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  1. R

    Specialized Power Supply

    right... that'd be the first thing I learned in electronics class, except that I don't have a 3v power supply, nor the interest in buying hundreds of resistors of various values. I was looking for something more or less.... usable.
  2. R

    Specialized Power Supply

    Same paramaters, 3v. I didn't mean "out of the picture" entirely, I just meant a fixed voltage, constant current. Anyway, amperage would also be the same... minimum adjustment of down to around 25 or 50mA (or less) preferred, and it has to go up to at least 750mA. Anything more is fine, I just...
  3. R

    Specialized Power Supply

    Well, I tried pricing out the ckt that Ante mentioned, but it's coming out at $38 before you count a proto board and a box + wiring (just the components themselves), which is out of my price range. I was wondering though - all I really need is a stable, regulated current supply at 3v. Does that...
  4. R

    Specialized Power Supply

    So I'm told... I'll show you what I did: I googled "LM2575", and found this result: http://www.national.com/pf/LM/LM2575.html I went there and filled out the " LM2575 WEBENCH® Custom Design/Analyze/Build It/Test It" box with my exact specs, and then it said I could not achieve those...
  5. R

    Specialized Power Supply

    Hey, I wish I'd seen that last night...  :-X anywho, I ordered a 'sample' of a LM5010, their website drew me up a schematic and listed components and stuff so I bought them all from mouser (only about $12 + $11 for the 'sample'). Let me know what you think of this circuit, it looks very well...
  6. R

    Specialized Power Supply

    I googled the LM2575 and I found an amazing feature of national.com - I told it what I wanted from my power supply, and it picked all the components, made a schematic, and even ran an analysis for me! This is incredible! You definately gave me a 'push' in the right direction... thank you!
  7. R

    Specialized Power Supply

    Hello! I am trying to build a low cost power supply (driver). It needs to be current limited (adjustability is good). It's going to be used to operate an optical device so regulation based on feedback from a photodiode would be superb. I've looked around at a lot of circuits but none seem to...
  8. R

    Daylight Controlled Solid-State Lighting

    Hello, I'm in the process of building a new (small) aquarium and I'm always bothered by lighting problems. I had this idea... Have Red, Green, Blue, UV, and IR LEDs in groups in a large array over the tank to produce realistic lighting. The first problem is, of course, where to find the...
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