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determining diodes/transistors for project

Discussion in 'Electronic Basics' started by [email protected], Oct 30, 2005.

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  1. Guest

    Alright... any help would be GLADLY appreciated... I'm trying to figure
    out how to decide what diodes and transistors to use in projects...
    what factors do I need to look at to make these decisions. thanks
     
  2. John G

    John G Guest


    The quick answer is ... Electronics 101 starts at you nearest teaching
    institution next year.

    You have to understand a lot of electronics to pick the devices you need
    so before that you will have to rely on circuits designed by people with
    the required experience.
     
  3. Andrew Holme

    Andrew Holme Guest

    Just a few:

    Speed
    Junction capacitance
    Gain
    Power dissipation capability
    Current handling capacity
    Junction breakdown voltages
    Physical size
    Price / availability

    Some are more important than others - depending on the application.
     
  4. Bob Masta

    Bob Masta Guest

    You can probably get by with a surprisingly small number of
    different types that you can keep on hand for "general purpose"
    applications. For example, 2N3904 and 2N3906 transistors
    for small-signal applications, 1N914 signal diodes, 1N4001-1N4004
    (last digit is for voltage range) small rectifiers. I expect others
    on this list will have their own personal favorites, but these will
    go a long way to getting you started. When you see a circuit
    design that does something "exotic" (like RF or high power),
    you can observe what devices are used for such purposes,
    and just go out and get those exact parts until you have
    enough experience to judge for yourself.


    Best regards.


    Bob Masta
    dqatechATdaqartaDOTcom

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Home of DaqGen, the FREEWARE signal generator
     
  5. The_Truth

    The_Truth Guest

    well, I plan on starting as of january... but electronics comes natural
    to me... I just don't understand how to judge what needs to be used...
    I mean... I know there are different types of transistors... switching,
    amplification... etc... I just don't understand the difference in
    operation well enough to decide "what" to use.
     
  6. How does electronics come "natural"?

    Tom
     
  7. The_Truth

    The_Truth Guest

    because I've worked with electronics since I was 5... I have just
    recently started trying to create circuits... ;-D
     
  8. Rob B.

    Rob B. Guest

    and now that you have turned 6 ;)
    you are ready for circuit design
     
  9. Well, I did, with my Dad for starters, and later on my own, since I
    was a kid too, but when I studied for my EET there was nothing natural
    about it - it was hard work.

    Tom
     
  10. The_Truth

    The_Truth Guest

    well... dad is an HVAC tech... so I know basics from him... but I'm
    trying to get a head start on the college portion... (HVAC is a bit
    different... you just "know" that the capacitor infront of you will get
    you good... and if you don't... you will as soon as you touch it...:-D )
     
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