Variable trimmer capacitors are types of capacitors(devices which store electrical charge in circuits) where the capacitor capacitance (its ability to store 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.
How do variable trimmer capacitors work?
Variable 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, variable 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 are variable trimmer capacitor used for?
Common applications include oscillators, tuners, crystal oscillators and filters. Variable trimmer capacitors can also be found in communication equipment such as mobile radios and aerospace transmitters.
Description:
Long life low ESR aluminium electrolytic capacitors incorporating
a safety vent and insulating sleeve. Additional PCB pins are intended for mechanical connection only. It is recommended that they be soldered to the printed circuit board on isolated pads.
Description:
The B41456 series of aluminium capacitors from EPCOS
has a charge-discharge proof construction with screw terminals. Reliable electrical contact is ensured by an all welded construction and these aluminium capacitors offer high ripple current capability and high reliability. Aluminium case ...
Description:
The HE series of electrolytic capacitors from Nichicon
offer a low impedance, high reliability, miniature solution. These compact electrolytic capacitors are constructed from a PET (non-PVC) sleeve with lead-free plating on the leads.
Description:
Bipolar aluminium electrolytic capacitor. Ideal for use where
polarity is not fixed or indeterminate, such as exchange transmitters, loudspeaker crossover networks and motor shifters. Operating temperature range -55 to +105°CCapacitance tolerance: ±20%Leakage current: l = 0.01 CV or 3 μA ...