Digital potentiometers are being rapidly promoted at home and abroad, and are used in a large number of testing instruments, PCs, cell phones, home appliances, modern office equipment, industrial control, medical equipment and other fields. For example: refrigerator, programmable control machine, power supply, power meter, automatic testing equipment, fiber optic network, adjusting LCD display, voltage control, replacing mechanical potentiometers, matching linear impedance, adjusting VCOM settings.