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The change in voltage from two indepentant sources activates this component. perhaps this is useful.

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Q: Simple Working of ic CA3140 and its use in wireless switch?
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What is switch wireless?

A switch that can be used to control the working of home appliances like flush system, hand dryer or else. The wireless switch needs no remote control for its working. You only want to move your hand between the infrared LED and photo transistor to control the device or load.


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