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How does a transistor amplify current or voltage?

Discussion in 'General Electronics Chat' started by jac4b, Jul 23, 2010.

  1. rt of az

    rt of az New Member

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    I meant the approach by 4pyros and MrAl is the best.
     
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  2. 4pyros

    4pyros Well-Known Member Most Helpful Member

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    Well thank you.
     
  3. tvtech

    tvtech Well-Known Member Most Helpful Member

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    And gracious and humble too. And you did the 1000Ft tower climb as well. A few times.

    Awesomeness always leaves me gobsmacked. People that do stuff and don't brag I automatically aspire to.

    So glad to have your acquaintance. You are a good person.

    Regards,
    tvtech
     
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  4. dave

    Dave New Member

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  5. Ratchit

    Ratchit Well-Known Member

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    4pyros,

    "I think if new people to electronics stop thinking of transistors as amps and more like switches there would be a lot less confusion."

    A BJT is an analog transconductance device, not a switch. It can be incorporated into a circuit that acts like a switch, but it does not have intrinsic on-off characteristics like a contact switch does.

    Ratch
     
  6. tvtech

    tvtech Well-Known Member Most Helpful Member

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    ^^^ I still love you Ratch

    Still me tvtech :wideyed:

    I never change. I might disagree with the way you do stuff...but I always learn :)

    As long as I keep being a good person, as poor as I am...I am OK.

    I just know you are going to quote this...I know you by now. Hence few words :wideyed:

    LOL :)Gotcha..

    tvtech
     
  7. nsaspook

    nsaspook Well-Known Member

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    Nobody condemns these statements but they are extremely simplistic. It's like saying a plane is just a mechanical bird because they both fly. The 'variable' part of the 'resistance' is where the action is at. The 'how' and 'why' of that variation is what people spend years studying.
     
  8. tvtech

    tvtech Well-Known Member Most Helpful Member

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    I love interesting people.

    In the period of around 48 Hours I have met TWO top class people that hang out here....that have a a sense of humor too...

    Never speak much..say little here..but have confidence in their ability....therefore time to play too...

    Humor....how do you define it?. People that are Technical and know what they are doing and are working and are relying on their ability to cut it...will find time to play. As stressed as their day is..they make the time.

    First of all ypyros..you were the one that shall I say "helped me back in" here at ETO a while back...no airs and graces..you knew it was me..and played along. An EE being a sport. Found time for fun as did Matt, Ian, Nigel and other Mods that maybe were aware of it. I will never ever forget that.
    I have lots more to say and be happy about.

    Secondly, naspook
    I never knew you knew stuff. You also don't talk much. Last night you loosened up a little. So good to see.

    Thirdly...not covered above is SteveB
    Works his butt off helping all and sundry. Steve is the Forum leader. But no fun. Work, work, work kills.

    OK. Before all of you get pissed off with me..and start thinking of throwing things at me...I am talking about new interesting developments/people.

    Yes I know KISS you have slaved away. I know Ron has. I know Ratchit has too (more bottles).

    Humor. Common, somebody has to do this.

    Now you can ban me. I will take my little bag with all my possessions and sit across the road.

    And play Chess again.

    Love you all
    tvtech
     
  9. 4pyros

    4pyros Well-Known Member Most Helpful Member

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    Now you are just confusing things
     
  10. 4pyros

    4pyros Well-Known Member Most Helpful Member

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    We love you to Pal.
     
  11. Ratchit

    Ratchit Well-Known Member

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    4pyros,

    "Now you are just confusing things"

    Nope, just telling it the way it is.

    Ratch
     
  12. MikeMl

    MikeMl Well-Known Member Most Helpful Member

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    We get a lot of posts on here about "energy harvesting" where the TS says something like I get 0.1V at 3uA and I want to "amplify" it to run my (house, cell phone, stereo, etc).
     
  13. 4pyros

    4pyros Well-Known Member Most Helpful Member

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    You are confusing the novices.
     
  14. 4pyros

    4pyros Well-Known Member Most Helpful Member

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    So true, all they need is an amp
     
  15. Ratchit

    Ratchit Well-Known Member

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    How do you know that? All novices? Since when has the truth about an old and mature technology confused anyone? If they don't understand something, they have only to ask.

    Ratch
     
  16. 4pyros

    4pyros Well-Known Member Most Helpful Member

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    All the time
     
  17. 4pyros

    4pyros Well-Known Member Most Helpful Member

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    And if they still don't get the concept.
     
  18. 4pyros

    4pyros Well-Known Member Most Helpful Member

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    Its called teaching.
    In the forums we have limited resources.
    Sometimes its easier for some to grasp a complicated concept if its simplified.
    Do you have a problem with that?
     
  19. Ratchit

    Ratchit Well-Known Member

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    4pyros,

    "All the time"

    Hardly ever.

    "And if they still don't get the concept."

    Ask some more.

    "Its called teaching."

    It's called explaining. We don't have the resources to teach a technical couse with a syllabus and schedule. So we explain a subset of the technology that the beginner does not understand.

    "Sometimes its easier for some to grasp a complicated concept if its simplified.
    Do you have a problem with that?"

    No, unless you fib about how something works. Like saying that the collector current of a BJT is controlled by the base current, when in fact, it is really controlled by the base-emitter voltage.

    Ratch
     
  20. 4pyros

    4pyros Well-Known Member Most Helpful Member

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    No one fibbed
     
  21. Ratchit

    Ratchit Well-Known Member

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    Didn't you suggest that a BJT could be thought of as a switch, despite the fact it is really an analog transconductance amplifer when operated within its active region?

    Ratch
     

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