Trimmer Potentiometers FAQ

Configurations/Material

What are the differences between a Carbon resistive element and a Cermet resistive element?

A carbon resistive element is made using carbon as the conductive component, and resin as the binder. It is inexpensive, but because it uses resin as the binder, variations of the resistance value due to heat and humidity are kind of big.

A cermet resistive element is made using ruthenium oxide-based metallic particles as the conductive component, and glass as the binder. It is expensive, but because it uses a glass binder, variations of the resistance value due to heat and humidity are small.

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