electronics

  1. A

    Good at electronics, not so good at the maths!

    Hi everyone, I am a retired electronic test engineer who still does electronic and software stuff for fun. I can do the electronics but from time to time I run into some maths that defeat me. Often, the www can supply answers but when it doesn't I am stumped. I have just encountered such a...
  2. D

    lapsed electronics engineer needing help

    (Clapping) hi all i graduated 25 years ago with an honours degree in electronic engineering but have not put into practise what i learned - of great disappointment. Mainly because there was a distinct lack of jobs where i live for electronics. Why did u do it, i hear you ask - ...mm - not sure...
  3. N

    Electronics - Calculating charge

    Hi everyone! :) So here is my question: The currents of the terminals in the terminals of the element in Fig. 1.5 (I attached a picture) is: i = o, t < 0 i = 20 e -5000 t ≥ 0 Calculate the total charge (in microcoulombs) entering the elemnet at its upper terminal. I am a bit confused...
  4. C

    Matrix Algebra.

    Hey everyone, Could someone please shine some light on this question, I'm not sure I fully understand how it's worded? Chris. A range of metallic alloys are tested for electrical conductivity and give the following results for identically sized samples. 25% copper with 75% tin...
  5. H

    Electronics function help.

    Hello, Been out of practice so long that all is forgotten.(Headbang) I was wondering if someone could help me understand and apply the following expression: V = \frac{{1/V_{tn}}}2+\int_{t0}^{t=n-1} \frac{V_{1}...V_{n}/n}2 It was suggested to me to help smooth out a noisy voltage signal...
  6. B

    electronics formulas?

    Hi, could anyone explain the formula used (eg V,I,R,) for the following questions, you don't have to answere them just explain the working...thanks. a) What is the reluctance of magnetic material 0.8m length, 0.6m^2 CSA, if the absolute permeability is (wierd u shape) U = 300 x 10^-7 web/at...