The circuit board u1 stands for integrated circuit. Integrated circuit refers to the use of a certain process, the transistors, diodes, resistors, capacitors, inductors and other components and wires required in a circuit are interconnected together, made in a small or several small pieces of ceramic, glass or semiconductor wafers, and then packaged together to become a miniature electronic device or component that can achieve certain circuit functions. Therefore, the integrated circuit has the advantages of small size, light weight, few pins, long life, high reliability, low cost, good performance, and so on, but also easy to large-scale production.
On the circuit diagram, U1 is represented as a mark on the circuit board of an integrated chip. Do you usually use U? A number that stands for integrated chip (IC). There are many integrated chips on the circuit board, in order to facilitate the location of the U? To show the distinction. In addition, if it is in circuit operation, it indicates a voltage point identification number.