What does a variable capacitor do?

Variable capacitors are often used in L/C circuits to set the resonance frequency, e.g. to tune a radio (therefore it is sometimes called a tuning capacitor or tuning condenser), or as a variable reactance, e.g. for impedance matching in antenna tuners.

What is difference between a variable and fix capacitors?

Fixed capacitors have set capacitances because the parallel sheets of metal are at a fixed distance apart, while variable capacitors have the ability to change based on manipulation of the parallel plates.

What are the examples of variable capacitor?

Types of Variable Capacitors

• Tuning Capacitors.
• Trimmer Capacitors.
• Mechanical Capacitors.
• Electronic Capacitors.

What are the two types of variable capacitor?

There are many uses of these variable resistors such as for tuning in LC circuits of radio receivers, for impedance matching in antennas etc. The main types of variable capacitors are Tuning capacitors and Trimmer capacitors.

Where is the common application for variable capacitor?

Variable air capacitors are used in circumstances where the capacitance needs to be varied. They are sometimes used in resonant circuits, such as radio tuners, frequency mixers or antenna impedance matching applications. Another use for variable capacitors is while prototyping an electronic circuit design.

How is a variable capacitor made?

Variable air capacitors are used more often because of their simple construction. They are usually made of two sets of semicircular metal plates separated by air gaps. One set is fixed and the other is attached to a shaft which allows the user to rotate the assembly, therefore changing the capacitance as needed.

Are variable capacitors polarized?

Variable Capacitor Symbol These are generally small devices that can be adjusted or “pre-set” to a particular capacitance value with the aid of a small screwdriver and are available in very small capacitance’s of 500pF or less and are non-polarized.

What do variable capacitors use for dielectric?

Variable capacitors are designed according to the same principles used for standard capacitor production, with sets of conductive plates arranged in a parallel sequence and separated with dielectric layers composed of materials such as mica, reinforced paper, or certain types of ceramics.

How is capacitor used in tuning circuits?

Tuning A Radio Receiver Variable capacitors are used with inductor coils in tuning circuits of radios, television sets, and a number of other devices that must isolate electromagnetic radiation of selected frequencies. In the circuit below, a variable capacitor is connected to a simple antenna transformer circuit.

What is the advantages of mica capacitor?

The mica capacitors have the advantages of wide voltage range, high reliability, stable performance and high capacity accuracy. Especially suitable for high-frequency oscillation circuit, high-precision operational amplifier, filter circuit and other occasions.

What is a variable capacitor?

Variable capacitors in general consists of interwoven sets of metallic plates in which one is fixed and the other is variable. These capacitors provide the capacitance values so as to vary between 10 to 500pF.

What type of capacitors are used in potentiometric circuits?

the stator-to-stator capacitance constant. Differential variable capacitors can therefore be used in capacitive potentiometric circuits. A vacuum variable capacitor uses a set of plates made from concentric cylinders that can be slid in or out of an opposing set of cylinders (sleeve and plunger).

What is a single Section 365 PF variable capacitor?

Submit your own product image! Single section 365 pf variable capacitor, also referred to as a tuning capacitor. Single section 365 pf variable capacitor. A compact, rugged, economical unit used in wide variety of low-voltage applications.

What is capacitor connection?

If a set of capacitors were connected in a circuit, the type of capacitor connection deals with the voltage and current values in that network. Let us observe what happens, when few Capacitors are connected in Series.