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  1. KrisBlueNZ

    LED Charging Indicator

    A thin film resistor will be fine. Can you post the exact schematic of your test circuit? The MAX4372 has an input offset voltage of up to 1.3 mV in either direction which will translate into an output offset of up to 130 mV for the MAX4372H. You haven't given much information on your...
  2. KrisBlueNZ

    Mutiple clients with one Microcontroller unit

    That's a very vague specification. From your attitude in that post, I'm assuming you don't want to tell us much about the application. This is a problem because it wastes everyone's time. So if you would describe the overall application, that would help a lot. Otherwise, please give us some...
  3. KrisBlueNZ

    FARNELL 40MHz Oscilloscope DTV 40 Manual

    A quick web search showed that Telford Electronics will sell you an operator manual. http://www.telford-electronics.co.uk/manual.php?alpha=F
  4. KrisBlueNZ

    Wish Me Luck ~ Hard Drive Surgery Tonight

    Hi CocaCola, I've got back onto my Samsung HD203WI 2TB hard drive that I dropped. The recovery company that I sent it to returned it to me with one airtightness label completely removed, and another partly lifted. I didn't notice this until after I had fired it up in my room (which is not a...
  5. KrisBlueNZ

    Question about capacitors

    You can use electrolytics rated for a higher voltage than the original, as long as you can make them fit. Higher-voltage components generally have better performance than lower-voltage components of the same capacitance, and will generally last longer. Electrolytics are not operated at their...
  6. KrisBlueNZ

    Lower Voltage with Resistor

    Resistors are, pretty much, voltage-to-current and current-to-voltage converters, yes. In your case, you should use a 5V regulator. These are very cheap and common. If you only need 100 mA of current out of it, you can use a 78L05, which comes in a TO-92 package like a small-signal transistor...
  7. KrisBlueNZ

    Lower Voltage with Resistor

    You DO need to split the voltage. You have a 9V battery, and you want a voltage of 4.5V. You can't reduce the voltage across the battery; it will always be 9V. All you can do is to "tap off" a portion of it. A voltage divider will do that, but any load (e.g. another resistor, or anything else...
  8. KrisBlueNZ

    Make a "blinker" for LED panel?

    Are you sure it reads "5%60Hz"? I think there's a typo somewhere - either in your post, or on the label itself! It's probably supposed to read "50/60 Hz" which means it will run at either 50 Hz or 60 Hz mains power. In America and some other countries, the AC mains frequency is 60 Hz. In some...
  9. KrisBlueNZ

    Make a "blinker" for LED panel?

    The output is equally important. The specification 60mW/cm^2 means that for each square centimetre of the emissive surface, there is 60 mW (that's 0.06 watts) of radiant power. CocaCola quoted a claim that the total power output was 3.5 watts. From those figures, the WARP75's emissive area...
  10. KrisBlueNZ

    Make a "blinker" for LED panel?

    CC, the article I quoted from is on the NASA web site and it stated that the tests were conducted over a 2-year period with 80 participants and used double-blind placebo-control protocol. Assuming that it was conducted properly, that kind of study is about the best you can get, and is accepted...
  11. KrisBlueNZ

    Make a "blinker" for LED panel?

    Actually, I'm just trying to save you from forming unreasonable expectations, wasting time and money, making claims you can't demonstrate, and being taken advantage of. While most of the volunteers here do like to help people with their electronic design projects, I for one also feel an...
  12. KrisBlueNZ

    Make a "blinker" for LED panel?

    Here's a summary of the article Elizabeth linked to: http://www.nasa.gov/topics/nasalife/features/heals.html The therapy is called HEALS ("High Emissivity Aluminiferous Luminescent Substrate"). It was developed by NASA for plant growth experiments on space shuttle missions but has been...
  13. KrisBlueNZ

    Make a "blinker" for LED panel?

    292 Hz (Hertz, pronounced "hurts") is 292 times per second. At this rate, the flashing will not be visible. Flashing at more than 50~60 Hz is not visible to the eye because of persistence of vision; this is why you see a steady picture on your TV. Do you have a link to where you read that claim?
  14. KrisBlueNZ

    Make a "blinker" for LED panel?

    Yes, I saw the video. Is a blinking light supposed to have a therapeutic effect? What is the name of this effect? You know that blinking lights can trigger seizures in people with epilepsy, and even sometimes in people who DON'T have epilepsy? You'll probably need to modify the panel...
  15. KrisBlueNZ

    Make a "blinker" for LED panel?

    Have you ordered the panel? When it arrives, open it up and take some close-up photos of the electronics inside, and post them here. We may be able to help. Do you have any experience with electronic circuit construction? Do you have experience working with AC-mains-powered circuitry? There are...
  16. KrisBlueNZ

    Help needed to make 555 timer circuit throw relay.

    That circuit should work. Also, the 555 can source and sink 200 mA so it should be able to drive the relay coil directly. You should ALWAYS put a diode across the relay coil (see BobK's explanation). I'm not sure what you're doing wrong, but it COULD be that your 555 circuit is only...
  17. KrisBlueNZ

    Hissing in ATX power supply.

    Good work kc1fx. Merry Christmas to you too :-)
  18. KrisBlueNZ

    Treble bleed mod.. which one is the best?

    Thanks Yoa01. Sorry I was rather scathing to you. I like your attitude. You were very restrained in your responses. That's something I try to do myself. Re Mouser vs. Digikey, from my limited experience, it seems that Mouser have a wider range of different types of components than Digikey, and...
  19. KrisBlueNZ

    Treble bleed mod.. which one is the best?

    LOL! Actually, I've apologised on the internet before. I think the damage is only localised, and the internet's self-repairing properties kick in. Soon enough, the insults are flying just like normal. I suppose it's possible that the inductance of the pickup coils is forming a tuned circuit...
  20. KrisBlueNZ

    Treble bleed mod.. which one is the best?

    Hi Yoa01, Yes, I did show a bit of a bad attitude in my previous post. I get irritated when advice is posted that sounds plausible but is "wide of the mark". The more widely off-the-mark the information is, and the more consistently it is wrong or misleading, the more irritated I get. I try...
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