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  1. babawushika

    BT139F triac replacement

    Can I replace BT139F with BT137F?
  2. babawushika

    BT139F triac replacement

    Thanks-do you know a replacement for BT139F?
  3. babawushika

    BT139F triac replacement

    It has to be - it had worked fine in many previous years in much hotter days.
  4. babawushika

    BT139F triac replacement

    Hi everyone, I used to design PCBs, but it was 15 years ago. Now I am in IT. I had a deducted evaporative cooling system. It has a PCB controller. Starting this summer (in Australia), when the temperature is not too high, it works fine. When it is really hot, it shuts down and the water valve...

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