Varactor diode in tuner
Varistor is used in the tuner of TV set.
Rectifier diode
By using unidirectional conduction of diode, alternating current in alternating direction can be converted into pulsating direct current in single direction.
switching element
Using the switching characteristics of diodes, various logic circuits can be formed.
Detector diode
Play a detection role in broadcasting. After the diode is turned on in the forward direction, its forward voltage drop remains basically unchanged. Using this characteristic, as a limiting element in the circuit, the signal amplitude can be limited in a certain range.
Flyback diode
It acts as a relay in inductive loads such as inductance and relay of switching power supply.
Test method of diode
The resistance of the multimeter X 100 or X 1K is the same, or the short circuit and open circuit are all bad. If there is a certain resistance on one side and the other hand does not move, the greater the positive and negative resistance, the better.