Thanks Michael Paley! We've added your Power Tool Speed Controller to our Electrical category,
as well as to your builder page: Michael Paley's Homemade Tools. Your receipt:
New plans added on 11/04: Click here for 2,561 plans for homemade tools.
heh I should post my phase fired AC circuits. I actually make the electronics for these things. They're simple devices. The only trick is using the right AT leg on the triac for the input current. I think it has something do to with the topography of the device? All I really know is backwards they don't work. Alternating current has more polarity than most realize it does. More than I gave it credit for before messing with it. Autotransformers don't work hooked up backwards either. That's where I first discovered the phenomena for myself. Live and neutral are different beasts. But here's a schematic for the simplest dimmer http://i.imgur.com/GE3ZXqP.png and you tie the neutrals and run the live through the circuit. Here's what that looks like physically https://i.imgur.com/M7WENhG.jpg Not much to it.
I never looked inside the Harbor Freight speed controller. So I can't say for sure what's inside it. I would not say mine is any better for the tool. It may be more rugged than what you can buy commercially. I haven't looked in the HF speed controller but I've looked in others. The part that does the work in all of them (the TRIAC) tends to be marginal. Now maybe HF put a really good part in theirs? But if they did they'd be the first. Which is why I just made one. Because everything I have seen has all been junk. But semiconductor technology has come a ways. The decent TRIAC I did use did not cost me much to buy. Like 25 cents. You'd think the manufacturer would splurge if the part was that critical. So far I haven't seen it myself.
Chadboye (Dec 1, 2021)
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