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Finishing off build. Which potentiometers ?

Posted: Wed Dec 19, 2018 1:24 pm
by DubJ
I’m just finishing off my builds and I’m looking for 3 100k ohm potentiometers. I don’t want to blind order and get 100ks that read 80k and have to put in a resistor. Can anyone lead me to some TRUE 100k ohm pots ?

Thanks

Re: Finishing off build. Which potentiometers ?

Posted: Wed Dec 19, 2018 4:21 pm
by Professor Xavier
I bought a pack of 10 uxcell 100k pots on amazon for 10 bux. Whoops.
Only 3/10 hit 100k.
Thank goodness I knew to test them from LEDG and Growmau5 vids.
My next pot from rapidled will cost me 6 dollars and save me a lot of problems as it has a chip in it to regulate and dispense with this nonsense.
If you think aboot it in terms of efficiency, saving 5 dollars for a cheap pot could cost you hundreds or thousands of dollars from the lost potential photon productivity over the years.
That's an opportunity cost I'd rather not pay.

Re: Finishing off build. Which potentiometers ?

Posted: Thu Dec 20, 2018 2:49 am
by Hydrofood
It’s all about the tolerance.
Every pot has a margin of error. There’s no true 100k pot.
Buy the rapidLED pot like professor said.
Or just get on Digi-Key, find a pot with 5% tolerance, and buy a few of them.
That’s what I did and only one was under 100K.
You should always get a few extra anyway. They are super cheap.