SWITCHING CIRCUIT

PURPOSE:To attain stable operation of a switching system by widening a switch signal inputted at high speed into a pluse width over a prescribed period to make the speed of the signal coincident with the operating speed of a low speed switch thereby switching surely the signal of a switch object. CONSTITUTION:The circuit consists of retrigger monostable multivibrators 1, 2, NOT circuits 3, 4, NAND circuits 5, 6 and a flip-flop circuit 7. A No.1 selecting signal (switching signal) (a) for selecting a No.1 signal and a No.2 selection signal (switching signal) (b) for selecting a No.2 signal are inputted to a switching speed control circuit, from which a No.1 selection output (g) and a No.2 selection output (h) having a pulse width of a prescribed length or over corresponding to them are outputted. When the repetitive pulse of the No.1 and 2 selection signals is a repetitive pulse exceeding a prescribed period (smaller than the pulse width T), the pulse is outputted as a pulse whose width is prolonged for a prescribed period or over from the flip-flop circuit 7 to mask the fluttering of the selection signal.