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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by mxracer700

  1. M

    LED circuit issue

    Thanks guys for all the replies and the knowledge that came with them! When I got into trouble I jumped online and picked this forum because it seemed like smart and generous people inhabited it. I was right. My project is done and working great. Merry Christmas and if you don't go in for that...
  2. M

    LED circuit issue

    Hi Diver, Thanks for explaining that! Yes the calc (don't know which one but did a few to be sure) did not suggest 3 was not good. As I played with them entering different values to learn it was only when I exceeded the supply voltage with LED voltage did it kick it back and say use less LED's...
  3. M

    LED circuit issue

    Mike, that's an awesome reply and one I can easily understand. Thanks! 1.Did you base your calc on the 3.6v or the 4.0v for the resistor values? 2. That chart really illustrates the batteries inability to deliver current as the voltage drops off. Didn't realize it's as dramatic as it is. I...
  4. M

    LED circuit issue

    Thanks Mosaic! You are way beyond my knowledge with that answer but I wanted to let you know I appreciated it none the less!
  5. M

    LED circuit issue

    Thanks Mike that now makes sense to me. I will do as you say and I'm sure it will be fine. These LED are sold by a local chain of electronic supply stores called Sayal. The brand is Knight Lites and I can't find a spec sheet on them as even their own website is down. Individually packaged the...
  6. M

    LED circuit issue

    Okay thanks Mike, 100% I need resistors. Struggling to understand why one set keeps running with no resistor and the other does not. Also why with the correct (seemingly) resistor the first set blew at all?
  7. M

    LED circuit issue

    Hi All, Thanks in advance to anyone who can shed some light here. Building a simple circuit to add LED headlights a child's battery ride on car. Each headlight has 3 white 10mm water clear LED wired in series. (20,000mcd,4.0v, 20ma) each for a combined draw of 12v. There is parallel wiring...
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