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  1. walid1

    Crystal examiner

    Hi AN920 Thank you for the wonderful and important answer. Questions: (a) The feedback ratio is the loop-gain = 150/680 = 0.2 < 1, are u mean that? (b) The remot control's crystal is 455KHz, can u please tell me the appropriate values for those caps, What the role? © How can influence? (d)...
  2. walid1

    Questions in Radio receivers?????

    Thank you AN920, It is very clear Questions: (a) After considering all of the above:     Can we consider that C1 play a impedance matching between the antenna and the tuned circuit? (b) Another point is still unclear to me is : if we consider that the length of one meter of the wire antenna...
  3. walid1

    Questions in Radio receivers?????

    Hi AN920 I have read with interest all that came in your last reply, so I read it more than five times, I want to further shed light on the following points : (1)    Are u mean the series impedance of the antenna? And if so, What can the antenna be considered from this point? (2)    Are u...
  4. walid1

    Questions in Radio receivers?????

    I am sorry if continued reading found the answer which is: But if you have any useful addition, welcome
  5. walid1

    Questions in Radio receivers?????

    Hi all These days I read a book on radio receivers from the site : http://www.mikroe.com/en/books/rrbook/rrbook.htm During the reading, sometimes I find it difficult to understand some of the points, so I ask you to help me understand. Thank you very much. Question #001 (from sec: 3.1.4...
  6. walid1

    need a program to simulate in electronics

    Dear AN920, I do not find the right words to express to you my deepest thanks and respect. thank you very much. questions: (1)The transformer Comprising L1, L2 and L3 have DOT at the bottom of each coil.   I remember I studied something of this kind before, but now I forgot its purpose, can u...
  7. walid1

    need a program to simulate in electronics

    Hi AN920 You are good person , I benefited greatly from your help, thank you from the bottom of my heart . What if I want to make a center tapped transformer at one side, how to simulate it.
  8. walid1

    AM reciever mixer

    Thank you very very much, I have SWcad III, Guru give it to me it is a good news that SWcad can do it i'll try it with different values to see somethings then back to you to discuss thank u again AN920
  9. walid1

    Free download sites for Stereo Radio Cassette Recorder Schamatic diagrams.

    MAY BE THIS SITE HELP: http://www.eserviceinfo.com/index.php?what=login
  10. walid1

    need a program to simulate in electronics

    hi guru not at all, for example there is no variable cap and no transformer ..... how to get these parts? To Master_Ianick , thank you very much To Steve_hi , thank you very much
  11. walid1

    AM reciever mixer

    Hi AN920 i put "Multisim National Instruments" in google but did not know how to download it please give me the link thank you AN920
  12. walid1

    Oscillator question

    Thank you guru
  13. walid1

    Oscillator question

    I am not expert like Mr. guru, I will try to answer using my simple information : Oscillators can be built using opamps or transistors or may be some special IC's. opamps can not handle high frequency but transistors can if u want to build a function generator try to search one in google or...
  14. walid1

    AM reciever mixer

    Hello AN920, in fact, I thank you from the bottom of my heart to respond quickly. It is clear you made an effort to explain the idea but unfortunately I did not understand much, lets see: In your circuit, L = 4.7+4.7 = 9.4 uH C = 560p So the resonance freq fo is about 2.2 MHz. At fo i see from...
  15. walid1

    need a program to simulate in electronics

    Hi please I want the program to simulate in electronics to perform some tests on the transmitter and receiver thanks
  16. walid1

    Oscillator question

    Hi The statements which is not true is: d. An oscillator must have a negative feedback circuit. because  An oscillator must have a positive feedback circuit to maintain oscillation. negative feedback is good for amplifiers to get more stability.
  17. walid1

    AM reciever mixer

    Hi AN920, First, thank you for clarification and assistance, there are still some questions: Before that we have to agree on some things following: this is an AM radio reciever antenna, local osc and mixer AM band is from 530 KHz up to 1600 KHz the local osc' freq is always above that value of...
  18. walid1

    AM reciever mixer

    Thank you AN920, I saw this link previously, commentary good, but not enough. The most important thing in that link : my question: in my drawing: Can I consider the 10n cap connected to the emitter as a bypass cap and thus get a high voltage gain:    I know that one purpose of using that cap...
  19. walid1

    Gang specifications used in FM receiver.

    Hi shamim in addition to what guru said, look at the following link: http://www.mikroe.com/en/books/rrbook/chapter3/chapter3b.htm hope it help u
  20. walid1

    AM reciever mixer

    Hi guru the input signal is already AM signal. How AM signal amplitude-modulates the oscillator signal? thank you guru
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