Classification of Crystal Diodes (2) 1

Classified by purpose

1. In principle, the diode used for detection is used to extract the modulated signal from the input signal, which is called detection. The output current less than 100mA is usually called detection, with the size of the rectified current (100mA) as the boundary. Germanium material is a point contact type with a working frequency of up to 400MHz, low forward voltage drop, small junction capacitance, high detection efficiency, and good frequency characteristics. It is a 2AP type. A diode used for detection similar to a point touch type can be used not only for detection, but also for circuits such as amplitude limiting, clipping, modulation, mixing, and switching. There are also two diode assemblies with good consistency of characteristics specifically designed for frequency modulation detection.

2. In principle, the rectifier diode is used to rectify the DC output obtained from the input AC. The output current greater than 100mA is usually referred to as rectification, with the magnitude of the rectified current (100mA) as the boundary. Surface junction type, operating frequency less than KHz, with a maximum reverse voltage ranging from 25 volts to 3000 volts divided into 22 levels A to X. The classification is as follows: ① 2CZ type silicon semiconductor rectifier diode, ② QL type silicon bridge rectifier, ③ 2CLG type used for high voltage silicon stack working frequency of nearly 100KHz in televisions.

3. Most diodes can be used as limiting diodes. There are also specialized limiting diodes such as protective instruments and high-frequency Zener diodes. In order to provide these diodes with particularly strong limiting effect on sharp amplitude, diodes made of silicon materials are usually used. There are also components available for sale: according to the voltage limit requirements, several necessary rectifier diodes are connected in series to form a whole.