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  1. stspringer

    Interesting circuit usb with 2 led lights with different brightness

    It is black epoxy there it is! pic 2
  2. stspringer

    Interesting circuit usb with 2 led lights with different brightness

    Ok I read this again "without the need for additional components." Thanks again It's up to the Asian engineer who designed the contraption how they want to do this, but two levels of brightness require two bits of "data" to implement, and in this case that would be two LEDs. Often the μP can be...
  3. stspringer

    Interesting circuit usb with 2 led lights with different brightness

    Wow, that is truly amazing. Very informative. Are there resistors in this mix too? Or is that controlled by the mp somehow? Thank you stspringer
  4. stspringer

    Interesting circuit usb with 2 led lights with different brightness

    Will do I will take it apart again and take more pics
  5. stspringer

    Interesting circuit usb with 2 led lights with different brightness

    see post #2 If the underside of the board sports a "black blob of tar like substance" then more likely than not, a microcontroller.
  6. stspringer

    Interesting circuit usb with 2 led lights with different brightness

    Hi Bluejets I looked up tactile switch it's not mechanical like that, it is just a curved piece of metal that bounces back when clicked on. like how a clicker toy works. It obviously makes contact with the pcb but I don't see any tar [Edited by moderator to clarify quoting]
  7. stspringer

    Interesting circuit usb with 2 led lights with different brightness

    Hello All, I am intrigued by how this usb, with 2 white leds of different brightness works, can anyone help me understand it. First click turns on first lower intensity led, second click turns on 2nd led with greater intensity, 3rd click turns off both led's. Notice the small metal disk with the...
  8. stspringer

    1.5 volt bulb won't light in my circuit newbie

    Thank you, Sorry I took so long to reply, I was on vacation. I understand what you are saying now and thank you for all your useful input.
  9. stspringer

    1.5 volt bulb won't light in my circuit newbie

    Thank you very helpful
  10. stspringer

    1.5 volt bulb won't light in my circuit newbie

  11. stspringer

    1.5 volt bulb won't light in my circuit newbie

    Hi all, I found a great link on this subject of lighting high powered led's with a 12 volt car battery Curious if I understand this video correctly In my circuit , if I put 3 of my 1.5 volt bulbs in series, I could then use a smaller resistor right? Please advise Thanks
  12. stspringer

    1.5 volt bulb won't light in my circuit newbie

    Thank you you explained it well
  13. stspringer

    1.5 volt bulb won't light in my circuit newbie

    Thank you to all of you for your help. I am just a hobbyist and a gadget man. I like to learn new things. I started using breadboards with led's and got them working from tutorials. I had no idea what was in store for me when I decided to try a 1.5 volt bulb to light up with a 9 volt battery...
  14. stspringer

    1.5 volt bulb won't light in my circuit newbie

    Thank you, Can you help me by explaining Bobs post,on how he found R1 value using algebra? Post #22
  15. stspringer

    1.5 volt bulb won't light in my circuit newbie

    Thank you Sir, that was helpful. I am just a hobbyist, and a gadget man, and enjoy learning new things. John
  16. stspringer

    1.5 volt bulb won't light in my circuit newbie

    Hello Bob, You gave me the best answer but I am a little confused on the math. What is the value of R1? Could you please explain your math for me I am not good at math. I know you are substituting here but I am confused. Thank you John
  17. stspringer

    1.5 volt bulb won't light in my circuit newbie

    Thank you Bob I will get a 3 watt resistor. I will study your calculations. Much appreciated
  18. stspringer

    1.5 volt bulb won't light in my circuit newbie

    Thank you Bob, The bulb lit but the 27 ohm resistor started smoking. Did I miss something? Thanks please advise
  19. stspringer

    1.5 volt bulb won't light in my circuit newbie

    I have all kinds of breadboards with led's working. I just thought I would try something with a miniature bulb and never knew it could not be done. It amazes me that it can't be done.
  20. stspringer

    1.5 volt bulb won't light in my circuit newbie

    Thank you for your reply. So I need a much smaller resistor than 10 k right? What do you suggest to make it work?
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