In this paper, a 16 stages digital controlled DC stabilized voltage source based on LM317 is designed. Selection and realization of the adjustable resistance in this source is introduced.

以三端稳压集成电路LM317为基础，设计了一种16级数控直流稳压电源，介绍了该电源中可调电阻的选取与实现。

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In the end, it discussed the protection system of DC voltage-stabilized source and put forward the principles of protection system design and the measure of the whole machine protecting.

最后讨论了稳压电源的保护系统，提出保护系统设计的原则和整机保护的措施。

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