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    I've made two different circuits to receive RF using LM386 but they don't work


    Hi,can anybody help me?

    I've made two different circuits to receive RF using LM386 but they don't work. I've changed the values of C2 and L1 to change the frequency. I've also changed the gain but nothing happens.

    The problem is that I hear a sound of noise or buzz from the speaker. When I touch Pin 3 (The input) or the Antenna, The sound become higher but anyway no radio station is received.

    I've made a radio transmitter using a transistor before so, I turned it on. The receiver circuit received the song which is the input of the transmitter. It receives no matter the values of the C2 and L1 of the Tank circuit so, I removed the tank circuit and connected the antenna directly to pin 3 and It also works receiving the song.

    Why it doesn't receive any radio station although it receive the signals that are transmitted by the transmitter circuit that I've made ?

    What can I do to receive radio stations ? ( I live in area where I can receive good radio stations AM and FM from my cell phone and Radio device )
    here is the details of the IC :http://www.kynix.com/Detail/274538/LM386.html

    [img]https://i.stack.imgur.com/sI7Mb.png[/img]

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    This post is a "cut-and-paste" of a question that was asked and comprehensively answered in an electronics forum 2 years ago. The only significant change is the link to the commercial site k***xdotcom.

    So creeake, if you are not one of the new generation of AI bots used to pepper the web with search rating enhancing links could you reply to this telling us a bit more about yourself and your project. I would hate to mark you as spam if you are genuine.

    Regards
    Wibby

    Heaven in the sky is to die for, Heaven on earth is to live for.
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    Update:

    Other forums are taking steps to control posts with links to k***x.com

    For example-
    https://forum.mysensors.org/topic/6090/is-there-an-easier-way-to-compare-the-voltages-of-these-two-sensors

    Scroll down and read replys.

    Also, a useful site to cross check for spamming links. Just search on link domain e.g. "k***x or posters username, although these are usually changed from spam to spam.
    https://www.stopforumspam.com/search

    Freesound has had hundreds of new users recently who post once or twice with irrelevant commercial links but have never uploaded or downloaded or contributed in any relevant fashion to our conversations.

    This new type of AI spam may not be as immediately annoying, but it does severely dilute our great forums and is going to grow exponentialy in the near future as it gets even more sophisticated. I can see a point in a few years time when only 1-2% of posts are worth reading and everybody gives up. Right now I really enjoy following many of the threads when I log on daily. Every now and then I join in if I think I have something useful to say. I would be very sad if that changed. I love freesound and all the interesting people I've met - but will never meet in person.

    Rant over - but I do think this is serious,
    Wibby

    Heaven in the sky is to die for, Heaven on earth is to live for.
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    Arrrgghhh!
    I read the message AND clicked the link!
    Promse I did not by anything grin
    I'm not ready for the era of AI bots.

    On other sites you have to introduce your self in
    a special thread before you can post somewhere else.

    Maybe not bot safe but...

    #botwar

    New to this! It' true...
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    Hi gis_sweden

    Thanks for noticing. Clicking the link doesn't actually do much harm other than waste our time. They don't expect to get any trade from these forums. The link is there purely to be counted by googlebot and the other search engines. If they get enough links out on the web the site rises up the rankings and might end up on page 1 or 2 on google search instead of languishing on page 378462. That's where their business comes from. Companys spend millions with these marketing firms to improve their search rankings and they do this by automated spamming. Not a hugely intrusive problem at the moment, just an irritation, but it will be a problem if the ratio of spam to real content gets to 50-50 say, or even higher. It's a race to the bottom; As a Companys competitors use these tricks to up exposure the pressure is on them to do even more of it themselves and it soon becomes a chain reaction.

    Regards Wibby

    Heaven in the sky is to die for, Heaven on earth is to live for.

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