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Scott S

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Posts posted by Scott S

  3. LED Necklace

    in Electronic Projects Design/Ideas

    Posted

    nevermind, I figured it out, but it is somewhat "blurry". would a peak detector help this ?
    Can you reccomend a peak detecting circuit ?
    Where would I attach it ?
    Also I notice that as I turn the volume up, the leds get brighter.
    Is there a way to adjust this so that it would be as bright at listening volume as they are on max volume ?
    I plan using a splitter and listening while it blinks.

    Thanks for your help

  4. LED Necklace

    in Electronic Projects Design/Ideas

    Posted

    I can't get it working. I'm trying the left channel with only one led, trying to start small. Everything seems to be connected correctly. I'll list the components I'm using, maybe one isn't correct. 35v 10uf cap, 2n3904 npn, a 22 ohm resistor, 150 ohm resistor, and a IN4003 diode. Is there any common noob mistakes that I may be making ?

    Thank you for your time.

  7. LED Necklace

    in Electronic Projects Design/Ideas

    Posted

    The voltage is at 6 volts, and the main resistors are 22 ohms. The two capacitors arer also 10 uf, like you suggested. So, the olnly thing I have to change is the resistors in front of the leds ? Also do I have the ground connected correctly ? I wasn't sure if that was where it went or not.

    Thanks for your time.

  9. LED Necklace

    in Electronic Projects Design/Ideas

    Posted

    Wouldn't the 7.5 volt circuit last just as long as a 6 volt one ? The 7.5v draws 200mA, the 6v draws 400mA. 7.5v: 200mA drawn until 6v would last roughly 4 hours. 6v: 400mA drawn until 3v would also last roughly 4 hours. I'm not trying to start an arguement, just trying to point that out.

  12. LED Necklace

    in Electronic Projects Design/Ideas

    Posted

    I have attached an updated circuit. Is everything correct in the schematic ? Is there anything i can do to the circuit to have the leds blink at listening volume as they would blairing, as I would like to attach a splitter so I can listen to headphones while it blinks ? I found a few "simple" peak detector circuits. If I decide to use one, would I put it before the capacitor ? I would use 2 of them, correct ? Would the results of the peak detector be worth installing it ?
    Also, would either the 2N3904 or the 2N4401 transistors work ?

    Thank you for your time, I really appreciate it.

    post-52318-14279144187931_thumb.jpg

  14. LED Necklace

    in Electronic Projects Design/Ideas

    Posted

    I found 2 transistors that are similar to the BC548 in your schematic, the 2N3904 and 2N4401. The only difference between the two, that I could find, is the collector current. The collector current of the 2N3904 is 200mA, while the collector current of the 2N4401 is 600mA. Would it be better to have a higher or lower collector current ? Another noob question: What is the importance of capicators ? 
    Here is a schematic I made. http://www.flickr.com/photos/51872883@N08/4769178237/
    Is this correct, or is there something i forgot to do ?

    Thanks for helping

  22. LED Necklace

    in Electronic Projects Design/Ideas

    Posted

    I am in the process of designing a necklace with about  20 leds, give or take a few. Thats all fine and dandy. I am trying to design the necklace so tha the LEDs will light in response to music. The music wil come from an mp3 player, via a stereo cable. I am having trouble designing a circuit that dosen't take much space, and will accoplish the goal of blinking the leds in response to the music. It would be nice to have the leds get brighter as the music got louder, if possible.
    The circuit will be eitther be powered by AA  batteries or 3v 2032 bats, not sure yet. Half of the LEDS will be white, and the other half will be blue. Also i was thinking of putting clear beads over the leds. Would this wash out too much of the color from the leds ?  One more thing, would it be better to use a cat5 ethernet cable or speaker wire ?
    Can anyone help me design this necklace ?
    Thanks
    Scott

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