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本文介绍一种由程控单结晶体管和运算放大器组成的过零触发电路,输出触发脉冲采用光电耦合器实现电隔离,电路新颖,结构简单,运行可靠。
This article introduces a zero-crossing trigger circuit consisting of a programmable single-junction transistor and an operational amplifier. The output trigger pulse is electrically isolated by a photocoupler. The circuit is novel, simple in structure and reliable in operation.