Electroless copper plating makes an insulating PCB hole wall conductive by depositing copper through a chemical reaction, without connecting the board to an external plating current. The thin deposit provides a base for subsequent copper electroplating. Reliable connections depend on continuous coverage of the resin, glass fibers and exposed inner-layer copper, not simply a copper-colored […]

A pencil hardness test checks how a cured solder mask resists damage from a prepared graphite pencil. A useful result identifies the pencil grade, test method and damage endpoint. A dark graphite line is not automatically a scratch, and a hard surface does not prove that the coating is firmly bonded to the PCB. What […]

The 1k resistor color code is brown–black–red–gold for a common four-band resistor with ±5% tolerance. A five-band version with ±1% tolerance uses brown–black–black–brown–brown. Both represent 1,000 Ω, also written as 1 kΩ or 1k0. Surface-mount versions may carry the marking 102 or 1001, while smaller packages may be unmarked. Once you identify the value, check […]

Face ID and fingerprint sensors make unlocking your phone quick and convenient. You might also use biometrics to approve purchases, access banking apps, or sign in to accounts. So, when your phone suddenly stops recognizing your face or fingerprint, the problem can disrupt more than your lock screen. Sometimes, a simple setting or dirty sensor […]

The five-day exhibition has successfully concluded for EBest Circuit at Canton Fair 2026 Autumn. From October 15 to 19, 2026, our team welcomed visitors at Booth 16.3H18 in Area C of the China Import and Export Fair Complex in Guangzhou. This year, our exhibition focused on PCB assembly (PCBA), giving customers a closer look at […]

IPC 620 is the commonly used name for IPC/WHMA-A-620, the requirements and acceptance standard for cable and wire harness assemblies. It addresses workmanship in wire preparation, crimped and soldered connections, connector assembly, and associated inspection and testing. For a production order, the useful reference is not simply “IPC compliant”: it is the agreed revision, product […]

A Yagi PCB antenna uses printed conductive elements to concentrate RF energy in a specific direction. Its performance depends on element dimensions, PCB materials, feed structure, and impedance matching. Small changes in these factors can shift the resonant frequency, reduce gain, or distort the radiation pattern. For a 2.4 GHz Yagi PCB antenna, good impedance […]

1080 Glass Cloth is a lightweight, plain-woven glass reinforcement used in electronic laminates and PCB prepregs. Published supplier examples weigh about 47–49 g/m², with dry-fabric thickness around 0.05–0.06 mm. Its thin construction helps engineers build closely spaced copper layers without using a heavier glass fabric. However, a PCB does not use the dry-cloth dimension as […]

Soldering wires to PCB pads or plated holes requires a clean, wetted joint and support that keeps cable movement away from the connection. The method changes with the connection point: a wire laid onto a surface pad needs different positioning from one inserted through a plated hole. In either case, adding more solder cannot compensate […]

A pump controller PCB receives operating signals and controls when a water pump starts, stops, or changes speed. Its role depends on the system: a tank-filling controller responds to water level, a pressure booster responds to demand, and a variable-speed pump may need a power stage as well as control logic. These boards share a […]