Infrared (IR) Detector
Chris at The Keeser has constructed a simple circuit to detect infrared light. You can make the project using only 7 parts. A schematic and analysis of operation is also provided. Parts Needed: * 1K ohm * 330 Ohm * LED * IR transistor * 2N3904 NPN transistor (any NPN will do) * Battery Snap * Perf Board “Test the circuit by holding it close to an IR remote control