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  1. HANKMARS

    Transistor as a switch

    Hi. I forgot to ask if you received any suitable info or explanations that helped answer your question or understanding of transistor operation.
  2. HANKMARS

    Transistor as a switch

    OH, no doubt brother. I'm going to have to back out of this discussion. I think the initial query concerned using a transistor as a switch and how the term saturation entered into the practice of transistor switches. It's been a slice but the subject has veered off to rather trivial threads of...
  3. HANKMARS

    Transistor as a switch

    According to Wikipedia, Sydney Darlington devised the Darlington pair transistor configuration in 1953.
  4. HANKMARS

    Transistor as a switch

    I wondered about that but couldn't draw it out into a mental image that seemed workable. Also the few I have observed had two individual dies of equal (nearly) size. I'm still a little hazy on the interconnects. The base lead (let's say Q1) attaches to small pad which is surrounded by emitter of...
  5. HANKMARS

    Transistor as a switch

    Maybe the wire bonders could not locate the wiring diagram so they just took their best shot. Wonder where they are working today.
  6. HANKMARS

    Transistor as a switch

    But a darlington will have two individual die contained in a single package.
  7. HANKMARS

    Transistor as a switch

    By definition:
  8. HANKMARS

    Transistor as a switch

    I going to suggest that a darlington transistor will more resemble this device. This piece they said is counterfeit but its physical layout more matches my mental concept of a darlington. The way this device appears to be wired, it looks like two transistors in parallel.
  9. HANKMARS

    Transistor as a switch

    Used almost exclusively in prototyping around my shed merely to prove theory of operation of untested circuits. If it works using a 3055, it will work with a rock with some wire wrapped around it. It did take more than the destruction of one unit to clue me in that trying to operate at nearly...
  10. HANKMARS

    Transistor as a switch

    I see only 3 elements on the die. Bottom little square is base, upper larger fingers are emitter and collector is connected to can. Doesn't meet the definition of 2 transistors. ICBM (I could be mistaken)
  11. HANKMARS

    Transistor as a switch

    Righto, but I could get 100 - 3055s for $40. Hurts less when they go to smoke.
  12. HANKMARS

    Transistor as a switch

    One representation:
  13. HANKMARS

    Transistor as a switch

    I'll guess because the cascaded pair of transistors configuration was designed before the term Integrated Circuit was coined.
  14. HANKMARS

    Transistor as a switch

    The reason I consider beta dc is because of test set up that gives graphic representation of beta lines. And I spose a wantingness that hF = high frequency. I have no empirical evidence on hand though.
  15. HANKMARS

    Transistor as a switch

    The proof is in the can. If it were a Darlington, there would be 2 dies in there. This is a great discussion and I have some questions related directly to very similar topics. I would prefer to open this discussion in a new thread. I initially entered this thread to offer my understanding as...
  16. HANKMARS

    Transistor as a switch

    First off I am truly surprised that the 2n3055 is not a darlington. Not sure how I got that confused. Second, let's say I may have been trying to deliver 14A with a 2n3055. What would be your estimate of required base voltage? If I had been trying to work near max Ic then I probably looked at...
  17. HANKMARS

    Transistor as a switch

    The definition I posted in post #63, According to the definition I used in post #63, the answer is no.
  18. HANKMARS

    Transistor as a switch

    The above snip from the net is the only evidence that I can produce at this moment. And in reality if I presented this info to bolster my argument in front of an unbiased jury with no prior electronics experience, they could very well decide that the only proof here is that there is one other...
  19. HANKMARS

    Transistor as a switch

    If you have a 2N2222 transistor that begins to conduct at 0.45 V on the base in reference to emitter V, I would conclude that you purchase your electronic devices at Radio Shack. Radio Shack, "Utilizing the floor sweepings of the world."
  20. HANKMARS

    Transistor as a switch

    RE: Term saturation. If I had a device which utilized a heating element that was difficult to 'hands on' access, and was not delivering the required temperature in the heating chamber and inhibiting proper function of the device, it would be a logical troubleshooting step to take the machine to...
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