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Recent content by ahmedsalah00

  1. A

    whats the difference in application of ferrite core transformer

    As I understand you want to buy a ready-made transformer rather than winding it manually. would you supply more data about its part number ? The first thing that comes to mind is that the fifth leg is a center-tap !
  2. A

    Signal conditioning Question

    Hi everybody I need to find an instrumentation amplifier to drive an ADC . the amplifier input is the triangular voltage signal from 1 KHz to 1 MHz shown in the figure. I need to keep this signal without distoration while multiplying by a gain of 3 . Any suggestions ?
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    Large Signal Frequency Response

    Thanks so much for your feedback. It is much appreciated. :-)
  4. A

    Large Signal Frequency Response

    so , we may think of figure 20 as the SOA (safe operating area ) of work ?
  5. A

    Large Signal Frequency Response

    Hi I just need to understand the curve entiteled "Large Signal Frequency Response' in the AD620 Instrumentation amplifier datasheet. my concrete questions are: 1- What are the dashed verticle lines ? G=100 and G=1000 2- What does the phrase "BW limit" indicate in the curve? and why ? please...
  6. A

    Core losses for DC biased ferrites

    Hello all, I am trying to calculate the ferrite core losses resulting from the an alternating current biased by a certain DC value. the core is ETD29 and the material is Epcos N27. What is the value of flux density B that can be used in the Manufacturer Pv curves? Bmav , Bav or ∆B ? the...
  7. A

    Core losses for DC biased ferrites

    Hello all, I am trying to calculate the ferrite core losses resulting from the an alternating current biased by a certain DC value. the core is ETD29 and the material is Epcos N27. What is the value of flux density B that can be used in the Manufacturer Pv curves? Bmav , Bav or ∆B ? the...
  8. A

    controlling speed ac motor with 8051

    I think V/F ratio must be kept constant for frequencies over the nominal frequency. But for lower speeds (lower frequencies) , V can be kept constant while changing the speed by changing the frequency. Ahmed Salah
  9. A

    controlling speed ac motor with 8051

    Hello which kind of AC motor is it ? if it is an induction motor , you can not control its speed by controlling the voltage as its output torque will decrease dramastically. However , you can control its speed by changing the frequency you should read something about space vector pulse width...
  10. A

    Why I see 10A current pulse?

    Re: Current pulse What about IRF740 ? VDSS 400V Rds(on) 0.55Ohm max ID 10A trr Reverse Recovery Time ––– 360 ns, IF = 10A Qrr Reverse RecoveryCharge ––– 2.9 µC di/dt = 100A/µs you can use the selection guide of international rectifier to choose the best transistor according to your load...
  11. A

    How to interface an AV camera to a microcontroller?

    camera interfacing yes the idea is implemented in so many applications. For example Olympus C-750 can be interfaced and contrlled by its USB connection. there are numerous camera's and CCD's in the market. Good luck in your search
  12. A

    Simultating Microcontrollers

    This topic is discussed before, Have a look at this: and and
  13. A

    which PCB designer program to use?

    I used protel 1.0 , protel 1.5 , protel 99 , protel DXP and PCAD. I think Protel DXP is a very powerful tool for PCB and circuit design . it has a compatible spice engine for circuit simlation. I didnt like PCAD because it lacks libraries , you have to define the foot print for each component...
  14. A

    CRC - error detection/correction

    Hello , I know that CRC (in which a polynomial is used) is a tool for error detection. but it is not used for correction. I dont have a big experience so my answer may be wrong.
  15. A

    selecting a pull up/down resistor value

    for which application ? would you draw a circuit if possible ? In general , you have to select the value of the resistor so that the current doesnt excced a certain value.

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