Remote Tester. Home Utility Circuit 31


2BEvery Home requires a Remote Tester because we are now using a number of Remote controlled Gadgets like TV, Home theater system etc. The Remote handset emits invisible pulsed Infrared rays which controls the functions of gadgets based on the pulsed data arriving. The Infrared Receiver LED (Rx) or a Photo module in the gadget senses this pulsed IR rays and makes the gadgets function accordingly. The Infrared Emitter LED (Tx) in the remote handset is similar to an ordinary LED but emitting Infrared rays in the wavelength around 900 nanometres. This wavelength is beyond our Spectral response, so we can’t see it. So what will do to confirm whether the Remote handset is working or not. If this tester is not available, we have to go to the shop to purchase a new one. Sometimes, it may be due to battery problem. Let us make one tiny Remote tester. It blinks an LED if the Remote is good. Its cost is only Rs.25.
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