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mettula

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About mettula

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    Advanced Member
  • Birthday 07/30/1987
  1. mettula

    inductor

    wow good software - thanks but please can you tell me the mathematical formula to calculate all inductance etcc.... thanks
  2. mettula

    inductor

    Hello all, me again I wish to know what is the formula to calculate the length and the diameter of an aircore inductor when you have only the inductance value. i.e. for example how to calcultate the diameter and length and turns of an inductor of inductance .15uH thanks very much
  3. and yet another question which i cannot make my mind about. what circuit produces a sine, square, triangular, and saw tooth waveforms opamps or oscillators? i mean oscillators can be build from opamps. what is the best answer to that thanks
  4. am sry is the output going to be +20V. because 5 x (1+[36k/12k]) but as the suply voltage is=/- 18V. will there be clipping ??
  5. if the supply voltage of a non inverting opamp is +/- 18V, the input is 5V sinosodial wave. Ri = 12k, Rf = 36k. what is the output? is the output going to be 15v?
  6. Hello all, I need some help with this question Which of the following statements is not true and why? a. An oscillator must have a source of energy. b. An oscillator must have a frequency determining circuit. c. An oscillator must have an amplifier. d. An oscillator must have a negative feedback circuit. Is it b the one which is not right? thanks a lot
  7. mettula

    pi filter

    Hello - I need a formula for how to calculate the frequency of a third-order low pass filter containing an inductor and 2 capacitors (pi filter) plz
  8. Hello, plwease can anyone tell me how to calculate (mathematical equations) the cutoff frequency of a pi - filter and a T - filter. thanks very much for your help and patience
  9. well I made the expression using Karnaugh mapps and the resultant expression is quite long because of the nature of the posibilities. hope it helps mettula
  10. Hello; I have a quest about transformrs. I wish to know 3 main materials which are used to make the core of a normal (not centre tapped) transformers for 50Hz range to step down 230V into 24V. The transformer is 5VA. Are these 3 materials that can be used ; silicon steel, nickel iron and cobalt iron? or I am in the worng track (as usual :-[ :'( ) Thanks for your help and patience
  11. No you did not get my question again. I am trying to make a half adder with NOR gates. My quest is why when I am arraganging the formula from back to front the result would be different.
  12. no my question was, why when interpreting the circuit in NOR gates, if you make the fomrula the other way round it just woud not work.
  13. hello guys, I have a question on digtal stuff, Why is this happening to me, when I impliment the half adder in NOR Gates if I do it int as int the upper formula in the .jpg, the result is different if i do it as in the bottom formula. Both the 1'st formulas mean the same but the outbuts are different. can someone explain please???
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