Although the voltage stabilizing circuit composed of voltage stabilizing diodes has low stability and small output current, it has the advantages of simplicity, economy and practicality, so it is widely used. In the actual circuit, we should pay attention to the following problems if we want to use the zener diode well.

1. Attention should be paid to the difference between general diodes and voltage stabilizing diodes. Many general diodes, especially glass encapsulated tubes, are similar in appearance and color to zener diodes. If they are not carefully distinguished, they will be used incorrectly.

2. Pay attention to the difference between forward and reverse use of zener diode. When the zener diode is used for forward conduction, it is basically the same as that of ordinary diodes. After the forward conduction, the voltage at both ends is basically unchanged, about 0.7V.

3. Pay attention to the pressure difference between input and output. In normal use, the output voltage of the voltage stabilizing diode voltage stabilizing circuit is equal to the voltage stabilizing value at both ends of the voltage stabilizing tube after reverse breakdown.

4. Generally, voltage stabilizing tubes are not used in parallel. After several voltage stabilizing tubes are connected in parallel, the voltage stabilizing value will be determined by one (including the voltage value after positive conduction).