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Hello, can somebody help me with an240P

Discussion in 'General Electronics Discussion' started by michael1978, May 24, 2018.

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  1. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    Hello, i make am/fm radio kit superregenerative radio, and trf am, but is to much noise,
    i want to try to make FM superheterodyne receiver, i buy this ic an240p, but to tell you the truth, i dont know good how to use it, whithout your help forum(i can doit) and i know how to use lm386 is easy now for me, but this IC an240P, is more complicated, i did not use, i am not used to use ic, so please can somebody help me how can i make one superheterodyne receiver with this ic an240p step by step please...
     
  2. WHONOES

    WHONOES

    1,133
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    May 20, 2017
    I think you will have trouble building a receiver if you are doing it on a prototyping board. Too many stray fields and capacitance.
     
    davenn likes this.
  3. kellys_eye

    kellys_eye

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    1,147
    Jun 25, 2010
    The AN240P is meant for TV sound - there are better and more suitable ICs for FM reception.

    Your safest way would be to purchase a kit of parts.
     
  4. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    I was in electronica shop, and i ask for fm discriminator, and he say is goed, what to do i buy, when i come back home i dont understand so good datacheet, like i say before i am not used with ic only with lm386, SO i did not know where to start, and that is. what for IC you mean for FM, for example?
     
  5. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    i want to try it, but i dont know where to start it, can you explain me where to start?
     
  6. Audioguru

    Audioguru

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    Sep 24, 2016
    An FM discriminator is only a tiny part of an FM radio. The Japanese one you bought is old and its datasheet says it is sold for maintenance only, not for new products.
     
  7. michael1978

    michael1978

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    Mar 17, 2012
    AudioGuru i ask for help, there are so much specialist in electronica, i dont understand why they dont help...............
     
  8. duke37

    duke37

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    Jan 9, 2011
    AudioGuru disparaged your AM receiver kit and suggested a superhet. Perhaps he could help you use this IC?
    Age is not too be used as a reason for incompetance, I know personally.:)

    I see no way of inputting tuning, it seems to be fixed tuning for TVs IFs as suggested.
     
  9. michael1978

    michael1978

    388
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    Mar 17, 2012
    Rely pfffffff this not normal i have to go back in electronica shop to replase with something else, i dont know what for ic is easy to use for fm, do you have any idea wich ic is easy to make fm and to understand easy.
    thnx Man
     
  10. kellys_eye

    kellys_eye

    4,275
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    Jun 25, 2010
    To 'walk' someone through the construction of an FM superhet receiver is well beyond the scope of this forum and any individual's time - unless, of course, they are supremely selfless....

    If this is your first radio construction project then it is 'too advanced' and I suggest you look at smaller and simpler radio's such as direct conversion or TRF versions to get the experience required. No point in jumping in at the deep end!

    You can Google for any 'type' of radio receiver chip and get the datasheets for them - many datasheets include application notes that describe the basic requirements to make the device work but unless you have ready access to the likes of IF transformers and ready-made coils, tuning capacitors etc then you might find getting the parts as difficult as building the radio.....

    Here's a kit of parts that costs under $10

    https://www.ebay.co.uk/itm/Superhet...733588&hash=item3d54591d1a:g:VQ4AAOSwCtJaRM-v
     
    Last edited: May 25, 2018
  11. Audioguru

    Audioguru

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    Sep 24, 2016
    Years ago, Philips invented the TDA7000 FM radio IC and many of its circuits and pcb are shown in Google Images. It was a superhet but oddly used low frequency opamps for its IF amplifier. It was tuned with a variable capacitor, variable inductor or a variable voltage. Its performance was poor.

    They replaced it with the TDA7088 that scanned frequencies. There are Chinese copies of the TDA7088 in radios sold at The Dollar Store that cost one dollar. The radio comes with a battery and earphones that are worth one dollar so the actual radio is free. Its performance is also poor.

    Most people learn about radios in University. The salesman in your electronica shop did not.
    You might or might not find an electronics teacher on a forum.
     

    Attached Files:

  12. hevans1944

    hevans1944 Hop - AC8NS

    4,616
    2,156
    Jun 21, 2012
    Get a working FM radio and a set of schematic diagrams for that radio. Get an oscilloscope with at least 50 MHz bandwidth. Get an RF signal generator with FM capability. Get and read several different text books, by different authors, on how radios work. Put all this together on a well-lighted work bench in a quiet place where you can work undisturbed. Practice every day probing around inside the radio with the oscilloscope probes while using the RF signal generator as a signal source... much more reliable than "over the air" radio transmissions. Try to understand what you see and relate it to the descriptions in the text books. It helps if you start this process well before age thirteen because distractions will occur after that.

    BTW, the LM386 is to superheterodyne FM radios as a commercial airliner is to a jet fighter. Both the airliner and the jet fighter fly, but their missions and methods are vastly different. You need to learn a lot more electronics before even thinking about using an LM386 with a "home-built" FM radio.
     
  13. michael1978

    michael1978

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    Mar 17, 2012
    I dont know, i build one am/fm radio kit, but he dont explain nothing, only how to mount, thnx man is that in english also the kit?
     
  14. michael1978

    michael1978

    388
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    Mar 17, 2012
    Why not here is also to help each other
     
  15. michael1978

    michael1978

    388
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    Mar 17, 2012
    I start older than 13 year, because of possibility
     
  16. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    do you see here most of time CAN YOU HELP lME, i dont ask only me ......
     
  17. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,496
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    Jan 21, 2010
    I suggest you blame @Audioguru

    In a previous thread he suggested that you build something extremely complex as an answer to your question regarding an explanation of how a relatively simple kit radio worked. If your aim is to learn how radio receivers work then you have been badly lead astray by him.

    Can you tell me what your primary objective is?
     
  18. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    To tell you, just i want to make a fm from skilet, and there are thing that i dont understand, not all, No No i dont blame nobody, NOBODY is mandatory to help you.
     
  19. Audioguru

    Audioguru

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    Sep 24, 2016
    I helped you by posting a link to an AM-FM superhet radio kit that comes with a university course about how it works. Now in this thread you are asking for help with an old Japanese part of a TV sound system.
     
  20. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,496
    2,837
    Jan 21, 2010
    You want to make an FM radio from a frying pan?

    Can you explain more clearly? I understand that English may not be your preferred language, but we really need to come to a common understanding.
     
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