| 摘要 |
PURPOSE:To prevent contact sections from accidents such as seizure in a control circuit for turning on-and-off at least two lamps by operating a T type flip-flop circuit with push switched signals as trigger pulse to turn on and off the lamps. CONSTITUTION:When a switch SW1 is depressed once, one pulse is generated from the output of a trigger pulse generating circuit 4 so that a T type F.F circuit 8 generates the output H which turns on a lamp 18 through OR circuit 14 and a semiconductor switch 16 and at the same time resets F.F circuits 9, 10 through reset circuits 12, 13 without driving OR circuit 15 and a semiconductor swtich 17. Next, when SW1 is depressed twice, the output pulse of the circuit 4 is again generated to reset F.F circuit and turn off the lamp. Then, similarly a lamp 19 is turned on or off by SW2 operation and at the same time lamps 18, 19 are turned on or off by SW3 operation. Also, for example, when SW2 is depressed once after SW1 is depressed once, at first the lamp 18 is turned on and then the lamp 19 is turned on after the lamp 18 is turned off. |
