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We usually think of the symbol for a rheostat as "VDR". It is a resistance device with nonlinear voltammetry characteristics. It has characteristics such as resistance. Mainly used for voltage input before the input voltage clamp within a certain range to absorb excess current. It has a response time of ns class, is very fast, and is a special component used to protect the back circuit, especially in protection. We often use zinc oxide SMD patch varistors.

Tell you what a varistor does: Varistor shows good voltage limiting characteristics, when the voltage rises again, varistor into the saturation zone, showing a small linear resistance, due to the large current, long time varistor will overheat, burn or even burst, normal use, varistor in the leakage current zone, by surge impact, into the non-linear zone release surge current, but generally can not enter the saturation zone. Overcurrent protection circuit: Tell you about the role of resistance in the circuit

It is used as a bias resistor to determine the operating point in the semiconductor tube circuit. For these functions, the application in the circuit is very much, but also very important. I will not describe it much.

电源板包封厂家分享常用的检测方法 集成电路常用的检测方法有在线测量、非在线测量和更换方法。 1.如果非在线测量非在线测量藻类集成电路未焊接到电路中，则将每个针脚之间的DC电阻值与正常同型号集成电路中针脚之间的DC电阻值进行比较，以确定其是否正常。

Power strips have been used in many places, so we must be familiar with this product when we see it. Today is to introduce the selection of formal power board packaging manufacturers need to consider two things? I believe that this problem is still a lot of people are more concerned about, the following is for you to do a detailed introduction, hope can bring help for more people.