Simple Dremel TRIAC Hack Repair

Dremel Repair

It’s a wonderful thing to see a clever hack repair instead of disposing of a product. The best repair approach is finding exact replacement components, but sometimes exact components can’t be sourced or cross-referenced. Other times the product isn’t worth the shipping cost for replacement parts or you just don’t have time to wait for parts. That’s when you need to really know how something works electronically so you can source suitable replacement components from your junk bin to complete the repair. This is exactly what [Daniel Jose Viana] did when his 110 volt Dremel tool popped its TRIAC after he plugged it into a 220 volt outlet.

[Daniel] knew how the TRIAC functioned in the circuit and also knew that a standard TRIAC of sufficient specifications could be used as a replacement even if it didn’t have the correct form factor to fit the PCB layout. For [Daniel’s] tool repair he had to think outside the box enough to realize he could use some jumper wires and snuggle a larger TIC206E TRIAC that wasn’t meant for the device but still applicable into the housing where there was enough free space. A little shrink-wrap and all was good again. Sure the fix was simple, but let’s not trivialize the knowledge he needed for this repair.

And if you’re wondering if it worked, he notes that he’s been using this tool for three years since the repair. We thank [Daniel] for sharing this tip and allowing us to add this to our tool belt of Dremel repair tricks.


  1. Paul Casucci says:
  2. ftkalcevic says:

    That “Dremel repair tricks” link just goes to single page showing how to fix your dremel battery pack. Is that correct? I was expecting a link to at least two stories.

  3. mjrippe says:

    Excellent work! When replacing components it really takes a knowledge of which specs are important. I often have to replace obsolete audio parts and figuring out what specs have to match is half the battle.

  4. aztraph says:

    i find it interesting that he was able to repair something with such skill after toasting it because of something so level 1 like voltage

    • wholostwhat says:

      It ranks alongside grabbing the hot end of a soldering iron. Yes it’s a daft mistake, but commonly made when distracted by other aspects of what you’re doing.

      • aztraph says:

        We now have a level 0. I have never done that, even when i was once drunk soldering. I value my hide to much for that.

        • McSquid says:

          So glad at least one other person sometimes solders drunk

          • Sven says:

            Drunk soldering is great, especially if you are making something with small SMD parts, you really need a steady hand then.

            That’s why all electronics hobby labs should have a beer fridge. (soldering drunk at work, or other ways making drunk soldering an every day occurrence would be bad, and could possibly lead to alcoholism or at least liver damage).

        • John Smith says:

          I’ve never grabbed the hot end, but back when I had long hair I once brushed my hair back while holding the iron. Instant, horrible smelling trim. Sometimes stupid happens.

          • aztraph says:

            I got a better one, I was soldering a refrigeration line, the capillary tube on a refrigerator to be specific, and some solder made it into the cap tube. Well the only way to get it out is with heat and the smallest amount of pressure I could get out of a nitrogen tank. I think I had less than 5lbs, my gauges didn’t go that detailed on my regulator. Whatever the pressure was it was able to propel about 1/2 a gram of solder, when it melted, straight up and into my shirt pocket and wedged itself between my phone and shirt. It left a mark on my shirt and burned my left nipple. I was rightly laughed at by my wife when I showed her.

      • 0xfred says:

        Hot air SMD soldering and making Creme Brulee at the same time is also not recommended. The sugar gets blown all over your workbench rather than caramelising.

  5. wholostwhat says:

    “Sure the fix was simple, but let’s not trivialize the knowledge he needed for this repair.”

    It’s like the old story of the retired engineer being called back in to fix a vital machine and does so by thumping it on the side. When his bill for $5005 is queried he explains “$5 for hitting the machine, $5000 for knowing exactly where to hit it and with how much force.”

    Knowledge/experience is vastly underrated by many these days, though I’d guess HaD isn’t one of those places.

  6. Nova says:

    After reading to the URL linked in the article all I could think of was “Oooooh, I popped it!” dammit PhotonicInduction.

  7. pcf11 says:

    If a Dremel could go as fast as it should then a speed controller would be a somewhat useful feature. As things stand Dremels run about a third as fast as they should full speed. So with that in mind simply bypass the speed controller. You’re not losing anything valuable.

    Anyone who wants to argue with me had better know how to figure out surface speeds because I don’t suffer fools gladly. I already did the math on this one. You have been warned!

  8. Yates says:

    I have the same model dremel. I had the problem that the little button you press to lock the shaft (so you can change the implement) wasn’t working anymore. I took it apart and instead of a nice pin shape that would stick in a hole in the shaft to hold it, there was just a nub…

    So I welded it.

  9. MatsSvensson says:

    Disappointed when i realized the article wasn’t about fixing a triac with a dremel….

  10. ejonesss says:

    “his 110 volt Dremel tool popped its TRIAC after he plugged it into a 220 volt outlet”

    of course it would do some damage..

    fortunately it was just to the speed control and not the motor.

    also i am not sure how you got the tool connected to a 220 source.

    i tested one of the plug adaptors that now comes included with some stuff in a electric dryer outlet and it would not fit because the international outlets use a different prong spacing and angle.

    even a full international plug kit i doubt it will work in an american 220 outlet.

    i could not test the range outlet since it is behind the kitchen stove and i could not reach it.

    my guess he had to cut the cord and splice on a 220 cord or build a home made cord.

    one outlet i did not try is the 30 amp outlet used by permanently mounted 220 window air conditioners

  11. David K says:

    Great hack, unfortunately the little circuit board cracked on mine when i was trying to take it out, so i just jumped it an have a full speed only option.

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