555 disconnection photoelectric isolation protecting circuit

Published:2011/6/13 23:25:00 Author:nelly | Keyword: disconnection, photoelectric isolation | From:SeekIC

As shown on the figure 10-9, the circuit consists of the CCD and monostable trigger circuit. Gernerally, the CCD 4N25's LED has a current ration. Once it is power-off by some faults, the diode will not light and the 4N25's will be cut off, the 555's 2 foot will be low power level. Then the J will release and the J1-1 will turn off to protect the circuit. This circuit can be used in other occasions, such as distant warning.



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