Riorand DC 3V 6V 12V 24V 35V 5A Motor Speed Controller PWM Speed Control Ultra Small LED Dimmer（2PCS）
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I use mine as an LED dimmer, which you are correct about. There's a good chance it won't be more than 1A. It performs admirably in this regard, but it should be rated at around 2A.
You'll need to use a buck converter to reduce the voltage first, but it will work in that case.
Because it is not passive, it will consume some power as long as it is turned on; if your application is to control a motor, lighting, or other device, this should only be on when the device you are controlling is turned on. It's not an on/off switch, but rather an attenutor that controls the item's function by limiting the voltage to it.
Selected User Reviews For Riorand DC 3V 6V 12V 24V 35V 5A Motor Speed Controller PWM Speed Control Ultra Small LED Dimmer（2PCS）
These are used as 12V LED dimmers (with the appropriate current limiting resistor in series with the LED leg). My PWM units are quiet and provide a good amount of dimming. There's also an off detent on the potentiometer.
For dimming my 14V LED lights, these are ideal. The resettable fuses hanging off the back of the boards, on the other hand, make me nervous. I suppose they'd be simple to replace if they blew, either with new ones or regular fuses. It's a nice feature, and if you put them somewhere safe, it won't be an issue. These will also turn off completely with a satisfying click at the "end" of the controller knob rotation. I was expecting to have to add my own switches, but that is no longer necessary. I wasn't aware of this when I purchased them. Another feature that I really like.
This PWM controller appears to work properly, but there is a significant issue when using input voltages less than 4V, which I will explain further down. br>br>With a single Li ion cell as the input, I wanted to use this controller to control the power output to some resistive heaters. It was simply ineffective. The output current was extremely low, and the FET quickly became extremely hot. To work with a lower voltage range, I bridged the solder points on the circuit board. The problem is that the gate voltage supplied to the FET at these low voltages is insufficient. The gate voltage was approximately 1V lower than the input voltage, according to my measurements. As such, a 3 is required. The gate voltage on a 5V Li ion cell is below the threshold, and the FET resistance is extremely high. Low output current and FET heating resulted as a result of this. The problem was solved when I changed the design of my project to include a 2s Li ion battery. br>br>The seller should take note of this problem, as I believe it is the source of several negative reviews.
It really works. In my water cooling loop, I use them to control a pump and five PC fans. br>br>*UPDATE* possibly 3- For these, 4 months of daily, sometimes overnight use was too much. One was for my pump, and the other was for five radiator fans, which was too many. I'm deducting one star because they're so cheap, and I needed a better solution in any case. They did a good job for a long time, but one of them failed to deliver on his promise to me.
This was used as a fan switch for the oven in my RV. I'm sick of the fan being turned up to eleven. Now I can turn on the fan quietly (slowly) and leave it running while watching TV.
As supplied, there are missing screws. Returned.
These are not 5a, as the name implies, but 2a. They arrived in good condition, so I can't blame the product for the misleading title, but I can blame the seller.
Poor quality, not long-lasting, and broke down after only a few weeks of light use.
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