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Thread: SCR Motor Speed Control made from salvaged parts

  1. #21
    pfredX1's Avatar
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    If you want to buy parts there has never been a better time for that than now. Today we have the Internet. So you can get parts shipped right to your door cheap. Mostly I buy direct from China. There's some waiting involved with that but the prices can't be beat. I'm patient. Right now I could get 10 more of the triacs I used in the dimmers I made for $1.64. They're probably counterfeit but they still work just fine. https://www.aliexpress.com/item/10PC...844754301.html

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    nhengineer's Avatar
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    Schematic?

    Paul Jones, It would be appreciated if you'd share of provide a link for the schemagic for this project.

  3. #23
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    Quote Originally Posted by nhengineer View Post
    Paul Jones, It would be appreciated if you'd share of provide a link for the schemagic for this project.
    Just looking at the circuit board I'd say there are better schematics for making SCR phase fired converters today. We have higher performing parts we can use now. I found this circuit works well http://i.imgur.com/GE3ZXqP.png That's all you really need. It can even handle inductive motor loads. I've run a 600W router on one that I made. You can even get a heavier triac for larger loads. Here's the same circuit with a snubber http://i.imgur.com/iiuSn8H.png Though with the right triac you don't really need a snubber.

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    Paul Jones (09-11-2018)

  5. #24
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    Thank you.

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    Paul Jones (09-11-2018)

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    Nice work. I am having a little trouble translating the solder "circuit" into a working diagram. Would you be able to post a circuit diagram with a list of components so I and others could build one too? Thanks so much - Nick

  8. #26
    pfredX1's Avatar
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    Quote Originally Posted by Nick79 View Post
    Nice work. I am having a little trouble translating the solder "circuit" into a working diagram. Would you be able to post a circuit diagram with a list of components so I and others could build one too? Thanks so much - Nick
    Here is a schematic to a circuit that works fine and is easy to build http://i.imgur.com/GE3ZXqP.png
    You want to get a "snubberless" triac for inductive loads like motors. I used a BTA24-600BW and a DB3 diac with the dimmer I built and it worked fine to speed control a 600W router here. This is what the circuit I built looks like https://i.imgur.com/M7WENhG.jpg
    Quite frankly I wouldn't build the original posted circuit today unless I had a time machine and went back 40 years in it. Then it wouldn't be today though.


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