1. if you enter a high level, while the output requires a low level, NPN is the first choice. 2. if the input and output of a low level, need a low level, PNP is the first choice. 3. if the input and output of a low level, requires a high level, NPN is the first choice. 4. if you enter a high level, while the output requires a high level, PNP is the first choice

三极管常用电路.doc

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