Many characters are often printed on the circuit board. Let’s take a look at the meaning of common characters.
Rx is a resistor, and there are many resistors in the circuit diagram, ranked by number, R1, R2.
Cx is a non-polarized capacitor, and the power input capacitor is interference-free.
CEx: Electrolytic Capacitor
CY: (Y capacitor: high voltage ceramic capacitor, safety regulations)
IC: integrated circuit module
Ux: Integrated Circuit Element
Tx: the test point (factory test)
Spk: Speaker (buzzer, horn)
CONx: connector
Dx: Diode
Lx: inductor/bead
LEDx: Light Emitting Diodes
Xx: crystal oscillator
RTH: Thermistor
SW: Switch
The meaning of the characters on the PCB
Written By：Syspcb
Updated: 2025-4-1
