20k ohm potentiometer question

[turtle soup]

Ok so I'm planning on building a stealth pc.
I found a 100w warm white cob and driver combo for super cheap so I bought it. I think I went a little overboard with the light so I also bought a 20k ohm potentiometer to dim it. How do I install it?
Thanks in advance.

 

[iampepe]

Install between the driver and the cob. Most potentiometers have 3 terminals, you'll use two.

 

[turtle soup]

Ok got ya thanks.

 

[turtle soup]

Would I be able to use one to control the speed of a pc fan?

 

[iampepe]

Would I be able to use one to control the speed of a pc fan?

You sure can.

 

[turtle soup]

Thanks again.

 

[L0wbob2017]

Ok so I'm planning on building a stealth pc.
I found a 100w warm white cob and driver combo for super cheap so I bought it. I think I went a little overboard with the light so I also bought a 20k ohm potentiometer to dim it. How do I install it?
Thanks in advance.

Install between the driver and the cob. Most potentiometers have 3 terminals, you'll use two.

Well for some potentiometers you have to take a look into the circuit.
Also a very important thing to keep in mind is that the size of the resistance of the potentiometer should be choosed depending on the voltage of the dimming channel.
For example, all meanwell HLG-C got 1-10V DC in their dimming channel which means u should use a 100k ohm poti, not a 50k or 20k ohm poti because this could lead to the driver not pumping up to full power!

Would I be able to use one to control the speed of a pc fan?

You sure can.

Take care of this, theoreticaly you can use a poti to control the speed of a 12V PC fan, but the problem is, the slower the fan should be the more power needs to be "wasted" on the resistance which means the resistance will get hot, maybe very hot to catching fire ( depends on the poti and the max current of your powersource ).

 

[turtle soup]

Well for some potentiometers you have to take a look into the circuit.
Also a very important thing to keep in mind is that the size of the resistance of the potentiometer should be choosed depending on the voltage of the dimming channel.
For example, all meanwell HLG-C got 1-10V DC in their dimming channel which means u should use a 100k ohm poti, not a 50k or 20k ohm poti because this could lead to the driver not pumping up to full power!





Take care of this, theoreticaly you can use a poti to control the speed of a 12V PC fan, but the problem is, the slower the fan should be the more power needs to be "wasted" on the resistance which means the resistance will get hot, maybe very hot to catching fire ( depends on the poti and the max current of your powersource ).

Thanks for your comment. I'm putting a 100w driver cob combo (super cheap price 12 bucks)in a pc case so I'm going to try it out and if it gets too hot or not bright enough I don't intend to crank it up to full strength. But I will test it out before install.
The driver shows nothing about a dimming channel does that matter?
I actually decided not to use it to control my exhaust fan I wouldn't want to accidently turn off my exhaust and create a fire. I'm just going to use the built in 3 level fan controller.
Thanks again.

 

[L0wbob2017]

Thanks for your comment. I'm putting a 100w driver cob combo (super cheap price 12 bucks)in a pc case so I'm going to try it out and if it gets too hot or not bright enough I don't intend to crank it up to full strength. But I will test it out before install.
The driver shows nothing about a dimming channel does that matter?
I actually decided not to use it to control my exhaust fan I wouldn't want to accidently turn off my exhaust and create a fire. I'm just going to use the built in 3 level fan controller.
Thanks again.

If your driver doesnt have any dimm option then it will be 0% or 100% and no way of changing that without creating heat. Also i am pretty sure that a 100W COB not dimmable will be waaaay too much for a PC case.
Also the heat the COB will generate needs to be moved away

 

[turtle soup]

Damn, I'm going to have to get a new light. And. Get. A 100k, they are only a few bucks.
Back to the drawing board.
Thanks again