Did I blow up my adapter ?

Discussion in 'General Electronics Chat' started by Avenyr, Jan 19, 2010.

  1. Avenyr

    Thread Starter New Member

    Jan 19, 2010
    So I bought a 3Com 120V AC 60hz 22W to 24V DC 600mA and also bought a 2.5mm mono jack for a device that requires a positive tip 24V DC adapter.

    I made sure the readings were less than 25V before soldering the jack. It was around 19-20V.

    After soldering the jack, the voltage output was less than 0.5V...

    I removed the soldered jack and tested the power adapter directly and the reading on the cables are still less than 0.5V

    I didn't notice and weird smell, the power adapter does not get any hotter than it should be I don't understand what happened or what to do with this.

    Any idea ?

    Thanks !
  2. bertus


    Apr 5, 2008

    It could be that a fuse inside the adapter is blown.
    This could be done by making a short in the jack.

  3. knowitall

    New Member

    Jan 10, 2010
    If you shorted the two wires even for a short time on a 24V 600 ma adapt. you probably overloaded the single diode off the Xfmr. in which case its shorted ( the diode ), measure the output of the adapt. using the A.C. range on your multi-meter, If it measures aprox. 24 Vac then break open that bad boy and replace the diode with any generic replacment diode.
    You could also measure for continuity on the two wires, if the diode is O.K. you should find continuity One way, if in both directions, the diode is bad, shorted, do this test with the adapt. un plugged. of course.

    Also remember that when inserting a plug as you have described it will short as the plug is inserted into the receptical, so un plug the adapt. before energizing your target device.
    Last edited: Jan 19, 2010
  4. S_lannan

    Active Member

    Jun 20, 2007
    If you had it running while you were soldering the jack, you may have shorted it to ground as the tip of the soldering iron is connected to ground.