help with light organ using bjt

Discussion in 'Homework Help' started by ibm123, May 25, 2009.

  1. ibm123

    Thread Starter Member

    May 13, 2009
    17
    0
    hello again
    i'm tring to make some led organ..

    i got 4 leds i want each one will light on 4 diffrent frequency..

    i got the circuit but it works only if i use 4 darlington pairs

    problem is i dont have time to wire up so many

    please look at my schemetic and see if you can help me

    thank you
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    OK, lets get that picture out of the word document...

    [​IMG]

    Ever use a protoboard? It is a quick way to wire something like this.
     
  3. ibm123

    Thread Starter Member

    May 13, 2009
    17
    0
    but my professor insist that we will wire it...
    thats why i want it to be a small parts project..

    what are my options ?
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Wire one or two, to show the basic principle. Truth, it doesn't take that long, but you have to start somewhere.

    Remember, this circuit is repetitious. Besides, I've known lots of people who make projects using protoboards as the final way to do it. Expensive, but practical. It don't see how protoboards could be ruled not wireing it, it is just another form of breadboarding, same as solder.

    Suggestion, put an LED on the collector.
     
  5. ibm123

    Thread Starter Member

    May 13, 2009
    17
    0
    do you think there is a way to make it work with an volt amp ?
    like op amp or CE\CB ?
     
  6. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    A volt amp ?

    You're going to have to define that one.

    I would have done it a little different, like using a wien bridge. But there are lots of ways to do this.

    I'm also a firm believer in KISS (Keep It Simple Stupid).
     
  7. ibm123

    Thread Starter Member

    May 13, 2009
    17
    0
    i didnt learn wien bridge..
    but i will now google it

    thanks
     
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