| 摘要 |
PURPOSE:To prevent an erroneous signal from being inputted to a processing circuit even at an open cord between a switch and the processing circuit by providing delay elements whose time constants differ from each other to input terminals of a RS flip-flop (FF) and constituting the titled device by a power supply giving a signal voltage to the terminals of the FF and a switch selecting the input terminals of the FF. CONSTITUTION:Time constant circuits consisting respectively of a resistor Rs, A capacitor Cs and a resistor Rr, a capacitor Cr are connected respectively to a set and a reset terminal of the RS-FF. In this case, a different time constant is given to the time constant circuits and the input terminal of the RS-FF is selected by the changeover of the switch Sw. Thus, the malfunction taking place at an open cord between the switch SW and the processing circuit A is prevented and the output of the RS-FF is kept to either the set or the reset state according to the difference in the said time constants even at a no signal state due to the open cord by the reapplication of power.
|
