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The connector circuit of photoelectric couplers

2014-11-03 08:34  
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The connector circuit of photoelectric couplers
See as the circuit, the photoelectric coupler 4N25 performs the functions of coupling pulse signals and separating single chip computer 89C51 system from its output part, which makes the two parts separated. The output part of the ground wire connects with the shell and the earth, the power supply ground wire of 89C51 system is suspended, which is not connected with ground wire of the AC power supply, so that the power supply change of the output part has little effect on the single chip computer power supply, the effect on the small system is reduced, and the reliability of the system is increased.