Discount SE - Step Less Speed Controller - Electronic, 15 Amps

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This product is a bummer. I've had two of them die in 6 months. I suggest the slightly more expensive, Activeair fan controller.

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I ordered 3 Speedster Fan controllers.

They worked fine for the first month....

now my variable speed does not work unless i turn it all the way to high... it just stalls out otherwise and moves very very slow(still moves though)

So 3/3 do not work after 1 month, (probably only 3weeks).

Very disappointed.

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Product is actually for motors with brushes. I bought to use with inline fan. It will function to adjust RPM, however the dial at 1 point is go go and beyond that it fails to be consistent. At a certain point on the dial it is not effective at maintaining the RPM. I think it will work great with router and similar tools but not ideal for fan motors.

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I bought this product and plugged it in and it worked as stated. But it slows the engine speed by changing the sine wave of your Alternating Current (A/C) current into a Square Wave. Why is this bad? A/C appliances are made to run with a smooth ramp up and a smooth ramp down. By changing this into a square wave, it's 100% plus, then zero, then 100% minus, without a ramp. This produced an immediate hum in my fan as soon as I slowed the engine with this device. It will also reduce the efficiency and shorten the bearing life of your fan. Electronic equipment nearby may suffer from electrical noise such as lines on your TV or hum in your sound system.

I suggest this product as an alternative: Variac Variable Transformer

3 Amp Variac Variable Transformer, 300va Max, 0-130 Volt Output

It costs more, but it will last much longer. And it can be used on many other things in your house. You can actually dim Compact Fluorescent Light Bulbs (CFLs) with this product. I have one of these that was made in the 1970s and it still works today. It slows your fan by reducing the voltage. A Variac does not change the A/C sine wave.

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I use this with my cheap 4 1/2 inch angle grinders which have only two speeds,

1. Zero R.P.M. or

2. 11000 R.P.M. which is a bit much especially when using a wire brush wheel.

I usually set this at "Medium" and have much better control of the tool attached.

I've used it for several hours at a stretch and haven't had any problems.

NOTE: FOR USE WITH BRUSH TYPE MOTORS ONLY!