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  1. wellington

    ELM - White LED Head Lamp

    From: ELM This is a practical white LED head mount lamp (flashlight). Recently many white LED flashlights appear on the market. However, most flashlights require three cells because they are regurating output current with only series resister. The odd number of cells except one is not good, and...
  2. wellington

    ELM - NTSC(YC/RGB) to VGA Scan Converter

    From: ELM This is a video scan converter to display NTSC video signal into VGA monitor. Normally, the VGA monitor occupies most desk top space, so that everybody will be thinking that if the VGA monitor can be used for video monitor. I tried to build a scan converter. Right photo shows my VGA...
  3. wellington

    ELM - Pocket Size MP3 Player

    From: ELM
  4. wellington

    ELM - NTSC Test Signal Generator

    From: ELM A video test pattern generator will be needed when calibrate or test video equipments. To characterize system performance and understnad it quantitative, wave form monitor, vector monitor and related video measurment equipments will be required. Some generic patterns, shch as color...
  5. wellington

    Problems with opamp circuit

    Boy this is giving me too much headache ??? The above circuit was the one i've build as a headphone amp, I do have a working one, but the problem is that i can't build the second (also my friends). The problem is that when i turn the power on, the sound start to crack(or something like that)...
  6. wellington

    Great Free Book -

    Rectifier Applications Handbook In PDF
  7. wellington

    My new headphone amp :-D

    Hello all, The other circuit that i've build was simple, but the sound was too flat, so i've build this one, the original can be found here, what can I say? Very, very, very............good sound, so clean plus a good bass kicking (much better than the other one), i've made some modifications...
  8. wellington

    Problem with mini amp circuit

    I've build a mini amp to use with my xbox (audio out) and headphones, from a 10 years old magazine. The problem is that the final output is to loud and distortion are very high, looks like i have a loud input with low volume, very strange. Since i am a circuit builder not a developer, i need...
  9. wellington

    True Knight Rider KITT scanner

    Hello everyone! My name is Wellington from Sao Paulo - Brazil ;) I'm glad to find such a site, this is great!!! So if you want the same look a like Knight Rider KIIT Scanner, this is the one. It gives the most close results from the original scanner, with trail lights. You also can check this...
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