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  1. walid1

    How does this simple circuit operate?

    Hi this is the circuit thanks
  2. walid1

    reshaping a signal

    Hi I need a circuit that  when the upper signal is in, get the out signal at the output thank you   if the phoito is not appear. the input sirnal is a dc positive pulses and the needed output is dc contenuous
  3. walid1

    questions about FM Superhetrodyne Receiver

    Hello Q1) If the received signal frequency = 100 MHz, then the local oscillator equal 110.7 or 89.3 MHz? thanks
  4. walid1

    question about Low Pass Filter

    If the cutoff frequency of both filters is  not the same? is it sitll -6dB thanks
  5. walid1

    Transistor collector current

    Are you mean like emitter follower? What about a voltage divider configuration preamp. is there a situation here that we want a high IC current? I stay, think long time about it, choosing small current (IC) give us a high Zin a long batt life and a transistor works in light duty, why not choose...
  6. walid1

    Transistor collector current

    Hello everyone We all know that Input Impedance decreased when we choose a high collector current, and that is ok I want to ask: When one choose high current? thank you
  7. walid1

    question about Low Pass Filter

    Hi for the LPF shown below, the cuoff frequency is at -3dB or -6dB and why? thanks
  8. walid1

    electronics

    Hi If you read the discussion in the following link will return you the great benefit http://www.electronics-lab.com/forum/index.php?topic=4705.0
  9. walid1

    Electrolytic Capacitor

    Thank you guru I really miss you
  10. walid1

    Electrolytic Capacitor

    Hi Why an Electrolytic Capacitor explode when connected in reverse mannar? thank you
  11. walid1

    about RX-3 IC

    Hello frome the datasheet of RX-3 i get the following application circuit and at the left side there is antenna and related component: My question is what the purpose of the transistor Q1? thank you
  12. walid1

    bad results in multisim 10

    hi I use a multisim-10 to simulate a VCO which intended for 106MHz freq output but the o/p is only 50 KHz as seen in the attached pic why?? thank you in advance
  13. walid1

    What the value of Zout???

    I appeal to my friend  audioguru to respond to the subject I waited for his reply for more than a week Thanks
  14. walid1

    What the value of Zout???

    I discover the answer of the second question: the RMS value of the peak voltage = Vpeak/squre root of 2 and when we squre that root we get 2 which appear in the equation. i need answer to question 3 thank you very much
  15. walid1

    What the value of Zout???

    Hello guys In the following link, http://www.electronics-tutorials.com/amplifiers/negative-feedback.htm the author speaks about how to made the necessary calculations to determine the transformer's turns ratio and also the LC needed for impedance matching a 50-ohm antenna to the preceding...
  16. walid1

    What the value of Zout???

    Hi Guru Thank you for attention What do you think of this circuit from: http://www.talkingelectronics.com/projects/27MHz%20Transmitters/27MHzLinks-1.html The author use a transformer then PI network filter for impedance matching the low Z antenna (50 ohm) to the very high (near infinity) Z tank...
  17. walid1

    What the value of Zout???

    what to do if the load is 1k only?? Do I have to replace the coil with a stepdown RF transfrmer??
  18. walid1

    What the value of Zout???

    What the solution then?? Do I have to replace the coil with a stepdown RF transfrmer?? What is the turn ratio then if i want to match with 100K ohm load? thank you in advance.
  19. walid1

    What the value of Zout???

    thank you guru Be sure that the resonance freq is 27MHz is the Zout = XC//XL; the parallel equivalent of the two reactancess (coil and ca)??? regards
  20. walid1

    What the value of Zout???

    Hello guys The attached photo is a crystal oscillator it is a voltage divider config. but replacing the RC with LC tuning tank I need to know the out put impedance Zout?? Is it XC// XL at the operation freq 27MHz??? please help me thank you in advance http://NOTE: sorry L= 3.48 uH not 1.2 uH as...
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