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What is this weird plug/transformer?

Discussion in 'General Electronics Discussion' started by seanspotatobusiness, Dec 13, 2016.

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  1. seanspotatobusiness


    Sep 11, 2012
    I have an electrical plug and I don't understand what it's all about. It looks a lot smaller than a transformer usually does and although it says DC5 on the side, I outputs about 4.8 V AC. If I wanted to find out about its use what would I need to type into Google? What usees 4.8 V AC?

    I have this video of it:
  2. Minder


    Apr 24, 2015
    It is a small 5vdc SMPS, Switch Mode Power Supply, commonly know as a 'Wall Wart'
  3. OBW0549


    Jul 5, 2016
    Are you really sure it's putting out AC? Some DMMs can't distinguish between AC and DC when on their AC setting because their input is direct-coupled rather than coupled through a capacitor, and these will interpret a DC voltage as if it were AC. Check the output of your device with the DMM on a DC range and see what you get.

    Is this device the square gadget in the background of your video, plugged into the outlet strip? If so, it strongly resembles the 5 volt, 1 amp charger that came with my Kindle e-reader.
  4. seanspotatobusiness


    Sep 11, 2012
    But it's not a wart! It's vissible in the video immediately behind the probes and connector (which is being probed). I'm familiar with wall warts but they're usually pretty chunk and this is pretty not [chunky]!

    In the video I tested with the DMM set to DC first and then switched to AC. Unfortunately I didn't wait for the reading to settle because it is infact zero when I connect the DMM in DC mode. I would have expected it to fluctuate up and down rather than read zero but maybe that's what this DMM does? [Yes,] the plug is visible plugged into the strip in the background of the video.
  5. 73's de Edd

    73's de Edd

    Aug 21, 2015
    There is not the usual mass and weight factor of a 60~ transformer being inside of the unit.

    Instead, they are rectifying the power input and reverting to the use of a switch mode technology operating on
    up into the xx thousands of cycles or even 100x thousands of cycles and then that developed AC / Sq wave DC is then rectified to pure DC, with only minimal filtering being needed at those high of a conversion frequencies.

    The real kicker for the identification of these types of power converters is their low weights, along with the INPUT VOLTAGE spec of 95----240 Volts AC or DC.
    seanspotatobusiness likes this.
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