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  1. (*steve*)

    Transistor Analysis

    They are the ones inside the biased transistor packages.
  2. (*steve*)

    Problem with differential amplifier with BJT

    You don't need to concern yourself with the voltages. What is the identity expressing the current flows in base, emitter, and collector?
  3. (*steve*)

    Power Dissipation Across A Transistor In Cutoff

    Well, you now know that there are two valid ranges of voltages which should appear between the emitter and the base(ish) terminal. First find out what range of input voltages cause these to happen. Then ensure that the other transistors remain in the valid on and off state throughout these...
  4. (*steve*)

    Problem with differential amplifier with BJT

    That would seem right to me. And it's obvious what Ve for Q1 is as well, right? Put that aside for a moment. Can you calculate what the sum of the collector currents are? It's OK to leave a couple of unknowns in there. (hint: what is the equation which defines the current through one...
  5. (*steve*)

    Peltier module problem?

    Does one side get hot and the other cold when power is being applied? Has it been subjected to unusual shocks (e.g. being dropped)? Depending on what you're using them for, Peltiers can be very efficient (for heating) and very simple.
  6. (*steve*)

    Problem with differential amplifier with BJT

    OK... I'm not sure I understand your point. I'm trying (unless the phone autocorrects my posts) to use the same terminology as that used in your first post. So, given you know what Vbe is, and the voltage on the base, can you subtract one from the other?
  7. (*steve*)

    Power Dissipation Across A Transistor In Cutoff

    The on state voltage is the minimum voltage which must be applied to the input terminal (the "base") with respect to the emitter terminal to cause the on-state as defined in the datasheet to be achieved. The off state voltage is the maximum voltage which can be applied to the input terminal...
  8. (*steve*)

    Problem with differential amplifier with BJT

    Let me put it more clearly. You are given the voltage on the base of Q2. You are told what you should assume Vbe to be. The voltage on the emitter of Q2 is the result of subtracting one of these from the other.
  9. (*steve*)

    Problem with differential amplifier with BJT

    Do you know the voltage on the base of Q2? Are you told what you should assume Vbe is? Can you calculate the voltage on the emitter of Q2 now?
  10. (*steve*)

    I need a voltage follower with >= 1Amp output for experiments

    That requires both voltage sources to have some internal resistance and the feature of having the voltage drop as charge is removed, and voltage rising when charge is added. Those features are not those of a theoretical voltage source, not are they what you see from a voltage regulator. I...
  11. (*steve*)

    Problem with differential amplifier with BJT

    Can you calculate the voltage on the emitter of Q2?
  12. (*steve*)

    Power Dissipation Across A Transistor In Cutoff

    See page 7 of the datasheet. See figure 6 on page 8. Even if it's a transistor, the base current doesn't determine the collector current. These devices are designed for use with digital inputs. The behavior is defined for input voltage above some value and below another. The presence of...
  13. (*steve*)

    Restoring a Regal Do-Wa-Diddy by fOXX

    Resistors firing? Do you know what resistors do?
  14. (*steve*)

    Pavilion 560w MB w/bulging caps

    We use English in this forum. I tried placing your post in Google translate but it couldn't determine what language you are using. Can you please post using terms that make sense to those of us trying to help you.
  15. (*steve*)

    I need a voltage follower with >= 1Amp output for experiments

    That doesn't make sense. Two voltage sources in parallel will cause zero current to flow if they have the same voltage and an infinite current (and an undefined voltage) if the voltage are different. To make sense of your question we have to assume some properties additional to a perfect...
  16. (*steve*)

    Transistor Analysis

    That's not just a transistor. Much of what has been started in this threat does not apply to that device. If you can change it to a normal transistor, or go back to the thread where we were discussing this circuit we may be able to help you with your homework. Also, please place your homework...
  17. (*steve*)

    Power Dissipation Across A Transistor In Cutoff

    Because they're not just a transistor.
  18. (*steve*)

    Can anybody explain about how bjt works??

    At which point you're discussing how particular circuits using transistors work, the same applies to other devices such as MOSFETs, jfets, and even vacuum tubes.
  19. (*steve*)

    Micronta VOM

    Remember that Trimmer is rated for the power dispassion across the entire track. Use I = sqrt(R/P) to determine the max current it should be allowed to pass.
  20. (*steve*)

    Problem with differential amplifier with BJT

    Can you calculate the voltage on the emitter of Q2? Can you calculate the total of the IC values? Can you calculate the desired Ic for Q1? The rest should be obvious.
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