printing control double-sheet photosensitive circuit

Published:2011/6/5 4:48:00 Author:John | Keyword: double-sheet photosensitive circuit | From:SeekIC

In the figure, 6.3V of the transformer is used to power indicator and 2.5V of the transformer is used for polymer optical beads. When light exposure of 3DU13 is not blocked, the current can up to 8.5mA. When there is a piece of paper blocks the light, the current is only 5 ~ 6mA. But the relay is still working at this time. When there are 2 sheets of paper blocks the light, the current is only 3 ~ 4mA. And the relay stops working. Utilize this principle to control pharmaceutical printing by working with a single paper. Mechanical action by the relay can drive iron absorption switch of 5kg to take a series of mechanical motion control or to connect alarms to the police.



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