A battery charger was repaired. There was an old inverter welder. It had no case (The case had been taken by a previous owner of this junked equipment to use as a stool) The unit had some issue with regulation possibly due to a burned resistor. My friends decided to check it out. (the author did not mess with this but the video they shot is worth posting) This machine made some really interesting noises. The video shows this and it is well worth watching.

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21MB higher quality version of the video as shown in sample on right