Component description of PCBA patch processing.pdf
- 1. Component description of PCBA patch processing PCBA patch processing mainly includes two major processes: PCB circuit board production and SMT patch processing. Electronic components are indispensable in the process. Electronic components are the basic part of PCBA patch processing and an important factor affecting the performance and quality of PCBA finished products. So what are the commonly used electronic components for PCBA patch processing? 1. Resistor Resistors are electronic components with resistance characteristics and are one of the most widely used components in PCBA processing. Resistors are divided into fixed resistors and variable resistors (potentiometers), which play the role of voltage division, current division and current limiting in the circuit. 2. Capacitors Capacitors are also one of the basic components in PCBA processing. They are components that store electrical energy and play the role of coupling, filtering, DC isolation and tuning in electronic circuits. 3. Inductor coils Inductor coils are referred to as inductors and have the function of storing magnetic energy. Inductor coils are usually composed of skeletons, windings, shielding covers, magnetic cores, etc. 4. Potentiometers Resistors with variable resistance values, that is, resistors that can be continuously adjusted within a specified range, are called potentiometers. The potentiometer consists of a housing, a sliding end, a rotating shaft, a ring resistor and three lead-out terminals. 5. Transformer The transformer consists of an iron core (or magnetic core) and a coil. The coil has two or more windings, of which the winding connected to the power supply is called the primary coil, and the remaining windings are called the secondary coil. The transformer is a device that converts voltage, current and impedance. When an AC current flows through the primary coil, an AC magnetic flux is generated in the iron core (or magnetic core), causing a voltage (or current) to be induced in the secondary coil. The transformer is mainly used for AC voltage conversion, current conversion, power transmission, impedance conversion and buffer isolation, etc. It is one of the indispensable important components in the PCBA machine. 6. Crystal diode The crystal diode (i.e. semiconductor diode, hereinafter referred to as diode) is made of a PN junction, electrode leads and an external sealed tube shell, and it has a unidirectional conductive characteristic.
- 2. 7. Crystal triode The crystal triode (hereinafter referred to as triode) is the core device for signal amplification and processing, and is widely used in PCBA machines. 8. Field Effect Transistor Field effect transistor (FET for short) is also a semiconductor device with PN junction. Unlike triode, it does not use the conductive property of PN junction, but its insulating property. 9. Electroacoustic Device The device used to complete the conversion between electrical signal and sound signal in the circuit is called electroacoustic device. There are many types of it, including speakers, microphones, headphones (or earplugs), transmitters, receivers, etc. 10. Photoelectric Device Photoconductive devices that work with the photosensitive properties of semiconductors, photovoltaic cells and semiconductor light-emitting devices that work with semiconductor photovoltaics are collectively referred to as photoelectric devices. 11. Display Device Electronic display device refers to a photoelectric conversion device that converts electrical signals into optical signals, that is, a device used to display numbers, symbols, text or images. It is a key component of electronic display devices and has a great impact on the performance of display devices. 12. Sensor The sensor can sense the specified measured value and convert it into a usable signal according to a certain rule. It is usually composed of a sensitive element and a conversion element. 13. Surface Mount Components Surface mount components (SMC and SMD) are also called patch components or chip components. They include resistors, capacitors, inductors and semiconductor devices, etc. They have the characteristics of small size, light weight, no leads or very short leads, high installation density, high reliability, good vibration resistance, and easy automation. 14. Thyristor SCR, short for silicon-controlled rectifier, is a high-power semiconductor device with a four- layer structure of three PN junctions, also known as thyristor. It has the characteristics of small size, relatively simple structure and strong functions, and is one of the more commonly used semiconductor devices. 15. Switches, relays, and various connectors Switches are used to cut off, connect or convert circuits in electronic equipment. Relays are
- 3. automatic control devices that will change the output in a jumpy manner when the input quantity (electricity, magnetism, sound, light, heat) reaches a certain value. If you have interest in our service, please feel freely contact Cynthia at sales11@hitechpcb.com & 86 18126197150.