Various capacitor applications

Author:

No polarity variable capacitor
Production process: the rotatable moving piece is a ceramic film plated with metal film on the surface, and the fixed piece is a ceramic bottom plated with metal film; The moving piece is a coaxial metal sheet, and the fixed piece is an organic film sheet as the medium
Advantages: easy to produce, low technical content.
Disadvantages: large volume, small capacity
Application: Change oscillation and resonant frequency circuit. FM, amplitude modulation, transmit/receive circuits

Non-polar non-inductive CBB capacitors
Production process: 2 layers of polypropylene plastic and 2 layers of metal foil alternately mixed and then bundled.
Advantages: no induction, good high frequency characteristics, small size
Disadvantages: not suitable for large capacity, relatively high price, poor heat resistance.
Uses: coupling/oscillation, audio, analog/digital circuits, high-frequency power filtering/decoupling

Non-polar CBB capacitors
Production process: 2 layers of polyethylene plastic and 2 layers of metal foil alternately mixed and then bundled.
Advantages: sensing, good high frequency characteristics, small size
Disadvantages: not suitable for large capacity, relatively high price, poor heat resistance.
Uses: coupling/oscillation, analog/digital circuits, power supply filtering/decoupling

Non-polar ceramic capacitors
Production process: thin porcelain sheet made of metal film silver on both sides.
Advantages: small size, high withstand voltage, low price, high frequency (there is a high-frequency capacitor)
Disadvantages: fragile, low capacity
Uses: high-frequency oscillation, resonance, decoupling, audio

Non-polar mica capacitors
Production process: mica sheet plated with two layers of metal film
Advantages: easy to produce, low technical content.
Disadvantages: large size, small capacity Uses: oscillation, resonance, decoupling and low requirements of circuit non-polar monolithic capacitor volume is smaller than CBB, other CBB, sensing
Uses: analog/digital circuit signal bypass/filtering, audio

There are polar electrolytic capacitors
Production process: two pieces of aluminum strip and two layers of insulating film are layered on top of each other, and then soaked in electrolyte after being bundled.
Advantages: large capacity.
Disadvantages: high frequency characteristics are not good.
Uses: low-frequency inter-stage coupling, bypass, decoupling, power filtering, audio

Tantalum capacitors
Production process: use metal tantalum as the positive electrode, and spray metal as the negative electrode outside the electrolyte.
Advantages: good stability, large capacity, good high frequency characteristics.
Disadvantages: high cost.
Uses: high-precision power filtering, signal inter-stage coupling, high-frequency circuit, audio circuit

Polyester (polyester) capacitors
Symbol: CL
Capacity: 40P--4U
Rated voltage: 63--630V
Main features: small volume, large capacity, heat and moisture resistance, poor stability
Application: Low-frequency circuits with low requirements for stability and loss

Polystyrene capacitors
Symbol: CB
Capacitance: 10P--1U
Rated voltage: 100V--30KV
Main features: stable, low loss, large volume
Application: Circuits with high requirements for stability and loss

Polypropylene capacitors
Symbol: CBB
Capacity: 1000P--10U
Rated voltage: 63--2000V
Main features: the performance is similar to polybenzene but small in size and slightly worse in stability
Application: Replaces most polybenzene or mica capacitors for demanding circuits

Mica capacitors
Symbol: CY
Capacity: 10P--0.1U
Rated voltage: 100V--7kV
Main features: high stability, high reliability, small temperature coefficient
Application: high-frequency oscillation, pulse and other circuits with high requirements

High frequency ceramic dielectric capacitors
Symbol: CC
Capacitance: 1--6800p
Rated voltage: 63--500V
Main features: low high frequency loss, good stability
Application: High frequency circuit

Low-frequency porcelain dielectric capacitors
Symbol: CT
Capacitance: 10P--4.7U
Rated voltage: 50V--100V
Main features: small size, low price, large loss, poor stability
Application: Low frequency circuits that are not very demanding

Glass glaze capacitors
Symbol: CI
Capacity: 10P--0.1U
Rated voltage: 63--400V
Main features: good stability, small loss, high temperature resistance (200 degrees)
Application: pulse, coupling, bypass and other circuits

Aluminum electrolytic capacitors
Symbol: CD
Capacitance: 0.47--10000U
Rated voltage: 6.3--450V
Main features: small size, large capacity, large loss, large leakage
Applications: power supply filtering, low frequency coupling, decoupling, bypass, etc

Tantalum electrolytic capacitors (CA), niobium electrolytic capacitors (CN)
Capacity: 0.1--1000u
Rated voltage: 6.3--125V
Main features: loss and leakage are less than aluminum electrolytic capacitors
Application: Replacing aluminum electrolytic capacitors in demanding circuits

Air dielectric variable capacitors
Variable capacitance: 100--1500p
Main features: small loss, high efficiency; It can be made into linear type, linear wavelength type, linear frequency type and logarithmic formula according to requirements
Application: electronic instruments, radio and television equipment, etc

Film dielectric variable capacitors
Variable capacitance: 15--550p
Main features: small size, light weight; The loss is greater than that of the air medium
Application: communication, broadcast receiver, etc

Film dielectric trimmer capacitors
Symbol: Variable capacitance: 1--29p
Main features: large loss, small size
Application: recorder, electronic instruments and other circuits for circuit compensation

Ceramic dielectric trimmer capacitors
Symbol: Variable capacitance: 0.3--22p
Main features: small loss, small size
Application: Precision-tuned high-frequency oscillation loop