A guide to trimmer capacitors

Updated: Apr 22, 2020

Trimmer capacitors are mechanically adjustable devices used to calibrate and recalibrate oscillator, timing and similar tuning circuits.

They are available in ceramic, plastic film, glass, quartz and sapphire dielectrics in a variety of configurations and mounting styles.

They are commonly used in RF/microwave communications equipment and, in non-magnetic versions, in medical scanning machines.

Manufacturers are Exxelia, Vishay, Johanson Manufacturing and Voltronics. The latter two brands are now part of the Knowles group.

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