Choose an npn transistor newbie

Discussion in 'General Electronics Chat' started by bulletprasath, May 28, 2011.

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  1. bulletprasath

    Thread Starter New Member

    May 28, 2011
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    Refer Circuit fig below. I replaced 33k R with 100k pot, 100uF with 1000, 220R with 470R, source 14.4V

    Flashing of 1 led did happen . But when i connected it to an array of 5(series) X 8 in total 40 led. Voltage dropped across output, only max of 10 led flashed and later on npn failed, tested with multimeter no reading . now its not flashing, glows steady.

    Plz suggest me " Capacitor and NPN " that can handle more, Or any modification in circuit . amp used by array is 250 mA and 3012 mW

    I have attached circuit fig. source for this project is throbbing led

    [​IMG]
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,649
    2,348
    Hello,

    You just hijacked an existing thread:
    How to choose NPN transistor

    Besides the topic is not for discussion on this forum:

    Quote:
    6. Restricted topics. The following topics are regularly raised however are considered “off-topic” at all times and will results in Your thread being closed without question:

    • Any kind of over-unity devices and systems
    • Automotive modifications
    • Devices designed to electrocute or shock another person
    • LEDs to mains
    • Phone jammers
    • Rail guns and high-energy projectile devices
    • Transformer-less power supplies
    This comes from our Tos:
    Terms of Service
    There will be enough sites where automotive questions can be discussed :
    Member selected automotive forums

    If you start again we will have to ban you.

    This was your other closed thread:
    [​IMG] i need npn transistor that works (newbie)


    Bertus
     
    bulletprasath likes this.
  3. bertus

    Administrator

    Apr 5, 2008
    15,649
    2,348
    Hello,

    I got this in an email from you:

    In your first post you stated the motorbike.
    That thread is closed by beenthere.
    The second you tried to "hide" the bike, but the rest is completely the same.

    There are to many mistakes in the circuit you show to have it working.

    Bertus
     
    bulletprasath likes this.
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