3) The center tap of the potentiometer slides between 0-10k for a total of 100 (the typical impedance of the potentiometer sliding end is 40 ohms) Instructions for use:1) Wide voltage (3V-5V) power supply. The chip is X9C103S; PCB board size: 2.7x1.3CM 4) The digital potentiometer VL and ports correspond to the low and high end of the sliding rheostat, respectively, allowing the input voltage range from -5V to +5V. 2) 10K full-scale potentiometer. 5) The digital potentiometer module is accompanied by a test program. The program code is C language code and is written in sub-modules. The code includes: main function, display sub-function, button sub-function and header file of each module. You can use KEIL4 to open code for testing and learning., Weight: 0.01763698096 pounds, Manufacturer: Rfeeuubft