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  1. R

    Vacation

    Tomorrow, 7/9/18 I will on the road for a two week vacation visiting some friends in Las Vegas, NV. I'll check in when I get back Ratch
  2. R

    np=ni^2 in doped semiconductors

    I believe I answered your question in post #5 of this thread. What do you not understand about that explanation? Ratch
  3. R

    Question about implementing (boolean) function using multiplexer?

    Boolean expression not fully reduced. A'B'+ABC'+AB'D=A'B'+ABC'+B'D because A'B'+ABC'+AB'D = A'B'(1+D)+ABC'+AB'D= A'B'+A'B'D+ABC'+AB'D= A'B'+ABC'+A'B'D+AB'D= A'B'+ABC'+B'D(A+A')= A'B'+ABC'+B'D Ratch
  4. R

    icircuit

    We will be duplicating other efforts to help you because you are posting this question on other sites/ https://www.electro-tech-online.com/threads/icircuit.154080/ Ratch
  5. R

    Capacitor

    Actually, a capacitor stores energy, not charge. The net charge on a capacitor energized to 100 volts is the same as it is on a capacitor not energized at all. The charge build up on one plate is counter balanced by the removal of the same amount charge on the opposite plate for a net charge...
  6. R

    Capacitor

    Current is measured in amps, not volts. Ratch
  7. R

    Visible light

    There is no radio signal at light frequency. The components that make a radio are incapable of interacting with light and vice versa. A radio and lantern operate on far separate frequency ranges. Ratch
  8. R

    Question about Thévenin's theorem assignment

    You cannot expect this forum to conduct a course in circuit analysis. We can answer specific questions about that subject, but the basic knowledge and background has to be acquired by you. Ratch
  9. R

    Question about Thévenin's theorem assignment

    I get the impression that you do not have any idea of how to perform loop or node analysis to find circuit voltages or currents. You must learn how to do that before you have any chance of solving that problem. Ratch
  10. R

    falstad

    Try https://www.systemvision.com/ Ratch
  11. R

    Validity of equation

    I am using the K-map as an explanation of why the subtraction of a Boolean term from "1" gives the complement of the term. The K-map is as rigorous as a slide rule is for what it does. Ratch
  12. R

    Validity of equation

    It is not a gate, it is an operation, like add or multiply. To complement any Boolean term or expression, just subtract it from "1". Just like you would complement a decimal number by subtracting it from "10". It corresponds to a K-map with the unmarked squares taken as the complement. Ratch
  13. R

    Validity of equation

    DeMorgan's theorem is not necessary. (A'B'+AB)' 1-(A'B'+AB) ; Complement of (A'B'+AB) (A'B'+A'B+AB'+AB) - (A'B'+AB) ; 1 = (A'B'+A'B+AB'+AB) A'B+AB' Ratch
  14. R

    Validity of equation

    Too much time has been spent on this problem already. DeMorgan's theorem is unnecessary. B*A*B B*(A*B) B(A*B)'+B'(A*B) B(AB+A'B')+B'(AB'+A'B) ABB+A'B'B+AB'B'+A'BB' AB +0 +AB' +0 A(B+B') A Ratch
  15. R

    Validity of equation

    Did I not say in post #4 that the asterisk in that problem means XOR? I stand by my statement that the solution is correct, but the method contains an error. Ratch
  16. R

    Validity of equation

    The book is correct here. It is a simple application of DeMorgan's Theorem. Ratch
  17. R

    Validity of equation

    The book solution is correct, but the solution method is in error. They made a mistake at the place you cannot understand. The whole expression should be have a bar over it. They must have made another mistake later to get the correct answer. Two wrongs make it right. Since the "*" means...
  18. R

    Transistors amplification

    A BJT transistor by itself is a transconductance device. So is a FET or a vacuum tube. That means a voltage controls the output current. However, those devices can be incorporated into several types and variations of circuits that can amplify current or voltage. The amplification limits...
  19. R

    Pulse & digital circuit - K-map

    How can you expect anyone to read your attachments when there is a big shadow across part of the pages and the pictures are taken at an angle? I could barely read the answer. The book answer is correct. If your answer does not match, then it is wrong. I used a program I wrote some years ago...
  20. R

    Caller ID stumper

    Unless you can verify that the "test" phones work elsewhere, I would not certify them as fully operational. Especially if they are made in China. Ratch
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