do different trim pots have different sensitivity?

[kninja]

So I recently bought an LM317 based regulator kit to use as part of a cheap variable power supply (combined with switchable DC power supply), **broken link removed** is the specific kit.

I'm having trouble in that I cannot get the voltage to be exactly 3v, the sensitivity / resolution on the trim pot is not fine enough, it jumps from ~2.2v to ~3.6v with the smallest adjustment i can make. So I'm wondering, can i replace the trimpot with a different one to get a more fine grained control?

 

[Sink0]

Are you sure about that, have any ideal how may turns your trimpot is? You can change it for sure, but you probably going to have some footprint mismatch problem. Did you test it under some load? As far as i remember LM317 needs some minimum current to work, but i might be wrong.

Cya

 

[kninja]

Yeah i played with it for like half an hour... the pot only makes about a 3/4 turn from min to max...

Just tested it with a multimeter, should i try hooking it up to the circuit?

 

[franciscorc]

Hi
Yes you can replace the trimpot for a multi turn type with the
same resistance value.If you can not read the value of the trimpot , take it out
and measure the value with your multimeter.

Best

 

[Sink0]

Yea, try using a 500R to 1k Resistor It should be enough.