We often see the concept of teardrops, but many people express that they do not understand the meaning of this term and do not know how to add teardrops in PCB design. Please read on with this question in mind. Function of Teardrops ● Avoid the disconnection of contact points between wires and pads or … Read more
The circuit board cannot do without power chips. We generally use a large capacitor (100μF to 1000μF) and a small capacitor (0.1μF or 0.01μF) as the power filtering capacitors.The large capacitor is used to filter out low-frequency noise, while the small capacitor is used to filter out high-frequency noise.You have designed so many circuit boards; … Read more
1. The calculation method is as follows: First, calculate the cross-sectional area of the track. Most PCB copper foil thickness is 35um (if unsure, you can ask the PCB manufacturer; 1 ounce is 35um, but it is often less than 35um). The cross-sectional area is obtained by multiplying the trace width by the thickness, and … Read more
Definition of PCB Layers: Solder mask layer: solder mask, refers to the part of the board where green oil is applied; since it is a negative output, the part with solder mask actually does not have green oil but is plated with tin, appearing silver-white! Paste mask layer: paste mask, is used during machine placement, … Read more
The motor driver IC transmits a large amount of current while also dissipating a significant amount of electrical energy. Typically, the energy is dissipated into the copper areas of the printed circuit board (PCB). To ensure sufficient cooling of the PCB, special PCB design techniques must be employed. In this first part of the article, … Read more
As electronic products continue to miniaturize, the heat dissipation requirements of these systems have increased as more functions are packed into smaller devices. This is especially true for PCBs operating under high current. Particularly, power systems with heavy loads, such as lithium-ion batteries used in electric vehicles, require integrated power management systems on the PCB. … Read more
In working circuit boards, there are many components that generate significant heat, such as MOSFETs, LEDs, and transistors, especially under full load conditions. Heat dissipation vias are a well-known method for dissipating heat through surface-mounted components on circuit boards. Structurally, a via is drilled into the board, and if the board is a single-layer or … Read more
To properly place SMT components, the PCB must remain completely flat. For accurate placement, the pick-and-place machine must release the SMT components at the same height above the circuit board for all components. If the PCB is warped, meaning it is not flat, the machine cannot maintain a constant height when placing components on the … Read more
Rx is a resistor, there are many resistors in the circuit diagram, numbered sequentially, R1, R2… Cx is a non-polar capacitor, anti-interference capacitor at the power input terminal. IC is an integrated circuit module. Ux is an IC (integrated circuit component). Tx is a test point (for factory testing). Spk1 is a Speaker (buzzer, horn). … Read more
Click the blue text above to follow PCB knowledge As we all know, there are many silkscreen letters on PCB boards, such as R107, D202, C118, etc. There are also many other dense combinations of letters that may leave beginners feeling confused. However, excellent electronic engineers can instantly recognize what these letters represent. If you … Read more