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Touch Delay Switch Module DIY Kit Smart Switch for Light Control

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1.Operating Principle:
  The left dotted portion is ordinary illumination circuit,right side is electronic switch part.
  VD1-VD4,VS constitute switch main circuit,VT1,VT2 constitutes switch control circuit.
  In normal times,VT2 base no body touch current injection in cut off state.
  VD1-VD4 rectified output 220V ripple DC voltage connect with VT1 through R3;VS is off and the lamp is off.
  When use your hands to touch polarity M,body leakage will devide voltage through R6,R5,R4;
  and it will let VT2 connected,charge saved by C1 will let out through VT2.VT1 will close because of no base current,
  VD1-VD4 will be cut off rectified output 220V pulse DC current will let VS connected through R2,and lamp HL will be on.
  When humans hands leave polarity M,VT2 will be cut off because of no base current, R3 current will start to charge for C1.
  Then lamp is still on;when C1 is charged to a certain value (0.6V),VT1 will be connected repeatedly,VS will lose trigger voltage;
  when alternating voltage is over zero,it will be off immediately and the lamp will be off.
  Changing C1 capacity will alter relay time of closing lamp, and you can adjust it according to its capacity.

  Staircase, bathroom, corridor, warehouse etc.

3.Packing List:

4.Finished Product Picture:

5. Circuit Picture:




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Touch Delay Switch Module DIY Kit Smart Switch for Light Control