Aluminum electrolytic capacitor Capacitor is one of the electronic components used in a large number of electronic equipment, widely used in circuit isolation through cross, coupling, bypass, filtering, tuning circuit, energy conversion, control and so on.
1. Ceramic capacitor: ceramic is used as dielectric. In the ceramic substrate on both sides of the sprayed silver layer, and then fired into a silver film for the pole plate made. Its characteristics are: small size, good heat resistance, low loss, high insulation resistance, but small capacity, suitable for high frequency circuits. The capacity of ferroelectric ceramic capacitor is larger, but the loss and temperature coefficient is larger, which is suitable for low frequency circuit. 2.
2. Aluminum electrolytic capacitor: It is made of aluminum cylinder as negative electrode, containing liquid electrolyte, and inserting a piece of bent aluminum tape as positive electrode. It also needs to be processed by DC voltage to form a layer of oxide film on the positive electrode to do dielectric. Its characteristics are large capacity, but leakage, poor stability, positive and negative polarity, suitable for power supply filtering or low frequency circuit, when using, positive and negative do not reverse.
3. mica capacitor: metal foil or mica sheet sprayed silver layer for electrode plate, pole plate and mica layer by layer laminated, and then die-cast in mica powder or sealed in epoxy resin made. Its characteristics are: small dielectric loss and large insulation resistance. Temperature coefficient is small, suitable for high frequency circuits.
4. paper dielectric capacitor: two pieces of metal foil as electrodes, sandwiched in a very thin capacitor paper, rolled into a cylindrical or flat column core, and then sealed in a metal or insulating material shell made. It is characterized by its small size and can be made into a large capacity. However, the inherent inductance and loss are relatively large, and it is suitable for low frequency circuits.
5. Tantalum-niobium electrolytic capacitor: it is made of metal tantalum or niobium as the positive electrode, with dilute sulfuric acid and other liquid to do the negative electrode, with tantalum or niobium surface generated by the oxide film made of medium. Its characteristics are: small size, large capacity, stable performance, long life. Large insulation resistance. Good temperature performance, used in the equipment with high requirements. 6.
6. film capacitor: the structure is the same as the paper capacitor, the medium is polyester or polystyrene. Polyester film capacitor, high dielectric constant, small volume, large capacity, good stability, suitable for bypass capacitor. Polystyrene film capacitor, small dielectric loss, high insulation resistance, but large temperature coefficient, can be used in high frequency circuit.
14D270K Епоксидна смола филм цинков оксид варистор

14D270K Епоксидна смола филм цинков оксид варистор

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