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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

    Hello audioguru and MP. First of all, Thank you for providing me some light in this issue. Strange, the Protel library was wrong about this device, checking the IC, now, it has pin8 GND >:( It's a demo version by the way... I've check the first circuit (again) and changed the IC's, it...
  6. wellington

    Problems with opamp circuit

    audioguru I Love you ;D (you know what a mean, when i say love, not the LOVE you fell about other person, well...never mind) It works!! ;D ;D ;D ;D It works!! ;D ;D ;D ;D All the five circuits, put the regulator back and disconnected the pin 8 from ground and is great, working!! I've check...
  7. wellington

    Problems with opamp circuit

    Hello MP, Well, i'm not trying to redesign the circuit but to build another since none of my friends could, what i think that was strange at first but doing again at my home i could not do it also. I'm sure all conections are fine and checked step by step. I've checked the components, changed...
  8. 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)...
  9. wellington

    Great Free Book -

    NP ;D
  10. wellington

    Great Free Book -

    Rectifier Applications Handbook In PDF
  11. wellington

    vocie actavated super computer :)

    Yep, i will get me one soon ;D The problem to make the computer respond to any one is that some stange can get in to your computer and stole data etc.
  12. wellington

    vocie actavated super computer :)

    Hello velosity1, I've been thinking about this computer structure for years, let me try to explain my version. All started with Knight Rider here in Brazil is know as "Super Máquina (Super Machine)" when i was eight years old. Voice recognition - Identify the main key of human voice...
  13. wellington

    My new headphone amp :-D

    Hello audioguru, At last it work well ;D Yep, please note that the original uses normal cables to input/output this will increases the interference, i did mine with shielded cables at the input and output. The bass of this little 'beast' gives a good punch without killing the high frequencies...
  14. 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...
  15. wellington

    Problem with mini amp circuit

    Thank you audioguru for the tips. The board of this circuit is very small and can't handle a 1000uF cap, also the box that i have put this boards is small too. With that changes i have a clear (flat) and soft sound, to make the circuit punch the bass a little, using this diagram i use R/C (R7...
  16. wellington

    Problem with mini amp circuit

    Thanks audioguru, i miss words to express my self :'( It was like a overdrive, sounds like it's loud but is not, distorted sound with volume control. Never mind, i've fixed ;D ;D ;D This was the changes that i've made, now the sound is very clear and smoth with no distortion :D About the...
  17. wellington

    Problem with mini amp circuit

    Thanks again audioguru. I have done some tests here, and find out that if i change that 4k7 resistor to something like 100k the sound gets much better, but still look like a over amplifyed sound like a guitar overdrive (sorry don't know the name, is the one that distorts the sound). The volume...
  18. 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...
  19. 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...
  20. wellington

    LED Circuit

    I know where this circuit came from ;D Here I've build the above circuit, and has nothing to do with Knight Rider KITT scanner. Check the little trails that is left behind, maybe if you put a 10uF to 100uF eletrolytic capacitor to slow down the discharge of the LED lit, you could get the same...
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