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单向可控硅符号如图①,若手头没有合用的可控硅,可用相应功率的硅PNP、NPN管组合代用,电路如图②。
Unidirectional silicon symbol shown in Figure ①, if there is no SCR on hand, the available power of silicon PNP, NPN tube combination of substitution, the circuit shown in Figure ②.