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  1. globecollector

    3W LED dimmer

    Oh, just another quick comment...you need to provide a PWM signal to this chip to dim the LEDs, so you will need to build a separate PWM circuit...it will need a regulated supply voltage, so use the DC-DC Boost converter for this. Follow all the design tips for this chip...
  2. globecollector

    3W LED dimmer

    Oh, Takeshi....nice to finally "meet" you. Finally all the irrelevant guf and "smart" remarks about negative resistors are under the carpet we can talk "tin tacks". If you choose PWM, it is actually "easier" than you think....I will try to explain. You could build a PWM "chopper" circuit...
  3. globecollector

    3W LED dimmer

    I am an Australian, I am a scientist, I am a light "bulb" collector.. Whenever legal courts and litigation are mentioned, particularly where they make one so fearful to experiment and learn....and degrade one's trust in one's own common sense, (if that has not yet been bashed out of all of...
  4. globecollector

    3W LED dimmer

    365nm is not really that dangerous....the danger lies in sources that emit this wavelength but no visible light, which means that if one stares at the source, one's iris will not stop down is quite a bit of it reaches the retina. It does, however make the cornea fluoresce which creates a sense...
  5. globecollector

    3W LED dimmer

    I think we need to get right back to basics,,,,firstly L.E.D.'s are current devices, you allow a current to flow through them and they develop their own voltage drop which is fairly independent of the current flow. The voltage drop they develop is determined by the type of semiconducting...
  6. globecollector

    How does a 110v portable generator with brushes generate electricity?

    Thanks for your congratulatory comment heavens1944. Yes, marginal design...in anything, not just electronic stuff frustrates me to the point of scalping myself. That "built down to a price not up to a standard" drives me nuts because I can see that a tiny bit of effort at the design stage...
  7. globecollector

    How does a 110v portable generator with brushes generate electricity?

    About a decade ago I used to help a local electrical technician work on all manner of things. He was very proficient with series wound motors in power tools and was decidedly "old school" and knew his rotary machine stuff very well and was good with the mechanical aspects. Sometimes we worked on...
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