Hacking a Remote. Application Circuit 3


remote-5We construct different types of Infrared Receiver LED ( Rx) or IR Sensor ( TSOP 1738 ) based circuits. To test, the working of the circuit we have to use an IR Transmitter. Usually we use IC 555 based IR transmitter for this. But the frequency of the IR from the Transmitter should match with that of the Sensor, otherwise the circuit will not respond. Here is a simple solution to test the IR based circuits. Simply Hack a Mini Remote obtained along with low cost FM radio, Toys etc. You have such Remotes in your Junk box. Let us Hack one such Remote to make a Tester.
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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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Invisible Tester. Simple Design 8


IR-DIODE-TESTER-CIRCUIT-2Title of the circuit is deliberately given because it is used for testing the Photo diodes, Infrared LEDs, Photo transistors etc working in “Silent Mode”. How can we confirm an Infrared LED is working or not. It gives No visible indication. It is working and emitting Infrared rays but the IR rays are beyond our spectral response and we can’t see it. So this simple tester will help you to check whether such devices are good or bad before using in a circuit or even during trouble shooting. Not only one function the tester doing . It can test, all diodes, Capacitors, LEDs etc. Its cost is just Rs.10 but it is a worth tool.
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