| 摘要 |
PURPOSE:To ensure an accurate operation for plural switches with a simple constitution, by connecting plural units of series circuits of switches and impedance elements in parallel to a load and providing a signal source and a level discriminating means at the point of connection. CONSTITUTION:For a signal producing circuit 20, series circuits 26, 29 and 32 of switches 21, 25, 28 and 31 and impedance elements 24, 27 and 30 are connected in parallel, and a load 22 and a power supply 23 are connected in series. A control circuit 35 containing an oscillating circuit 36, a wave detecting circuit 37 and wind comparators 38, 39 and 40 is connected to a point 33 of connection. The output of the circuit 37 varies by closing either one of switches 21, 25, 28 and 31. Then a control switch is detected with the outputs of the wind comparators 38, 39 and 40. |
