Well, I need a 100k pot for my mid-boost module (or whatever the reason !). Hey, I found 2 pots in my box. Let see : are they log or lin ?
For sure, they have a code : 100k A for one and 100k B for the other.
Well, well … are these code related to US, Europe, Japan pot ? Are they “old” code or “new” code ? Where the hell is the log pot ?
Most pots have 270 degrees of rotation from one extreme to the other (3/4 turn).
Here are how log and lin pots react (resistance change) when we turn (example of a 100k pot as Y axis, where X axis represents the rotation in degrees)
First, let’s use a marker …
Take the first pot and measure the resistance :
Then rotate to mid-position and measure again.
Here is the result for a lin pot :
And here is the result for a log pot :
These results are consistent with the curves … I know now which pot is log and which is lin !
Hope this helps …