You may need also need 10 diodes and different resistors, especially if you are using white LED`s please the Troubleshooting section in step 3 for details. . 005 ³ thick matte drafting film I bought a sheet from a local artist`s supply store. The smallest sheet they had was way more than I needed 24G—36 ³ The LED`s I used were po
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int source water clear. If you don`t want to deal with hotspots in your display, diffused would be better. I had to put blobs of hot glue on mine to diffuse them. The photo below only shows bits of the foam board, because I forgot to photograph the parts before I started. The piece I used was about 16G—20 ³ to start with. I used foam board, which was recycled from one of my kids` science fair projects. It is a sandwich of white paper with a foam core, 3/16 ³ thick. The overall size is approximately of our project is approximately 10x10x2 ³. I cut the parts with a mat knife, and hot glued it together. To make the grid, cut 8 identical 2G—10 ³ pieces. Then cut 4 equally spaced slits into each one. The slits should be 1 ³ deep, the same width as the foam board. Interlock the pieces to create the 5G—5 grid. Finally, cut the 2 (10 3/8)x2 ³ pieces for the top and bottom. My foam was 3/16 ³ thick, so I had to add 3/8 ³ tothe length to make them long enough to cover the sides. Hot glue them on. Note that in the photo below which includes the top & bottom & sides, the LED`s are already installed and wired up. This is because I didn`t attach the top/bottom/sides until I was in the testing phase, but it`s easier to deal with if you glue them on earlier in the process. Cut small diagonal slits in the center of each cell, and insert one LED in each cell. Make sure to orient them the same way in each cell. This will make it less...
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The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
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The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
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This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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