The so-called capacitor is an electronic component that holds and releases electric charge. The basic working principle of capacitors is charging and discharging, and of course rectification, oscillation and other functions. In addition, the structure of the capacitor is very simple, mainly composed of two positive and negative electrodes and an insulating medium sandwiched in the middle, so the type of capacitor is mainly determined by the electrodes and the insulating medium. There are many uses of capacitors, mainly as follows:

1. Blocking DC: The function is to prevent DC from passing through and allow AC to pass.

2. Bypass (Decoupling): Provides a low impedance path for certain parallel components in an AC circuit.

3. Coupling: As a connection between two circuits, allowing an AC signal to pass through and be transmitted to the next stage of electricity

4. Filtering: This is very important for DIY, and the capacitors on the graphics card are basically the same.

5. Temperature compensation: Compensate for the influence of other components' insufficient adaptability to temperature to improve the stability of the circuit.

6. Timing: Capacitors are used in conjunction with resistors to determine the time constant of a circuit.

7. Tuning: System tuning of frequency-dependent circuits, such as cell phones, radios, and televisions.

8. Rectification: Turning on or off a semiconductor switching element at a predetermined time.

9. Energy Storage: Stores electrical energy and releases it when necessary. Such as camera flashes, heating equipment, etc. (Today, the energy storage level of some capacitors is close to the level of lithium batteries, and the energy stored in a capacitor can be used for a day for a mobile phone.