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  1. R

    Assistance with Transistor Theory

    hevans1944, I was not thinking about exotic BJT's like hetrojunctions--just silicon. I hate scrounging and home-brewing, although I used to do it when I had to. No more. Fortunately nowadays, I am in a better financial position where I don't need to do that anymore. There is plenty to learn...
  2. R

    Assistance with Transistor Theory

    That would be off topic with respect to this thread, which is about how BJT's work. I would have to study up on your suggstion, because I don't pretend to be knowledgeable with every application using a BJT. But if you start another thread, I will see what I can do. However, I don't think a...
  3. R

    Assistance with Transistor Theory

    I think I brought up some new points, and I am willing to defend them. Ratch
  4. R

    Assistance with Transistor Theory

    To the Ineffable All, Let me invite and suggest everyone peruse the follow link, entries #2 and #10. Good and interesting stuff. http://cr4.globalspec.com/thread/68055/voltage-vs-current Ratch
  5. R

    Assistance with Transistor Theory

    Laywah, Why is the emitter on an NPN transistor conned to ground? The arrow points in the wrong direction for what I understand electricity travels from negative to Positive. When you talk about the "direction of electricity" you must mean the direction the charges flow. The charges move...
  6. R

    How Transistors Work

    The Vbe is the cause of Ic in the active region. A Vbe of 1 volt will probably cause saturation, which is not operation in the active region. Ratch
  7. R

    How Transistors Work

    Both studies are useful in any electronics forum. Understanding how something works can be profitable, too. I think you were too dismissive of that fact. The h-parameter model is not the only model used in design. There are voltage models that can be used, too. Ratch
  8. R

    How Transistors Work

    The energy to concentrate a charge divided by the charge itself is the definition of voltage (joules/coulomb). In a capacitor, a voltage can be present without any current. In an open wire where no net current is present, a magnetic field can increase the energy difference of the electrons...
  9. R

    How Transistors Work

    I do believe your are confusing methods of circuit design with the physics of BJT operation. I have never advocated getting involved with the internals of the BJT and using the highly nonlinear relationship of Vbe to Ib and Ic to design circuits. Of course you use models to expedite design. I...
  10. R

    How Transistors Work

    *steve*, Yes, Ic is exponentially related to Vbe. So is Ib. Therefore, Ic and Ib are directly related to each other (beta). However, you cannot explain how Ib influences Ic, because it does not. But, both Ic and Ib can be explained in terms of Vbe. You can model a BJT in terms of current...
  11. R

    How Transistors Work

    That site is heresy at Physics Forms, and the moderators there are scared that some newbie will read it and deviate from the party line dogma of current control. Therefore, they suppress any reference to Beaty's site. I am familar with the site, and I believe it is mostly correct. About the...
  12. R

    [free energy] is there hidden power in plain sight?

    Before you can discuss magnetics, you have to get your definitions straight. For MKS, magnetic flux is measured in webers, magnetic flux density is flux/area or webers/square meter or teslas, magnetization is amp-turns/meter. No such thing as "flux capacity". Electromagnets do not form...
  13. R

    Simple circuit analysis

    Use the voltage divider method, and you will only have to write one equation. Ratch
  14. R

    De-Morgans law / Nand gates.. I'm left a bit confused

    Implementing any logic circuit with all NAND or NOR gates is a cut and dried process that just about any good logic book can show. The program in the attachment breaks down a logic expression into minterms. This enables you to see if your new implementation matches the original problem. Be...
  15. R

    Coulomb's Law in practical life!

    That is the formula for two point charges separated by a distance. If you want the force of a point and a line of charge, or a point and a plane of charge, that is a different formula. Ratch
  16. R

    charge carrier transport in semiconductor

    It depends on the type of semiconductor, ie., N-type or P-type. Yes, that is basic knowledge. No, holes do not generate electron-hole pairs. Thermal energy and recombination-generation (R-G centers) do. Or even one charge carrier. It depends on what you mean by "statics". Ratch
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    Physics of n-p Junction in a diode

    Why would a 0.0001 unit change of a 0.001 unit change be remarkable? That is true. However, in a transistor, the base-collector depletion layer is intruding into the already very thin physical base layer, and changing the electrical characteristics of the transistor. Since the length of the...
  18. R

    Physics of n-p Junction in a diode

    I do remember that you agree that Vbe controls the collector current, not the Ib. I used Vbe-Ic as an example of how a correlation of one parameter does not necessarily mean that this parameter controls a different one, I did not say you denied the example I used. As for the depletion region...
  19. R

    Physics of n-p Junction in a diode

    Yes, it would. That proposition is similar to the wrong belief that the base current of a BJT controls the collector current. The base current is an indicator of the collector current, not the cause. Voltage controls and causes current provided there is a conduction path. You can have...
  20. R

    Understanding the nature of the electric field

    If a field had a zero value, then it would not be a field, would it? What is this "lattice" you are talking about? You have to define your terms. Propagating fields can move toward to infinity until they become so weak that for practical purposes they are nonexistent. Complete emptiness...
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