| 摘要 |
PURPOSE:To prevent the destruction of a circuit in a transceiver due to noise by connecting a in-phase amplifier having a high input and low output impedance to a terminal used in common for input and output of a pair of transceivers. CONSTITUTION:The 1st transceiver 1 and the 2nd transceiver 2 are coupled by a transmission line 11. A base of buffer transistors Q1, Q2 is connected to the terminals (a), (b) in common use for input/output of microcomputers 6, 10 of the 1st and the 2nd and transceivers 1, 2. Positive feedback resistors R1, R3 are connected to the input/output terminal of each transistor. When a terminal (a) of the microcomputer 6 is at L level in the circuit like this, the terminal (b) of the microcomputer 10 goes to L level, and when the terminal (a) is at H level, then the terminal (b) goes to H level. Thus, the microcomputers 6, 10 are not destroyed by noise. |
