]怎样看电路图).doc

］怎样看电路图)
A circuit diagram is like an article. All kinds of unit circuits are like sentences, and all kinds of component we still use them as resistors. The fourth special resistor symbols represent the emerging safety resistors, both of which play the role of resistors and fuses. When the temperature is more than 500 degrees, the resistance layer rapidly spalling, fuse, cut off the circuit, can play the role of protective circuit. Its resistance is very small, and it is used very much in color TV now. Its graphical symbols are shown in Figure 1 (1), and the text symbol is "R F"”.
Symbols for capacitors
As shown in Figure 2, which (a) represents a fixed capacity capacitor (b) indicating a polarity capacitor, such as various electrolytic capacitors (c), indicating variable capacity capacitors, (d) represents a trimmer capacitor (E) that represents a duplex variable capacitor. The text symbol for the capacitor is C.
The figure of an inductance coil in a circuit diagram is shown in figure 3. Which (a) is a general symbol of inductance coil, coil with magnetic core is (b) or (c) is the core, coil core gap, (d) with adjustable core adjustable inductor, inductance coil (E) is multiple tap. The literal symbol for the inductance
• 1 • 〃t 〃 〃
coil is L .
The graphical symbols for transformers are shown in figure 4. Among them, (a) is an air core transformer, and (b) is a core or