When an electrician uses a digital multimeter, according to the function of the capacitance in the circuit, the basic function of the capacitor is charging and discharging, but many circuit phenomena extended from this basic charging and discharging function make the capacitor have various uses, such as in electric motors In electronic circuits, electricians use it to produce phase shifts; in photographic flashlights, use it to generate high-energy instantaneous discharges, etc.; and in electronic circuits, capacitors of different properties are used in many different ways. The difference, but because of its function all comes from charging and discharging. Here's what some capacitors do:
Coupling capacitor function: The capacitor used in the coupling circuit is called a coupling capacitor. This kind of capacitor circuit is widely used in the resistance-capacitance coupling amplifier and other capacitive coupling circuits to block DC and AC.
The function of the decoupling capacitor. The capacitor used in the decoupling circuit is called the decoupling capacitor. This capacitor circuit is used in the DC voltage supply circuit of the multi-stage amplifier. The decoupling capacitor eliminates the harmful low-frequency cross-connection between the amplifiers of each stage. .
The function of the high-frequency vibration elimination capacitor: the capacitor used in the high-frequency vibration elimination circuit is called a high-frequency vibration elimination capacitor. In the audio negative feedback amplifier, in order to eliminate the high-frequency self-excitation that may occur, this capacitor circuit is used. In order to eliminate the possible high frequency howling of the amplifier.
Function of neutralization capacitor: The capacitor used in the neutralization circuit is called neutralization capacitor. In radio high-frequency and intermediate frequency amplifiers, and TV high-frequency amplifiers, this neutralization capacitor circuit is used to eliminate self-excitation.
Compensation capacitor function: The capacitor used in the compensation circuit is called compensation capacitor. In the bass compensation circuit of the deck, this low-frequency compensation capacitor circuit is used to enhance the low-frequency signal in the playback signal. In addition, there are high-frequency compensation capacitor circuit.
The function of the bootstrap capacitor: The capacitor used in the bootstrap circuit is called a bootstrap capacitor. The commonly used OTL power amplifier output stage circuit uses this bootstrap capacitor circuit to slightly increase the positive half-cycle amplitude of the signal through positive feedback.
The function of load capacitance: it refers to the effective external capacitance that determines the load resonance frequency together with the quartz crystal resonator. Commonly used standard values for load capacitance are 16pF, 20pF, 30pF, 50pF, and 100pF. The load capacitance can be adjusted appropriately according to the specific situation. Generally, the operating frequency of the resonator can be adjusted to the nominal value through adjustment. There are many functions of capacitance in digital multimeters, mainly to see what objects most need to be measured when electricians use digital multimeters.
