The photoelectric cam and groove coupling can constitute a switch circuit and constitute a logic circuit

　　The photoelectric cam and groove coupling can constitute a switch circuit.

　　The circuit in Figure 1, when the input signal UI is low, the transistor V1 is in off state, a photoelectric cam and groove coupling B1 current light-emitting diode is near to zero, the output terminal of the Q11, Q12 between the resistance, the equivalent of the switch is "off"; when UI is high, V1 conduction, B1. Light emitting diode, resistors Q11, Q12 between the smaller, equivalent to the "on" switch. The circuit for Ui is low, the switch is not, so the high conducting state. Similarly, the circuit of Figure 2, because there is no signal (Ui low), the switch is connected, it is low conducting state.

　　The photoelectric cam and groove coupling can constitute a logic circuit:

　　The circuit in Figure 3 as the logic circuit. The logical expression for the two photodiodes is P=A. in figure B. two photodiodes are connected in series, and only when the input logic level A = 1, B = 1, the output P = 1. Similarly, you can also compose "or gate", "NAND gate", "NOR" and other logic circuits.

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