The dual steady circuit of photoelectric couplers and transistors

Published:2011/6/10 21:13:00 Author:qqtang | Keyword: dual steady circuit, photoelectric couplers | From:SeekIC

In the figure is dual steady circuit of photoelectric couplers and transistors. At the moment of power-on, the transistor VT is blocked, and the circuit outputs a high LEV. When the input pole is imposed with a positive pulse, the current in the VT collector electrode is rising, the photoelectric coupler and LED are glowing, the resistance between light dependent triodes are stepping down, as a result, the current on the basic pole of VT is increasing which forms a forward-backward feedback, and VT is saturated quickly, 1 becomes 0 . When it is input with a passive pulse, the current on VT collector electrode is reduced.



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