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  1. (*steve*)

    Power Dissipation Across A Transistor In Cutoff

    I don't know, perhaps you should just say it pulls the output low. Vbe of 0.7 is not what you need to worry about. Remember that there are not just transistors. You need to use the minimum on voltage from the datasheet. Vcc5 - 0.2V from memory.
  2. (*steve*)

    Power Dissipation Across A Transistor In Cutoff

    It's really a shame you couldn't have provided some of that information earlier. I'm not sure if it affects any answers I've given, but it certainly would have helped provide more certain answers. I'm no sure you can say R200 and TM+ act as a voltage divider. It all depends on what's...
  3. (*steve*)

    Transistor Analysis

    See here for the rest of the discussion. Having 2 threads is just silly.
  4. (*steve*)

    I need help identifying an SMD capacitor and ordering 2 axial inductors

    Be careful with the orientation (they're polarised) and don't apply to much heat!
  5. (*steve*)

    I need help identifying an SMD capacitor and ordering 2 axial inductors

    The other possibility is that the tantalum failed in their usual manner (short circuit) and it took out the two inductors. It was with asking if something odd had happened to the power. That's more likely to happen again. It might be worth replacing both of those caps. It may save you if the...
  6. (*steve*)

    I need help identifying an SMD capacitor and ordering 2 axial inductors

    Inductors appear to be 2.7uH Tantalum cap 4.7uF 25V Any chance the power was connected up the wrong way? Different (wrong) power supply?
  7. (*steve*)

    Analog Circuit Outputs

    I am not a fan of excessive formality (see Peeler, Hack, et al; posts #3-6) and I think of my fellow moderator as Harald rather than Kapp. Unless you're referring to some text he has authored? :-)
  8. (*steve*)

    Self-Charging Phone Case

    Yeah, one I had simply works like one of those lithium battery powered USB power packs. They act like a charger as long as their is power in the lithium battery.
  9. (*steve*)

    DT 9205A Help

    Does it have a low battery indicator? Try replacing the battery. Otherwise it sounds like a tough one.
  10. (*steve*)

    Color Sensor

    The problems are threefold: It's a medical device so we wouldn't suggest anything invasive, or even completely obscuring the LED and providing a duplicate controlled by your circuit. Non-contact to a relatively low intensity signal in conditions of unknown and probably variable ambient...
  11. (*steve*)

    Identifying blown transistors

    My time is free to you. :-)
  12. (*steve*)

    Guidance

    I agree. This is what I typed a couple of hours ago but didn't post :( Where are you studying? (Is that where you want to work?) In what study area are there the best job opportunities? Are you vastly more interested in one career path over another? How much competition will you face in...
  13. (*steve*)

    Transistor Analysis

    However it's worth noting that the resistor values will be quite well matched in their ratio to each other. So if they're supposed to be equal, they will be very close to equal, even if their absolute value differs by a significant amount.
  14. (*steve*)

    MC34071

    If all you can find is an SMD version of this chip, solder it to an adapter board, solder 8 pins into the adapter board and then use it just like a DIL chip. I use a method similar to this when I'm breadboarding with things that only come in SMD packages.
  15. (*steve*)

    Transistor Analysis

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

    Problem with differential amplifier with BJT

    That's where we're headed. Now you have that equation, can you create an equation expressing the sum of the Ic in terms of Ib and Ie?
  17. (*steve*)

    Peltier module problem?

    Well, it seems to be working then, and by the sound of it, pretty well. Perhaps they just put a working (but lower power) module in there.
  18. (*steve*)

    Need help identifying connector type

    Wow. The last time I saw something like that it was a 20A IEC connector. I can't imagine a few LEDs would need that. Perhaps you can provide some measurements or something to show the scale (perhaps lean a ruler against the side of the box?)
  19. (*steve*)

    Power Dissipation Across A Transistor In Cutoff

    Do you remember the on state voltage and off state voltages you asked about? Them.
  20. (*steve*)

    Problem with differential amplifier with BJT

    Oh, COME ON. Ie = Ic + Ib Perhaps your girlfriend should try to do her own homework.
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