| 摘要 |
PURPOSE:To prevent the malfunction due to a noise, by alternately generating two signals having mutually different frequencies, setting and resetting an FF only when receiving said two signals and then detecting a change of the stable of these two sing nals. CONSTITUTION:The different frequencies generated from resonance circuits 10 and 11 are applied to intergral networks 19 and 23 via diodes 18 and 22. The output of the circuit 19 is spplied to an input of an NAND gate 45, and the output of the circuit 23 is applied to the other input via an NOT gate 46. The output of the gate 45 is reversed by an NOT gate 47 to be applied to an FF28 as a set signal. The output of the circuit 23 is applied to an input of an NAND gate 48, and the output of the circuit 19 is applied to the other input via an NOT gate 49. The output of the gate 48 is applied to an FF28 via an NOT gate 50 as reset signal. Then a change of the stable state of the FF28 is detected by the cooperation of differential capacitors 32 and 35, diodes 33 and 36, an integrating capacitor 34 and a transistor 37 respectively. Then a load 38 is controlled. |
