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  1. walid1

    a regular transformer

    What i mean is that the ferrite core transformers like a flyback or the one used in a switched mode power supply has an air gap to stor energy.
  2. walid1

    a regular transformer

    what about air gap in which they store energy
  3. walid1

    a regular transformer

    Hi I read this somewhere: "a regular transformer is designed to transfer energy from its primary to secondary and to minimize stored energy." Can someone please explain how they minimize the stored energy, that is what they do to minimize it? thanx
  4. walid1

    filter

    I want to learn
  5. walid1

    Question about Ground Loops

    hi all u all must know that i am the only person among tens in my work who has the chance of conncting with u and the natural result of this must make me the more understanding person and this is not occur till now ok i am in advance but slowly..... now i have a FLUKE 112 TRUE RMS MULTIMETER...
  6. walid1

    Resistance wattage in series

    hi audioguru the answers of part 2 and 3 are ok the answer of part 1 is not satified me, i don't think it for dischage the 10u cap what if i remove it from the circuit what would u expect?
  7. walid1

    Resistance wattage in series

    Hi The circuit shown below is the power supply section of a stairs light timer. I draw it from a real timer circuit. I have some questions. (1) The 18K-1/8w resistor. It waste (9V/18K=) 0.5mA current to ground all the time. What the purpose of this resistor? I check its connection many time and...
  8. walid1

    Resistance wattage in series

    Oh what would i do now this i different saying now i need a third person to put me in the correct road, hope to be audioguru.
  9. walid1

    Resistance wattage in series

    Are u sure Ante, or, can I say that three 1K ohm 1/2 watt resistors in series are equivalent to one resistor of 3k ohm 1/2 watt if yes please tell me to be sure thanks
  10. walid1

    Resistance wattage in series

    Hi I analyze a timer circuit using transformerless power supply, that is no transformer, but a 330 nF in series with two 240 ohm 1/2 watt resistors. i noticed that the designer always use two-series 240 ohm 1/2 watt resistors. he do so three times in different places in the circuit. Also he...
  11. walid1

    Bigginers Handbook

    Me too [email protected] thanks
  12. walid1

    Question about Ground Loops

    I prepare a report in my work about the correct grounding and I asked the above question yesterday and wait more than 24 hours please anyone answer this i have not time. thanks
  13. walid1

    Transformers

    Hi u can use this valuable link: http://www.electronics-tutorials.com/basics/transformers.htm I hope it be ok
  14. walid1

    LC circuit

    this depends on the values of L and C. the primary coil of the stepdown transformer is connected to 230V AC Cap rating 230v or more can be connected across 230v tell us what u want to do to be able to understand
  15. walid1

    Question about Ground Loops

    I read The following from: http://www.leminstruments.com/grounding_tutorial/html/soilresistivitytest.shtml Measuring Soil Resistivity 4 - Pole Method The calculation of this measurement can be simplified by converting distance in cm to distance in feet giving you the following equation:      ...
  16. walid1

    LM324, LM358 crossover distortion

    Hi audioguru thank u very much for this note but please what is the crossover distortion define it for me thanks
  17. walid1

    need help on tuned amplifiers

    using google "tuned amplifiers circuit" I found the following valuable link among hundeds http://www.electronics-tutorials.com/amplifiers/tuned-circuits.htm I hope it help you WALID
  18. walid1

    Question about Ground Loops

    Hi audioguru MP tell me this: "Set your multimeter to ohms and check the resistance between the ground of the two connected devices. For example, the resistance between the metal chassis of the two devices. If there is resistance, you have a ground loop problem. If you get a reading of zero...
  19. walid1

    Question about Ground Loops

    I read the following on: http://leminstruments.com/grounding_tutorial/html/soilresistivitytest.shtml "The depth that the test electrodes is to be driven is A/20" then the writer said: "The ground stakes should be screwed in no deeper than 1/3 the distance from one another" please refer to the...
  20. walid1

    Question about Ground Loops

    any set (like TV) have a plug to connect it to electrical power each pluge has 3 terminals, phase neutral and ground (earth). Now, my question is: Is the metal chassis connected directly to the Ground (Earth) or not? And if i want to measure the resistance between the metal chassis of the two...
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