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Hello, can somebody help wich transistor is like bfg520

Discussion in 'Radio and Wireless' started by michael1978, Jul 27, 2018.

  1. Audioguru

    Audioguru

    2,345
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    Sep 24, 2016
    I do not have time to talk about this simple circuit in 220 posts.
    FIRST you need to learn English.
    SECOND you need to learn electronics basics.
    THIRD you need to learn about radio circuits.
    FORTH you need to learn about the simulation program.
     
    davenn likes this.
  2. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    Please dont be nervous, we are already finish, when we fnish i gonna learn simulation, and basic i know, take one book of basic of electronics, you learn about resistor capacit, inductos in serie parallel, basic of npn en jfet,diode, some sorten of semiconducturs, that is my dear
    but i am learning about radio,
     
  3. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    HI Audioguru, i finish, is the demulated signal
    look 2.png 22.png
     
  4. Audioguru

    Audioguru

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    Sep 24, 2016
    Where did you measure the two different signals? C8 produces only one signal.

    Good, you have an audio output at 1kHz. But its level is very low and it is very distorted, the same as when my FM clock radio is not tuned to the center of the radio frequency. Try increasing then decreasing the tuning capacitor values or the tuning inductor values one at a time. When the signal level increases then you are getting the tuning closer to what it should be.
     
  5. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    THE RESULT IS FROM C8N AND SFFM LAST ONE? You mean tuning from tuning capacotor at resonant 10.7Mhz, no problem thanks VERY VERY MUCH AND SORRY FOR BORING YOU(realy);)
     
  6. Audioguru

    Audioguru

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    516
    Sep 24, 2016
    You should label the images of the oscilloscope about where they came from. Was the fist image from C8?
    Where did the lower level second image come from?

    Of course the LC resonant circuits must be tuned to your input frequency of 10.7MHz. I did not calculate the resonant frequency because I do not know how much stray capacitance there is.

    The tuning capacitors are C1 and C3.
     
  7. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    THANK YOU VERY MUCH, i dont know how to thank you;), you are specialist
     
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