Circuit board area is limited, in order to achieve better function and convenient maintenance, electronic components are usually in the form of alphanumeric code. In order to standardize electronic circuits and facilitate use, in general: the meaning of letter codes and numerical sequencing are certain rules.
A simple example:
R1, where R represents resistor, 1-1 resistor.
R11, where R-resistor, 11-11 resistor.
In R111, where R-resistor, 1-function module, 11 represents the serial number of the similar component on this function module.
1. In general, the principle and sequence of reading of electronic circuit components.
Example: R118 ~ 18th resistor on motherboard circuit.
1. The first English letter or combination indicates the name of the component, which is the code of the component.
2. The first number represents the different modules on the circuit board.
Generally speaking: 1-motherboard circuit, 2-power supply circuit, 3-feedback circuit, etc., these can be the designer's own decision.
3. The following numbers represent the serial numbers of similar components on this functional module. That is: the 18th resistor and so on.
2. common electronic circuit component code.
R-resistor.
VR-Adjustable resistance.
C- Capacitor.
D-Diode.
ZD-Zener diode.
Q-Transistor or FET. e-emitter, B- base, c-collector.
LED-Light emitting diode.
T-transformer.
SW-Switch.
L-Inductance.
K-relay.
GND-common ground.
LS-Buzzer.
FS-Insurance.
RTH-Thermistor.
3. the connection of electronic circuits and macro power control circuits.
1. The electronic circuit is composed of miniature electronic components, which are connected by circuit boards.
Under normal circumstances, the electronic circuit as a whole will be divided into several parts: the power supply part, the rectifier bridge part, the filter part, the voltage regulator part, the amplification part, the vector output part and so on, and these parts are generally fixed mode, the general components, the general principle, to a certain extent can be universal.
2, the macro power control circuit.
It is generally composed of contactors, plc, switches, electrical equipment, etc. connected by wires. In the process of circuit control, it is generally divided into measurement circuit, power supply circuit, protection circuit, control circuit, output circuit, etc.
To a certain extent, electronic circuits and macro power control circuits can be transformed into each other to achieve the same purpose. Proficient in mastering the abbreviation code of electronic circuits and correct reading methods are the basis for learning and maintaining electronic circuits.
Of course, this is the general industry default rules, it is best to use multimeter and other equipment measurement, the measurement results shall prevail.