Plasma TV to A Plasma Cutter.

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  • spleenharvester
    Reverse engineering of DoCreate DHJ567 handheld spot welder
    by spleenharvester
    Hello everyone

    I attach a schematic and teardown photos for the DoCreate DHJ567 handheld spot welder. I bought this welder for temporary use while my supercapacitor welder was waiting for replacement parts. It cost only £24, though there is a screenless version available for £17.

    Performance: The absolute maximum it can handle appears to be 0.15mm of pure nickel. Reliability was not great - welds were very inconsistent, ranging from weak attachment to burning through the strip. However, I was able to build a 5S2P pack without losing any cells. It's a bit difficult getting...
    05-08-2025, 02:52 PM
  • Biruslapio
    Plasma Y board IGBT equivalency question
    by Biruslapio
    I have two TVs here with both Y-SUS failures, one LG and one Samsung.
    The Samsung's Y-main shorted one FGD4536 and one RJP63K2(there are two in parallel)

    I have the FGD but I only have one RJP63F3, which is different from the K2, so, can two 30J124 be put in place of two RJP63K2? are they equivalent?

    Also for the LG two 30F131 shorted, I have some FGD4536 (the same that are used on the samsung), can they be also be a substitute without issues?

    RJP63F3 and K2 are 630V 30A IGBTs, but their rise/fall time and other internal variants differ.
    ...
    04-06-2023, 08:09 AM
  • sam_sam_sam
    Is there any high current pouch battery that are size 60mmX80mm maximum thickness 21mm for a battery operated tab welder
    by sam_sam_sam
    I have a battery operated tab welder and the battery does not have enough current for the battery tab welder because after about 30 welded it does not have the same current output it voltage has gone down by at least 0.500 volts or maybe a more than that

    I can fit 21700 battery cells in the enclosure it is very tight fit for four of them that are 35 amp high current capacity 35X4=140 high current output this should work a lot better than what is installed right now

    I tested the battery cells there are installed right now and they are testing good with no issues that I...
    02-04-2025, 08:08 PM
  • sam_sam_sam
    Hypertherm Plasma Chopper IGBT Module failure successful repair
    by sam_sam_sam
    I have several chopper units that need to be repaired but just repaired one of them to see if it could be done successfully which they can be repaired

    The company that makes the IGBT module have discontinued this part as 5/30/2020 which our company has bought 12 IGBT modules which will allow me to repair 6 chopper units ( one note there is no direct replacement availability )

    I am buying these modules directly from the manufacturer
    But there is a 8 week lead time

    Now you can find on EBay for half the price but I have a feeling that might be fake...
    06-07-2020, 11:08 AM
  • mikkele86
    Power amplifier SMPS IGBT keeps blowing - Artcoustic PDA1000
    by mikkele86
    hello.

    I have two power amplifiers, both having their IGBT blown on the PSU.
    The original mounted IGBT where marked with IRGB20B60PD1PbF and the gate driver is a IR2156STRPBF.

    I looked at mouser and digikey and could not find any available IRGB20B60PD1PbF and somehow ended up using a Bourns BIDW20N60T.
    I replaced the gate driver, the gate resistor and both IGBT. But as soon power is turned on, both IGBT shorts out completely (gate, emitter, collector) and the fuse on the AC line gets killed.

    So I though i missed a capacitor or diode. I removed...
    01-06-2024, 06:45 AM
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