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.

• 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