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  1. 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
  2. mettula

    another question, regarding non inverting op amp

    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?
  3. mettula

    Oscillator question

    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...
  4. mettula

    pi filter

    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
  5. mettula

    transformers

    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...
  6. mettula

    digital question

    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...
  7. mettula

    pulse waveform

    hello - i have a question to ask; A pulse waveform has a mark:space ratio of 1:4. The pulse duration is 0.5ms and the peak amplitude of the waveform is +10V Calculate - a) the pulse repetition frequency and b) the average voltage of the waveform. ----------------------------- Is the pulse...
  8. mettula

    Unbalanced to blanced

    Hi all, sry for asking again, but can anyone tell me how can I convert an unbalanced signal to balanced signal. Do I need a BALUN transformer? or just a centre tapped transformer?? can anyone also suggest a brand of such items??? Thanks very much matthew
  9. mettula

    opamps

    Hello everybody I have a difficulty. On the attahced .jpg file one can see 2 symbols of an opamp. But one opamp has 2+ instead of 1+ and 1-. Does this means that the oparational amplifier is used as not as an non inverting amplifier.?? Also how can I make it without any gain?? Also when I have...
  10. mettula

    digital

    can anyone recommend a book which has some digital boolean algebra or karnaugh maps and worked examples of these thanks
  11. mettula

    synthesiser

    hi guys I am in need of the circuit diagram of NX2000 technics synthesiser. I need it because I have tha mentioned synth but it is not working ( no sound comes out - but the amps work :'() Anyone with an idea of what can I do?? Thanks for the great help as usual :)
  12. mettula

    Transistor BF 494

    i wish to ask again  :-[ :-[ :-[ i am not good in electronics  :-[ :-[ :-[ can i for the schematic  of veronica 1w pll pro use 2N2219 or 2N3553 or something equvalent instead of the BF494??? my local shop has nt  BF494 or BF 184 thanks a lot :-[ :-[ :-[ and can anyone suggest a page for...
  13. mettula

    caps

    i wish to ask, exactly how do you verify if a capacitor is good or opend/clesed by means of digital multimeter thanks!!!! >:(
  14. mettula

    rf power amp

    hello all out there, i need a schematic to try and boost an rf power of 1 w to 3 or 4 watts for personal training on rf. Pleaser i need a circuit and/or schematics.!!n 10ks guys :)
  15. mettula

    7v5

    anyone can plz suggest an alternative for the diode 7v5 - my local shop hasnt :-\
  16. mettula

    74LS193 and CD74HCT193E

    i wish to ask what is the difference between 74LS193 and CD74HCT193E - do i get the same result if one is not available in my local shoop. I think they are the same but different name due to diferent manufactur. Am i wrong ???PLZ advice ... 10ks
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