Mini trim pot to big potentiometer
I tried to wire in a big potentiometer in place of the mini trim pot that came with my heater , the trim pot looked to me like it only used 2 out of the three legs , so I wired in the big potentiom...
Forum Discussion
The outside 2 pins are just the ends of a resistor. The center pin selects a point along that resistor depending upon where the pot is turned. The “ends” on the trim pot are the 2 pins on the same edge and the 3rd pin is the center.
It doesn’t matter which “end” you use along with the center other than the direction you twist to increase or decrease will be reversed in one case if all you need is a variable resistor. However often times one end is ground, the other is power and the center tap selects something in between so all 3 pins may be needed.
When you selected a large pot, did you get one of the same value as the small trim one? Did you de-solder and connect wires where the small one was? If so, just connect all 3 pins where the original was.
It doesn’t matter which “end” you use along with the center other than the direction you twist to increase or decrease will be reversed in one case if all you need is a variable resistor. However often times one end is ground, the other is power and the center tap selects something in between so all 3 pins may be needed.
When you selected a large pot, did you get one of the same value as the small trim one? Did you de-solder and connect wires where the small one was? If so, just connect all 3 pins where the original was.
