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Search results: 145   Output: 41-50
  1. Abel Raynus, Armatron International Inc, Malden MA There are many approaches to the problem of activating a light when it becomes dark, and a recent Design Idea covers this topic (Reference 1). Some approaches require a dc power supply and an ...
  2. Mincior Vicentiu, Braila, Romania. Inside the case of a regular wall charger with a 500mA transformer I’ve built a source in commutation for powering 10W LEDs by using a TOP242 integrated circuit in the primary part and the LM393 dual ...
  3. This experiment shows how to turn LEDs into light sensors. Since the Blinkenlight Shield has 20 of them this turns the Blinkenlight Shield into a 20 pixel „camera“. Schematics Before I explain why the schematics got their current form ...
  4. Vladimir Rentyuk, Zaporozhye, Ukraine A magnet waved past a Hall-effect sensor does the trick This circuit allows you to turn on your holiday bulbs with a wave of the magic wand. The strings flash in sequence. At the heart of the idea is the ...
  5. Sajjad Haidar, Canada The LED and a discrete inductor form an LC tank circuit You can use the inherent capacitance of an LED to make a series resonant boost circuit that can create a voltage large enough to light the LED. Depending on the color of ...
  6. Overview: The Voxel Shield is an Arduino Sheild (or expansion board) used for controlling large numbers of LEDs. The Voxel Shield can drive up to 512 LEDs, making it possible to make an LED cube up to 8x8x8 voxels, or an LED screen of 64×8 ...
  7. Hold the current constant and within tolerance. Steve Sheard, ON Semiconductor, Tempe, AZ LEDs are more efficient than incandescent lights and can last 100 times longer, but they require specialized electronic-drive circuits to avoid overstress ...
    Circuits » Supply · Light · Power » ON Semiconductor » NSI45020AT1G
  8. George Varkey Here is a system based on PIR motion detector module BS1600 (or BS1700) that can be used for security or corridor lighting in powersaving mode. The 12V DC power supply required for the motion detector and the relay driver is derived ...
  9. Hélio Pereira Introduction In this project it was used the Piranha Super-flux RGB LED of common anode, and the PIC18F25K20 , in order to generate combinations of colors. It has two function modes, automatic that generate the color sequence ...
  10. Keep LEDs lit when AC voltage drops. TA Babu, India LEDs need power when rectified ac-mains voltage drops during its cycle. The circuit in Figure 1 lets you use an inductor-less, switching, offline power supply as an LED driver for emergency-exit ...

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