Circuit Diagram of Photoelectronic Pulse Omission Detection Composed of 556

Published:2011/7/2 1:03:00 Author:Vicky | Keyword: Photoelectronic Pulse Omission Detection | From:SeekIC

There is a several millimetric slit between the luminotron and photosensitive tube inside photoelectronic switch H13B1. When light-isolator object from outside is plugged into the slit, the photosensitive tube inside H13B1 presents high impedance because of the cutting-off of the beam of light. Then the IC1-2(1/2 556) sends out high level because that the pulse signal detection cannot receives reset signal, and it turns into a transient stability state. The correspondent transient stability time is td=1.1RwlC2 and the td can be changed by modulating W1. If the signal interrupting duration is longer than the transient stability time, IC1-2 resets, pin ③ sends out low level which stops BG1, SCR is conducted and the load RL is correspondently conducted. It will either cut down the power supply circuit or send out alarming signal.



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