Read resistor codes and explore wiper position, taper and output loading.
Position runs from terminal a toward b; c is the wiper. The logarithmic teaching model has 10% of total resistance between a and c at 50% travel. A/B markings vary by manufacturer: check the datasheet. A connected load changes the output voltage.
How to use
- Enter a three-digit code such as 103, or clear it to enter resistance directly.
- Set the position, taper, supply voltage and optional load.
- Read a–c, c–b and output voltage; open the simulator and move the wiper.
Circuit model
Vout = Vin × (Rcb ∥ RL)/(Rac + (Rcb ∥ RL)); Rac + Rcb = R.