Touch the red probe of the multimeter to the positive terminal of the diode and the black probe to the negative terminal of the diode. If the pointer is at or near infinity, the tube is qualified.
According to their characteristics, point contact diodes are classified into forward and reverse characteristics as follows
According to their characteristics, point contact diodes are classified into forward and reverse characteristics as follows.
In principle, the diode used for detection is used to extract the modulated signal from the input signal, which is called detection.
Modulation diodes usually refer to diodes specifically designed for ring modulation
Varactor diodes are small power diodes used for automatic frequency control (AFC) and tuning.
