Busted Multi-turn Pot on boost converter

[KingPanzerVIII]

I recently bought a 600w boost converter for use with some fans I needed speed control on. Turns out, one of the multi-turn potentiometers had bent and had a lead torn off the board, and the other one was stuck at an output of 13.84 volts. Is there any danger with replacing these with some of my 2-turn 10K pots?

PS. If this is posted in the wrong spot, sorry. I just logged in to ask this.

[Bratster]

What's the value of the multi turn pot that's in there?

As long as you use one that has the same value there's no problem if it's a different amount of turns, it will just affect how accurate you can set it.

and depending on how it is used in the circuit you may even be able to use a slightly different value, but you would actually need to know how it's being used to determine that

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[KingPanzerVIII]

How would i go about reading the value on the Trimpot? There's a whole jumble of numbers and i only have experience with single and dual turn pots.

[DaJMasta]

Multiturn work the same way, it just takes more turns to go between the maximum and minimum value (if a single turn pot has a wiper on the adjustment shaft, a multiturn effectively has a gear reduction on the shaft and a bigger cog on the wiper), so the pinout and measurement will be consistent with single and dual turn potentiometers.  So as long as the center point matches and the taper is correct, a single or dual turn pot will work, but you won't have as fine control as with a multiturn, a single turn pot's finest adjustment (the smallest amount you can move it) is 1/10th of a 10 turn pot's same finest adjustment.

[Ian.M]

Alternatively, identify the controller or chopper chip and see what its datasheet has to say about the divider network to its feedback pin.

Are you sure you need a boost converter?  In most cases the fans are rated for the supply rail that feeds them, so without any controller run at full speed.   You then *REDUCE* the voltage with a *BUCK* converter, or if there is no tacho feedback, PWM them to reduce the average voltage.