Light interrupt detector circuit

Published:2011/6/22 3:12:00 Author:TaoXi | Keyword: Light interrupt, detector | From:SeekIC

When the light which projects on the light-excited SCR interrupts, the voltage of the single-pole switch 2N4990's anode tends to the forward direction in next positive half-cycle. When the voltage reaches to the open voltage of the unidirectional switch, it triggers the unidirectional switch and the SCR C230B. As long as the light does not shine on the light-excited SCR, the load will be stimulated.



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