Hello everyone, it's time for daily learning again. Today we're going to talk about how to understand circuit schematics. Electrical appliance repair and circuit design all require analyzing circuit schematics and understanding the functions and working principles of electrical appliances in order to carry out work with ease. As a comrade engaged in this work, you must first have solid basic skills, be able to have a general understanding of circuit schematics with technical parameters, be able to divide functional modules, find out the signal flow direction, and determine the function of components. If you don't know the function of the circuit, you can first analyze the relationship between the input and output signals of the circuit. For example, the law of signal changes and the relationship between them, the phase problem is the same phase, or the opposite phase. The circuit and the composition form, is it an amplifier circuit, an oscillation circuit, a pulse circuit, or a demodulation circuit. To learn how to repair electrical equipment and design circuits, you must be proficient in the principles of each unit circuit. Be able to divide functional blocks, be able to group the components of the whole circuit according to different functions, and let each functional block form a component combination with a specific function, such as basic amplifier circuits, switch circuits, waveform conversion circuits, etc. You must master several methods for analyzing commonly used circuits and be familiar with the circuit types and analysis steps suitable for each method. 1. The AC equivalent circuit analysis method first draws the AC equivalent circuit, and then analyzes the AC state of the circuit, that is, when the circuit has a signal input, whether the voltage and current of each link in the circuit change according to the law of the input signal, whether it is amplified, oscillated, or limited, clipped, shaped, phase-detected, etc. 2. The DC equivalent circuit analysis method draws the DC equivalent circuit diagram, analyzes the DC system parameters of the circuit, and finds out the static operating point and bias properties of the transistor, the inter-stage coupling mode, etc. Analyze the state and role of the relevant components in the circuit. For example: the working state of the triode, such as saturation, amplification, and cut-off region, the diode is in conduction or cut-off, etc. 3. The frequency characteristic analysis method mainly looks at whether the frequency of the circuit itself is compatible with the spectrum of the signal it processes. Roughly estimate its center frequency, upper and lower limit frequencies, and bandwidth, such as various filtering, notching, resonance, frequency selection, etc. 4. The time constant analysis method mainly analyzes the circuit and properties composed of R, L, C and diodes. The time constant is a parameter that reflects the speed of energy accumulation and consumption on the energy storage element. If the time constant is different, although its form and connection method are similar, the role it plays is still different. Common ones include coupling circuits, differential circuits, integral circuits, decoupling circuits, peak detection circuits, etc. Finally, compare the actual circuit with the basic principle, and analyze it step by step according to the role of the components in the circuit according to the above method, and it will not be difficult to understand. Of course, to truly master it, you still need to study persistently. The following is the shared information, I hope it will be of some help to everyone's study, come on, everyone!
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