Variable Trimmer Capacitors
Variable trimmer capacitors are types of adjustable capacitors(devices that store electrical charge in circuits) where the capacitor capacitance (its ability to store an electrical charge) can be readily adjusted. They're often used in LC circuits (circuits that have an inductor and a capacitor) to set the frequency, for example, to tune a radio.
RS offer a range of high-quality ceramic and PTFE dielectric trimmer capacitors from industry-leading brands including Murata, Vishay and of course RS PRO.
How do variable trimmer capacitors work?
Trimmer capacitors are used to initially set oscillator frequency values, rise and fall times and other variables in a circuit. Should the values drift over time, trimmer capacitors allow you to re-calibrate your equipment.
Variable trimmer capacitors are almost always mounted directly on a PCB (printed circuit board) and set by using a small screwdriver. Variable trimmer capacitors are usually cheaper than full-sized variable capacitors.
What is a variable trimmer capacitor used for?
Common applications include oscillators, tuners, crystal oscillators and filters. Trimmer capacitors can also be found in communication equipment such as mobile radios and aerospace transmitters. Trimmer capacitors are available in SMD or through-hole mounting types and come in a range of voltages and capacitive ranges.
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- Murata Variable Trimmer Capacitor 30 → 60pF 50V ac
- RS PRO Variable Trimmer Capacitor 2.5 → 7pF 100V Ceramic
- RS PRO Variable Trimmer Capacitor 6 → 30pF 100V Ceramic
- Vishay Variable Trimmer Capacitor 7 → 100pF 200V dc PTFE
- RS PRO Variable Trimmer Capacitor 3 → 10pF 100V Ceramic
- Murata Variable Trimmer Capacitor 45 → 90pF 50V ac
- Vishay Variable Trimmer Capacitor 5.0 → 60pF 250V dc PTFE
- RS PRO Variable Trimmer Capacitor 10 → 50pF 100V Ceramic