On the PCB board, there are many silk screen letters, such as R107, C118, Q102, D202, etc. Do you know what these letters mean? In fact, the letters on the PCB board represent the abbreviation of electronic components. The letters are often followed by numbers, and these numbers also have meanings.

The meaning of some letters on the PCB board

B: Buzzer

C: Capacitor

D: Diode

F: fuse

J：Jumper

L: Inductor

Q: Transistor

R: resistor

RT: thermistor

T: Transformer

U: chip, integrated circuit (IC)

W: Voltage regulator tube

Y: crystal oscillator

R107, C118, Q102, D202 and other numbers are often seen on circuit boards. Generally, the first letter identifies the device category, such as R representing a resistor, C representing a capacitor, D representing a diode, Q representing a transistor, etc.; the second letter It is a number, indicating the circuit function number, such as "1" indicating the mainboard circuit, "2" indicating the power circuit, etc. This is determined by the circuit designer; the third and fourth digits indicate the device is a similar device on the circuit board serial number.

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