Dark Sensitive Switch Electronic Circuit Diagram

Dark Sensitive Switch Electronic Circuit Diagram

Reviewed by: Claire

On: 13 Jun, 2016

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Category: Alarm

Dark Sensitive Switch Electronic Circuit Diagram Rating:
4.8
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Dark Sensitive switch project based on single BC547 transistor, Relay operates when light that falls on the LDR, goes below a set point. It’s very simple and low cost dark sensitive switch required few components.

Dark Sensitive switch project based on single BC547 transistor, Relay operates when light that falls on the LDR, goes below a set point. It’s very simple and low cost dark sensitive switch required few components.

dark sensitive switch 1.jpg

Features

  • Input : 12 VDC @ 55 mA
  •  Relay output : NC – C – NO
  •  Onboard preset to set the level
  •  Power-On LED indicator
  •  Relay On LED indicator
  •  Screw terminal connector for easy relay output connection
  •  Four mounting holes of 3.2 mm each
  •  PCB dimensions 44 mm x 40 mm

Schematic

dark sensitive switch 2.png

Parts

dark sensitive switch 3.png

PCB

dark sensitive switch 4.png

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Light Or Dark Sensitive Switch Using CA741 Op-Amp

Light / Dark Sensitive Switch circuit is a simple project which operates a relay when the light falling on the LDR goes below or goes above a set point.

light or dark sensitive switch using ca741 op amp 1.jpg

light or dark sensitive switch using ca741 op amp 2.jpg

 

  • Input – 12 V @ 50 mA
  • Relay output – SPDT relay
  • 2-in-1 Project, either as light sensitive kit or dark sensitive switch
  • Onboard preset to set the level
  • Power-On LED indicator
  • Relay On LED indicator
  • Power Battery Terminal (PBT) for easy relay output connection
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 50 mm x 54 mm

 

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