Changing A Light Source

thitchen007: Dr. Lettsome, Thank you so much for your video. I learnt a lot form it. Do you think a light from a red LED can activate your switch in your video “Light Sensitive Switch“? Or what kind of photo-diode do you think can do that job, i.e. activate a switch by a light emitted …

Light Sensitive Switch

Demonstration of a simple light sensitive switch made with an op-amp configured as a comparator. Obtain schematics for Free at