| 摘要 |
PURPOSE:To obtain a simplified protector circuit which assures less surgings for input signals, by forming a switching circuit with a T-flipflop and an R-S-flipflop and by interposing a door switch circuit between the emitter of output transistor and the ground. CONSTITUTION:When voltage of a voltage stabilizing circuit 13 is supplied, a T-FF (flip-flop) 1 and an R-S-FF (flip-flop) 2 will be reset in the initial period. When a manual operational switch 3 thereafter is given a push, the Q terminal of T-FF 1 is turned to H to light up a room lamp 10. If another push is applied, the Q terminal is turned to L and the lamp 10 will be put out. When by contrast a door-interlocked operational switch 4 is given a push, the Q terminal of P-S-FF 2 is turned to H, but the lamp 10 is not lighted up because a door switch 7 between the transistor 6 and ground is off in the initial period. If the switch 7 is turned on, the lamp will now be lighted up, which is put out by pushing the switch 4 again. Accordingly input signals to electronic circuits have less trouble about being mixed with surger noises to assure a simplified protector circuit as well as a reduced space for the reset circuit. |
