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  1. KJ6EAD

    Newbie: Resisters and LEDs

    You need to understand that LEDs are current dependent devices; too little gets you no light and too much gets you light for a short time. You've already experimentally confirmed the latter. Your LEDs might start lighting with just a few mA of current and their upper limit at normal air...
  2. KJ6EAD

    Determining DC adapter

    That's a symbol frequently used to indicate the polarity of a coaxial DC power plug or jack. In your example the center pin is positive.
  3. KJ6EAD

    LED lighting for a camper with 12dcV power

    Try running one of those Ningbo lights with a panel of 24 LEDs wired in parallel at 480mA and tell me what happens. Hint: you'll need an oven mitt.
  4. KJ6EAD

    LED lighting for a camper with 12dcV power

    Save yourself a headache and avoid cheap Chinese LED lights. Even if you use a current regulated supply, the LEDs will generate lots of heat. They build enough resistance into the LEDs to allow them to get away with placing large numbers of LEDs in parallel; something that's normally considered...
  5. KJ6EAD

    fixing and AVR speaker switch

    The switch you have is not standard stock. It has 2 poles (one for each audio channel) on opposite sides of the disk with 4 throws each.
  6. KJ6EAD

    fixing and AVR speaker switch

    As it probably was a custom production run for Sony, only they or ALPS or one of their authorized service providers would know. This switch or one like it was used on many Sony receivers so perhaps you can scrounge one from a dead unit or a thrift store. What's the complete receiver model #...
  7. KJ6EAD

    noob need help identifyng resistor

    You're correct on the values. That last black band on the 160 Ohm resistor indicates a 250ppm temperature coefficient. Obviously the photo is not of the damaged board, just one like it.
  8. KJ6EAD

    Light circuit for an art project

    Unfortunately, the Vf of typical 470nm blue LEDs is a little too high to get away with series strings of three considering that the battery is at 10.5V at the end of it's discharge. The best solution if it can be done is to start with a much higher supply voltage either by using a boost...
  9. KJ6EAD

    Why no sequential post #'s?

    Interesting, the link to the post appears to be independent of the thread (a permalink) since there's no thread # in it. Only you can verify that though.
  10. KJ6EAD

    Light circuit for an art project

    Current limiting; PWM would only have been necessary if you wanted to change the brightness gradually during viewing. Your description of your project makes it clear that diffuse LEDs would be a better option than clear ones, perhaps in more than one size if you're representing large and...
  11. KJ6EAD

    Why no sequential post #'s?

    Post #8* You make your point effectively with your evil post and the link to the merged duplicate thread. *Post number is tentative and may become erroneous at any time due to the evil actions of the Super Moderator. KJ6EAD takes no responsibility for any damage, direct or consequential that...
  12. KJ6EAD

    Light circuit for an art project

    For an art project, viewing angle may be an important consideration. While a grain of wheat light bulb will have a similar point-of-light appearance from all angles except through the base and leads, an LED is an inherently directional source. How directional varies from one to another but...
  13. KJ6EAD

    Why no sequential post #'s?

    Post #4 I appreciate the explanation, Steve but still would prefer numbered posts. I don't think I've ever encountered a merged thread but I've seen plenty of threads with whole posts repeatedly requoted, a practice that I find a little annoying. I suppose that in some improved future...
  14. KJ6EAD

    Ionic Breeze Repair

    If I saw a picture of this mythical wire, I might have a notion what it is and what can be had to replace it. Have you measured the diameter?
  15. KJ6EAD

    5-PIN DIN Adapter

    http://products.cui.com/adtemplate.asp?invky=456402&brand=electronic-components&catky=619701&subcatky1=90878&subcatky2=223110&subcatky3=703044 http://products.cui.com/adtemplate.asp?invky=716289&brand=electronic-components&catky=619701&subcatky1=90878&subcatky2=223110&subcatky3=249798...
  16. KJ6EAD

    What is this component?

    Diode color code chart: http://www.crystalradio.net/cal/diodeid.shtml
  17. KJ6EAD

    Just worked out how to rid cancer forever...

    I do like the idea of a pre-date test. I'm thinking of a date application form with questions on electronic theory, knot tying and song identification. ;)
  18. KJ6EAD

    Why no sequential post #'s?

    Begin post #1 What's the matter with you people!? ;) I know vB supports numbering. It's very useful when referring to a previous post in a thread to not have to resort to some convoluted descriptive phraseology. End post #1 :D
  19. KJ6EAD

    MAKE: Electronics Ex. 10 Help Needed

    You have a couple of jumpers connected from one point on a bus strip to another on the same bus strip. These serve no purpose since the bus strips are continuous the length of the breadboard as shown in Tim's first post. This is not obvious since the holes along the bus are separated into groups...
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