IR LED Tester. Application Circuit 2


led-testerIR Rays are invisible to human eye, so it is very difficult to check the working of IR LED. Usually we use a Mobile camera to test IR LED since the pink light from the IR LED becomes visible in digital camera. We can make a simple IR LED tester so that, before using it in the project, we can confirm whether it is good or not. Lot of IR LEDs are also in our Junk box. So we can check all IR LEDs and  discard the damaged ones. The same tester can be used to check all ordinary LEDs, Photo diodes, Silicon and Germanium diodes etc.

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Flame Sensor. Start Up Project 30


8AWhy going for a costly Fire Alarm system? Some of the Fire alarm systems cost more than Rs.2000. You can make an efficient Fire warning system for just Rs.20. It uses only a few components and is a very efficient Flame sensor. The Thermister based commercial Flame sensors have a drawback because, the alarm sounds only when the Thermister turns hot by the nearby flame. That means, the alarm sounds only after the room is full of fire. But this tiny circuit overrides that drawback. It uses a Photodiode as Fire sensor. It sounds the alarm even if the flame is far away . Interestingly, the spark of the first fire burst can activates the alarm. It can be installed in Home, Commercial shops etc. It will not activate in the ambient light of the room like that of Fluorescent light. It sounds the alarm only when it detects a light similar to a flame, sunlight or incandescent bulb. It is battery operated and in the standby state the current consumption is as low as 5 mA. So Simple, Efficient, and Low cost. Build it.
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Familiarize Electronic Components Part VII – Photodiode


Photodiode is a type of light detector capable of converting light energy into either current or voltage, depending upon the mode of operation. Photodiodes are similar to typical semiconductor diodes except that they may be either exposed or packaged with a window to allow light to reach the sensitive part of the device.

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Familiarize Electronic Components Part I – Resistor and Capacitor


Electronics is a Fun and Hobby and you can try a circuit if you have some basic knowledge in electronics. Circuit making is an interesting hobby and it will improve your memory; sharpness and more over you will utilize the spare time to learn more. The Articles posted here in series will help you to understand the working of electronic components. Component identification tips, Pin assignment of components etc will also be included. Start electronics and enjoy its beauty.

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Optoelectronic Devices


Optoelectronic devices are used to activate or deactivate an electronic circuit based on the intensity of light. Besides this general purpose, optoelectronics devices are used in telecommunication, surveillance systems, capturing solar energy etc. Solid state optoelectronic components are used as sensors for detecting visible light, Infrared rays Laser, Ultraviolet rays etc. The note given here explains the different types of optoelectronics devices and their applications.

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Photodiode Design


Photodiode is a type of light detector capable of converting light energy into either current or voltage, depending upon the mode of operation. Photodiodes are similar to typical semiconductor diodes except that they may be either exposed or packaged with a window to allow light to reach the sensitive part of the device.

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