| 摘要 |
PURPOSE:To attain sure signal detection even if the level of an input voltage is fluctuated by comparing an input voltage with the input voltage through an anti-parallel circuit comprising rectifier elements and a capacitor. CONSTITUTION:The input voltage such as an AC signal is compared with a positive or negative voltage corresponding to a peak of the input voltage outputted when the peak potential difference is a prescribed value or over in response to the peak of the input voltage through a circuit 2 consisting of an anti- parallel circuit comprising diodes D1, D2 and a capacitor C connected thereto by a comparator 1. The positive or negative detection pulse is given as the output and even if the level of the input voltage is fluctuated and the peak level is fluctuated due to noise in the range where the peak level is within a prescribed value, the detection signal is detected surely. |
