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741 Based Light Sensor:  CdS photocell used for light/dark controlled relay

Casio QV 200 Digital Camera Cable: Lose your cable? Build it yourself and save $29. Fits many QV models.

Infrared Remote Control Shutter Release System:

Infrared Train Detector:

Kirlian Device Supply:

Lightning Activated Camera Shutter Trigger:

Simple Train Detector: Train Detector using ambient light and a photocell