Trimmer Capacitor

trimmer capacitor

[′tim·ər kə‚pas·əd·ər]
(electricity)
A relatively small variable capacitor used in parallel with a larger variable or fixed capacitor to permit exact adjustment of the capacitance of the parallel combination.

Trimmer Capacitor

 

in radio engineering, a capacitor with a low variable capacitance that can be set at a certain value. Trimmer capacitors are used mainly to effect the alignment of resonant oscillatory circuits. As a rule, the capacitance of a trimmer capacitor is set during the fabrication of a radio-electronic device. After such setting, the movable parts of the trimmer capacitor are locked in place and remain in their fixed positions while the device is operating. A trimmer capacitor is generally a simplified parallel-plate variable capacitor with one stator plate and one rotor plate; less frequently, it may be, for example, a system consisting of two or more concentric ceramic cylinders or metal plates with an air gap or a system consisting of a rod and a metal-plated ceramic tube. The capacitance of a trimmer capacitor and the range in which the capacitance may be varied usually amount to several picofarads or several tens of picofarads.

References in periodicals archive ?
The unit's positive piston travel stops at minimum and maximum settings, ensuring the piston cannot exit the trimmer capacitor body as it can in conventional air-dielectric rotating piston-type trimmer capacitors.
Suited for telecom and microwave projects, the SGC3S Series ceramic trimmer capacitors measure 0.126" (3.2 mm) X 0.177" (4.50 mm) X 0.059" (1.5 mm).
Also, it does not require the peripheral components commonly found with piezoelectric devices such as lead wires, booster coils, or trimmer capacitors.
A new series of Gigahertz trimmer capacitors that are reduced in size while improving effective series resistance and self-resonant frequency performance was on display by Temex Components.
Sprague-Goodman's low profile surface mount FILMTRIM[R] plastic dielectric trimmer capacitors are available in nonmagnetic versions.
Models in the GKRP Series of miniature, low-profile surface-mount trimmer capacitors measure 3.2 x 2.5 mm.
The model GKP6R066 SURFTRIM[R] surface-mount trimmer capacitors features an extremely thin profile and capacitance range of 2.5 to 6.0 pF with drift after setting of [less than] [+ or -]1 percent.
A series of miniature, low profile SMT trimmer capacitors has been added to the Sprague Goodman Surftrim[R] line.
The A4 series precision trimmer capacitors features a patented solid dielectric design that eliminates the possibility of intermittent shorting and microphonics.
Sprague-Goodman has added a series of SMT devices to its line of FILMTRIM[R] plastic dielectric trimmer capacitors. Suitable for RF circuitry, telecommunication, CATV and broadband, this series offers four capacitance ranges from 0.5 pF - 4.5 pF to 1 pF to 20 pF.