The logic circuit diagram composed of photocoupler

  
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Figure 1 is AND gate logic circuit. Its logic expression is P=A, Figure B has 2 photodiodes in series. When input logic level A=1, B=1, output P=1. In a similar way, itcan form Or gate, NAND gate, NOR gate and some other logic circuits. As shown in figure 2, it is a typical AC coupling amplifier circuit, which is suitable for selecting lightin..
The logic circuit diagram composed of photocoupler - schematic




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