Capacitance is a kind of we often use to electronic components, capacitor
is a kind of can store charge container.
It is made of two pieces of sheet metal, close to the middle separated by insulating material and composition.
According to the insulation material is different, can be made into all kinds of capacitor.
Capacitor structure classification of it is made of aluminum electrolytic capacitors inside the cylinder cathode, filled with liquid electrolyte, inserted a crooked ribbon do the anode is made.
Still need the dc voltage, do a layer of oxide film is formed on the piece of the anode for medium.
Characterized by large capacity, but the leakage, poor stability, have positive and negative polarity, suitable for power filtering or low frequency circuits, when using, don't answer the the positive and negative.
Tantalum niobium electrolytic capacitor which made the anode, metal tantalum and niobium with dilute sulphuric acid liquor, such as the cathode, generated by surface of tantalum and niobium oxide film do medium is made.
Its features are: small size, large capacity, stable performance, long service life.
The temperature performance is good, used in equipment in high demand.
Made from ceramic dielectric ceramic capacitor.
On the two sides spraying silver layer ceramic substrate, and then burned into silver plate made of thin film.
Its features are: small volume, good heat resistance, low dissipation, high insulation resistance, but the capacity is small, suitable for high frequency circuit.
Ferroelectric ceramic capacitance is larger, but loss and temperature coefficient is larger, suitable for low frequency circuits.
Mica capacitor with silver foil or spraying on the mica sheet do plate electrode layer, a layer of a layer plate and mica, die-casting in the bakelite powder or cementing in epoxy resin is made.
Its features are: small dielectric loss, insulation resistance.
The temperature coefficient is small, be applicable to the high frequency circuit.
Paper condenser with two pieces of metal foil electrodes, capacitance of the thin paper, rolled into a cylinder or flat cylindrical core, and then sealed in a metal casing or insulation shell.
It is characterized by small volume, capacity can be done.
But inherent inductance and the loss is bigger, is suitable for low frequency circuits.
Film capacitor structure in the same paper condenser, medium is polyester or polystyrene.
Polyester film capacitor, high dielectric constant, small volume, large capacity, good stability, suitable for the bypass capacitor.
Polystyrene film capacitor, the dielectric loss of small, high insulation resistance, but the temperature coefficient is big, can be used in high frequency circuit.
Metallized paper capacitor similar structure in paper capacitor, it is a layer of metal film on the capacitor paper after to generation of metal foil, small volume, large in capacity, commonly used for low frequency circuits.
In oil paper capacitor it is to put the paper in oil through special processing, can enhance its pressure.
Characterized by a large capacitance, high pressure, but the volume is bigger.
Capacitance symbols (1) is the basic capacitance symbols, such as ceramic capacitor mica capacitor film capacitor.
6 polar capacitor, electrolytic capacitor symbols, curved piece for the anode, the hollow to the anode.
7) for adjustable capacitance symbols, symbols for fine-tuning capacitance.
It is important to note that the electrolytic capacitor has positive and negative, +, - emblem on circuit diagram
And the other capacitor are -
is frequently used by people in daily life since it can improve dual start capacitor and ac start capacitor.
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