Infrared Alarm System. Design Note. 19


IR-LED-PairThis design note explains how to design an invisible alarm system easily. Infrared Transmitter ( Tx) and Receiver ( Rx) LED pair is easily available which can be used for making this alarm system. Infrared transmitter LED emits infrared rays in the wavelength around 950 nm. This LED is a high current device that can handle more than 100 mA current. The IR receiver LED is a kind of Photodiode that generates a Photo current when it receives IR rays. So the IR LED pair is ideal to make an alarm system that operates both day and night.
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Familiarize Electronic Components Part III – LED


This part is colourful because it deals with LEDs. LEDs are seen everywhere from indicators to room lighting. It is popularizing due to its long life and low current consumption. Power loss through heat generation is practically nil in LED. It operates in low voltage and low current and is the inevitable part of an electronic gadget.

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