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Andbor

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Posts posted by Andbor

  2. AM to FM convertor

    in Projects Q/A

    Posted

    Hi Audioguru

    Finally some good news ;D ...

    The circuit actually worked! We tried seeing it's output with an osciloscope and an FM like wave was there. It was a little difficult tuning it, but finally it worked. However, as you said, too many stations are in 1 fm station and sometimes if you wave yourhand on top of the circuit, the station changes!  I think that the circuit name would better be suited to " All waves to Fm convertor" , cause it picks both AM and FM.
                                         
    I would like to thank you very much for your help because it was very usefull!
                                                    Thanks very much
                                                        andbor

    P.S: It even picked up a tv station!

  4. AM to FM convertor

    in Projects Q/A

    Posted

    Hi audioguru
    now I tried testing it and I doubled the turns on L1 and L2. ( L1 was ,3 now it is 6, and L2 was 7, now it is 14) Still nothing happened but a strange thing happened: whenever i power up my cirucit, on the fm radio a sort of hissing/crackling noise sound is heard. What can it be? Also, below I am including a copy of what the author had replyed to me when I first asked him if it woked on a breadboard. I tried asking him  about how the circuit seperates Am stations, but he didn't reply any more.

    Thanks

    _____________________________________________________________

    hai

  5. AM to FM convertor

    in Projects Q/A

    Posted

    HI audioguru
    well to be honest today I tried to operate it and nothing happened. I tuned the radio into noise and tried to hear if there was an am like station broadcasting, but there was nothing. Also, I tried to replace the parts with those you suggested, but still nothing happened. I am now going to double the number of turns of the inductors
    Thanks

  6. AM to FM convertor

    in Projects Q/A

    Posted

    Hi audioguru
    as you have helped me a lot in this project ( i thank you a lot for this) I immediatly decided to follow your suggestment. Can you tell me where can I find a simple am circuit and a simple fm transmitter circuit and how can I get them working together. 1 thing though, the MK484 is hard to find here in Malta, and you have to order it from abroad, that passes the limit of time to complete the project. Is there an Am receiver without an mk484?
                                                  Regards
                                                Andbor

  8. AM to FM convertor

    in Projects Q/A

    Posted

    Hi audioguru

    finally i managed to get the 1mm enameled wire as shops didn't have it and I finally got it from a transformer manufacturer(as you said).I am using the 1mm instead of the 24swg. Can you give me an idea if it will work? Now I am ready to build it on a pcb but when I showed it to my friends they said that there was something  weird about only having 1 aerial. As you helped me a lot in this project, what is your point of view about this?

    Question2 : I aready asked you about if it works on a breadboard, and you said that vhf doesn't work on breadboard. Sure enough, when i tried it on a breadboard nothing happened, and my teacher gave me the same answer. However, when I contacted the author of this circuit, he said that it worked on a breadboard, and another technician said that it wil work on a breadboard. ??? ???I am really confused. Anyways, i now have got the pcb ready and will try to solder it tomorrow.

                                      10x a lot

  10. AM to FM convertor

    in Projects Q/A

    Posted

    Ok thanks, just one more quesiton (sorry to bother you). Before I got your reply I built it on a breadboard, and obviously nothing happened in the fm band.however, when i set the radio mode to am, whenever I switch the circuit mode I hear like a small "
    put" on the radio, like someone is tapping a microphone. Do you know what can it be?

    And a last question. i am building this as a project to achieve my national diploma in telecomms, so you can understand it's importance. Some people have doubted if it will work. Can you tell me if it will work or not?
    Thanks a lot for your patience ::)
    Andbor

  13. AM to FM convertor

    in Projects Q/A

    Posted

    HI audio guru
    I tried as you told me but still nothing happened. As the description says, it is supposed that when you switch it on, you will hear am stations on the fm band, right? Do you have any suggestion of what i can do? to make the inductors I tookk a 5mm diameter philips screwdriver and wraped the 24 swg for 3 turns and 7 turns

    Thanks
    Andbor

  15. AM to FM convertor

    in Projects Q/A

    Posted

    Hi all

    i'm trying to build an AM to fm convertor. First of all, has anyone tried it and if he did, did it work? second, if you take a look at the circuit diagram, you have 2 inductors, L1 of 3 turns and L2. Can anyone tellme what is their value?
    Thanks
    Andbor

    post-7429-14279142141149_thumb.gif

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