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  1. J

    Possible to up Amperage of a 12V 500mA wall wart?

    So peak output is 45W. 45/12=3.75 So you will need a PSU to output 12V at <= ~4A max to run the head unit.
  2. J

    Night causes buzzing

    Your not using any of those energy saver CFL's are you? I know you said normal light bulb, but those have become pretty common these days and some would consider them normal light bulbs. Take that light out and put it in a lamp and then plug the lamp into the same outlet as the amp, still get...
  3. J

    transformer blowing fuses

    Res, is who confused me, as I thought transformers only put out AC. If he is measuring DC then that would mean the rectifier is still attached and could possibly be the culprit. The 16 ohms alfa, was the resistance of his fuse I believe. Which says that the fuse is at least still functional.
  4. J

    Lighting system for Didgeridoo

    With laplace's suggestion, I would imagine the analog route would be the easiest. Going the digital route would require programming knowledge and a slight understanding of FFT so you can use the library effectively. Guess it all depends on your skill level, but if you are just interested in...
  5. J

    LM317 circuit

    I really hope you haven't been staring into the LD with your naked eye all this time thinking the LD has not been working. Try not to blind yourself anymore then necessary.
  6. J

    Looking to commission a PCB construction

    Can you draw a schematic? That looks simple, but so do a lot of other things at first sight.
  7. J

    LM317 circuit

    Well since it is infrared spectrum, use your trustee video cam on the cell phone and have a look. But, davenn is probably correct in that his driver circuit is all wrong.
  8. J

    stepping up voltage does not work

    wouldn't that indicate a 1:1 transformer?
  9. J

    Looking to commission a PCB construction

    You could probably find someone to design a pcb, give you the required files and a parts list for your budget. If I had to take a guess. Maybe someone will be willing to help you out.
  10. J

    Looking to commission a PCB construction

    Your initial price point would be blown with one prototype pcb made I would imagine. Plus you want them to put it a nice little package for you. $125 bucks would barely cover pcb cost I would imagine. Maybe I am completely wrong
  11. J

    Plasma Torch Height controller (not so simple voltage divider)

    http://www.plasma777.com/driver/agelkom.htm Here is another THC, this one looks to use an H-bridge to control the motor. They don't specifically say how they know the distance or set it from what I can see. This H-brige could easily be made to run from the output of a op-amp in differential mode.
  12. J

    Plasma Torch Height controller (not so simple voltage divider)

    http://www.centricut.com/New_Lessons/lessons_10.html From what I can tell from the above article, the voltage increases when the torch-to-work distance increases and the voltage decreases when the torch-to-work distance decreases. The arc voltage is the same as the output voltage from the...
  13. J

    Possible to up Amperage of a 12V 500mA wall wart?

    Most wall warts are not made to be taken apart without destroying the outer case. They are normally fused together. I also don't think you will be able to replace a wall warts components to get 10A unless you replace every component. So why not just make your own linear power supply?
  14. J

    PCI Data Acquisition and signal processing controller

    http://support.ts.fujitsu.com/productselect.asp?Level1=20960&lng=com or search here under E5905 http://support.ts.fujitsu.com/Download/ShowFiles.asp?LNG=COM The vendor ID is intel, so look for drivers related to intel hardware off the above site enter your serial, find the right model then...
  15. J

    DC-DC step-up help?

    Steve has a good point though. As long as you can provide say 1.5A with the IC a capacitor could be just enough to get you over those times when you use just over 1.5A of current. After looking at your videos, I see that you can manually adjust your servo's in flight. If it was me I would do...
  16. J

    power cord orientation?

    I don't think it matters simply because the AC is rectified to DC. If you are in the US and you have different colored screws/terminals, then the convention is Hot/gold Neutral/silver Ground/green
  17. J

    DC-DC step-up help?

    Oh btw I like your rocket videos. since you have comments disabled thought I would mention it here. Wish it was a cheaper hobby.
  18. J

    Looking for a multiple 5 cell Maglight Battery bank charger

    If it was me I would figure out how much that power adapter is putting out and buy a transformer big enough to run 6/12 of them. Then wire it all in parallel. Now you have exactly what you want. You could just plug 6 of them into one power strip just as well.
  19. J

    DC-DC step-up help?

    It says within the first paragraph that it will produce 500mA at 8V off one lithium ion cell (Is that all you can get from one cell on any IC? ) But if you look down at the switching current limit vs Vin then at ~3V the max limit is just over 2A. I don't know in reality if it is possible, but my...
  20. J

    MikroC programming problem

    If mikroC is anything like C then you most certainly can include assembly code in your c code. http://courses.engr.illinois.edu/ece390/books/labmanual/c-prog-mixing.html http://www.codeproject.com/KB/cpp/edujini_inline_asm.aspx I don't know personally much about mikroC, but I somehow think it...
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