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Transistor alternative

Discussion in 'Datasheets, Manuals and Component Identification' started by Youssef13, Mar 7, 2019.

  1. Youssef13

    Youssef13

    3
    0
    Mar 7, 2019
    Hello,
    I'm in the first electrical engineering year and it's required to make an electronics project.
    I've found a pdf that contains some projects and I've chosen this project pictured below.
    The transistors T1 & T2 are BC547B
    In the market I found BC547, is it equivalent to BC547B ?
    and for the T3 (BEL187-P) I can't find it in the market, what is the alternative ?
    upload_2019-3-7_17-13-26.png
     
  2. Bluejets

    Bluejets

    3,374
    678
    Oct 5, 2014
    Anything using a 3 to 10v bulb has to be ancient even for someone like me and I'm retired.
    I'd say use the same arrangement and any npn transistor such as the bc327 and in place of the bulb put an LED and resistor.
     
  3. Youssef13

    Youssef13

    3
    0
    Mar 7, 2019
    Thanks for your reply
    Yes, I'll use a led and resistor.
    so I can just replace the BEL187 with BC327 ?
    but I think BEL187 is npn and BC327 is pnp ?
     
  4. Audioguru

    Audioguru

    2,480
    550
    Sep 24, 2016
    You probably will not find the datasheet of an antique BEL187 which was from India.
    The transistor symbols on the schematic show NPN, I do not know why you were told to use a BC327 which is PNP.
    Since an ordinary 5mm LED uses only 20mA then BC547 transistors will work fine for all three in that circuit.
     
    Cannonball likes this.
  5. Bluejets

    Bluejets

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    Oct 5, 2014
    Slip-up.
    Some normal people have them from time to time.
     
  6. Youssef13

    Youssef13

    3
    0
    Mar 7, 2019
    Thanks for your help @Audioguru & @Bluejets
    I'm going to try the circuit on a breadboard soon :)
     
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