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Search results: 145   Output: 91-100
  1. Dave Clausen The problem: Grass dies without strong sunlight. The solution: Construct a grow light that doesn't consume a lot of power, doesn't block the natural sunlight, and produces natural-looking colors. Step 1: Solder up strings of red, ...
    02-11-2008
  2. Here is a white-LED-based emergency light that offers the following advantages: It is highly bright due to the use of white LEDs. The light turns on automatically when mains supply fails, and turns off when mains power resumes. It has its own ...
    01-09-2008
  3. joe The LED VU Meter was the height of late 80-s boombox technology. This instructable will build one out on the breadboard. Who doesn't like blinking lights.. You will need either the National Semiconductor LM3916 / LM3915 / LM3914 , 2 for ...
    Circuits » Audio · Light » National Semiconductor » LM3914, LM3915, LM3916
    01-09-2008
  4. After making my pyramid mood light with 12 high power leds, i decided to make a bigger and better version, without the emphasis on the low budget. After all, the pyramid mood lamp was more of a proof of concept with its shortcomings. I wanted the ...
    17-04-2008
  5. Relying on the dynamic conductance of optoisolators' junctions, simple optoisolator bridges compute the watts and volt-amperes of an ac load. W Stephen Woodward, Chapel Hill A decade or so ago, I designed a simple circuit that included a quad ...
    08-04-2008
  6. Geoff Nicholls You can build simple LED illuminators using the red LED to sense ambient-light level. Ordinary red LEDs normally function as light emitters, but they can also function as photosensors. A single LED can even function as both a light ...
    01-04-2008
  7. Wichit Sirichote Easy build and use, the general purpose Big LED with SPI serial interfacing. Expandable for multiple digits but still uses only three wires for receiving data from any uC boards. The circuit uses a serial-in-parallel out shift ...
    31-03-2008
  8. AlexTheGreaton You never know when you might need a glowing cube to convince people you are from the future. To make this you will need: A LED (preferably high power) a 3 V coin cell battery a 100 Ohm resistor (anything close to 100 will work) a ...
    28-02-2008
  9. Smilodon A while ago I made a door with a glowing image to go between my hall and living room. It worked great for a while, but it had a few flaws. First of all it got a bit bent when the wood dried. (I thought the glued wood sandwich I used would ...
    20-02-2008
  10. This simple method lets you make LCD backlight of any color and size to bring new look to an old device. For this job you'll need piece of transparent plastic, LEDs, resistors and some wire plus good set of different tools and couple of straight ...
    22-01-2008
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