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  1. 03-05-2013 #6
    C_Bubba's Avatar
    Lives in LaGrange, GA USA, United States.
    C_Bubba
    Last Activity: 6 Days Ago Has been a member for 9-10 years. Has a total post count of 78. Received thanks 10 times, giving thanks to others 2 times.
    fivetide,
    I looked at your schematic to find the part number BD139 and then did a google on that number. This is an industry standard part number. HOWEVER, I just looked up the part number you referenced above and it is a 2N3904.
    Now looking at its pinout, and I can see the confusion!. It indeed does have the base in the center pin! You need to change the part no in your schematic to the correct one for the transistor that you have.
    Here is the url to the cut sheet that I have ref'd:
    http://www.fairchildsemi.com/ds/2N/2N3904.pdf

    HTH
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