Light interruption detector

  
When the light incident on the LASCR is interrupted, the voltage at the anode to the 2N4990 unilateral switch goes positive on the next positive cycle of the power which in turn triggers the switch and the C230 SCR when the switching voltage of the unilateral switch is reached
Light interruption detector - schematic

This will cause the load to be energized for as long as light is not incident on the LASCR.




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