50 and seeing that the old unit is sealed for eternity preventing access for repair, I decided to see if an easy, inexpensive substitute could be made. The power supply on my Airport Extreme died on me today.
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