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For the frequency doubling effect of diodes, there are frequency doubling relying on varactor diodes and frequency doubling relying on step (i.e. rapid) diodes.
1. Sudden increase in power supply voltage. There are many reasons that can cause a sudden increase in the voltage of the power supply, such as quality issues with the power supply or improper use by the user.
The resistance value of the resistor should be calculated according to the design, and standard resistance series resistors should be preferred
When using neon glow bulbs, the following precautions should be taken
Stability refers to the degree to which the parameters of an inductor coil change with environmental conditions