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CT-96 Adjustable temp soldering iron, circuit help..

Discussion in 'General Electronics Discussion' started by tkid, Jan 16, 2014.

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  1. tkid

    tkid

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    Jan 16, 2014
    Hi, I have a CT-96 adjustable temp soldering iron which works great initially, but after around 12 mths of intermittent use, it stopped working.. What i found was that the MAC97A8 Triac had failed, along with the LM358 op-amp had also failed.
    Replacing these fixed it, for at least another 12mths!
    What I would like, is if anyone is familiar with the circuit for these things, to suggest what else I could do to improve the reliability of the circuit to prevent the eventual failure of the MAC97A8 and LM358? I have attached photo showing both component and copper track sides, and if there is enough interest, I would be happy to map out the circuit and post as well.. Thanks in advance..
     

    Attached Files:

    Last edited: Jan 16, 2014
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    What was the failure mode of the triac?

    It might be useful to get a higher voltage rated triac.

    It also might be useful to place a large MOV across the power connections inside the soldering iron.

    You'll know if this works in about 13 months...
     
  3. tkid

    tkid

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    Jan 16, 2014
    Thanks for the quick reply.. the Triac failed with shorts between MT1 and MT2 to Gate, measured around 150Ω resistance between them. I will look into getting a suitable upgrade to the triac, and maybe add a snubber network across it as well?
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    The load is probably dominantly resistive, so I don't think you'll need a snubber network, but it can't hurt.
     
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