Potentiometer Page

[Professor Xavier]

Hopefully a few stickies can consolidate some knowledge on the topic.

[Professor Xavier]

I found these two videos helped me greatly:

[Professor Xavier]

Here is a cool post by SDFoster on a convo regarding POTS with Thompson Research drivers. All the credit goes to him for posting it; I thought it would be useful here.

I emailed Thomas research products about a month ago about dimming these drivers. They just emailed me back. Here is the answers they gave me.

First a chart.
image001.jpg

Here are my questions, and their answers. Their answers are in blue.

Screenshot_2018-06-25-13-15-15.png

Screenshot_2018-06-25-13-15-21.png

[Professor Xavier]

I think I messed up the pics in his post!

[infosponge]

If you use a pot that's higher than what you need, for example I can't find a 40k pot so if I used a 50k, would I still get 100% of the power output? Will I still get 75W from the driver?

[sdfoster22]

Yes. You will get 100% output at 75% turn of the dial.

[Futuregrow]

Just to expand on this potentiometer knowledge, pots tend to have two common marking code conventions to identify them by, as follows:

e.g. a 100kohm pot would either be known as B100K, or B104, both referring to the same thing. The B means linear taper, 100K means 100kohm, and 104 means 10ohm x 10^4

I found this information extremely useful when trying to find suitable potentiometers online.

Here's the article I found this information in:

http://www.resistorguide.com/potentiometer/

[Crusher]

Hi guys!
So this may be an stupid question, and i used the now the awnser.. but i has been a while since i was tinkering with leds.. and i cant find a clear awnser on the net..
So.. when im using an constant current driver lets say a Meanwell hlg-120h-1400b and im dimming it with an 10k potmeter.. what changes? Is it the current or the voltage when i turn on the knob that in or decreases?
The harder i think about it the more confused i get.. I would say voltage becuase the driver has a fixed current not?

[Shimbob]

Hi guys!
So this may be an stupid question, and i used the now the awnser.. but i has been a while since i was tinkering with leds.. and i cant find a clear awnser on the net..
So.. when im using an constant current driver lets say a Meanwell hlg-120h-1400b and im dimming it with an 10k potmeter.. what changes? Is it the current or the voltage when i turn on the knob that in or decreases?
The harder i think about it the more confused i get.. I would say voltage becuase the driver has a fixed current not?

The current gets dimmed. See the specs for that driver, page 4 under additive resistance.

On another note, did you really mean a 10k pot?