1, on the printed circuit board tp,l,q represents the diode.
2, Diode, an electronic component, a device with two electrodes that allows current to flow in only one direction, and many uses are for its rectifier function. Varicap diodes are used as electronic tunable capacitors. The current directivity of most diodes is often called the \"Rectifying\" function. The most common function of a diode is to allow the current to pass in only one direction (called forward bias) and block it in the opposite direction (called reverse bias). Therefore, the diode can be thought of as the electronic version of the check valve.
3, printed circuit board {PCB circuit board}, also known as printed circuit board, is the electrical connection provider of electronic components. It has a history of more than 100 years; Its design is mainly layout design; The main advantage of using circuit boards is to greatly reduce wiring and assembly errors, improve the level of automation and production labor rate.