---
+ Post New Thread
Page 1 of 2 12 LastLast
Results 1 to 20 of 21
  1. #1
    Newbie level 3
    Points: 565, Level: 5

    Join Date
    Dec 2009
    Location
    pakistan
    Posts
    4
    Helped
    0 / 0
    Points
    565
    Level
    5

    FM RECEIVER

    A.O.A my new project in communication systems is "fm receiver" . I need a simple circuit diagram for this . thanks

    •   Alt6th December 2009, 09:33

      advertising

        
       

  2. #2
    Advanced Member level 5
    Points: 29,459, Level: 41
    Achievements:
    7 years registered
    Audioguru's Avatar
    Join Date
    Jan 2008
    Location
    Toronto area of Canada
    Posts
    4,814
    Helped
    1033 / 1033
    Points
    29,459
    Level
    41

    FM RECEIVER - simple diagram needed

    You can buy a very simple FM receiver at The Dollar Store for only $1.00. Because it is so cheap then its performance is horrible.

    You can make your own FM radio if you can buy the special parts somewhere and borrow the expensive test equipment to align it.

    An FM radio that performs well is very complicated, not simple.



  3. #3
    Newbie level 3
    Points: 556, Level: 5

    Join Date
    Dec 2009
    Location
    SG
    Posts
    4
    Helped
    1 / 1
    Points
    556
    Level
    5

    Re: FM RECEIVER - simple diagram needed

    u can try to search for the diagram by using this engineering projects search engine.

    www.mylab.tk



  4. #4
    FvM
    FvM is offline
    Super Moderator
    Points: 173,635, Level: 98
    Awards:
    1st Helpful Member

    Join Date
    Jan 2008
    Location
    Bochum, Germany
    Posts
    28,279
    Helped
    8887 / 8887
    Points
    173,635
    Level
    98

    Re: FM RECEIVER - simple diagram needed

    Your intention isn't clear. Are you looking for a low complexity receiver design? In this case, analyzing the said dollar store
    products or possibly a cheap radio from your home would help. Or do you mean a low part count, but rather complex function
    single chip receiver?

    In my opinion, two building blocks are mandatory for a FM receiver, a frequency selective frontend (most likely involving
    some gain) and a FM demodulator. Everything else is optional.



  5. #5
    Advanced Member level 5
    Points: 29,459, Level: 41
    Achievements:
    7 years registered
    Audioguru's Avatar
    Join Date
    Jan 2008
    Location
    Toronto area of Canada
    Posts
    4,814
    Helped
    1033 / 1033
    Points
    29,459
    Level
    41

    FM RECEIVER - simple diagram needed

    I hate to mention a poorly performing single transistor super-regenerative receiver. There are a few of them on the internet. It is really an AM radio but receives FM by "slope-detection" when it is tuned to one side of an FM radio station. They are overloaded by strong local stations easily.



  6. #6
    Banned
    Points: 7,016, Level: 19

    Join Date
    Apr 2009
    Location
    New Jersey, USA
    Posts
    671
    Helped
    170 / 170
    Points
    7,016
    Level
    19

    Re: FM RECEIVER - simple diagram needed

    There are several companies that make single-chip FM receivers that can be controlled with a serial input. SiLabs is one http://www.silabs.com/products/audio...s/default.aspx



  7. #7
    Advanced Member level 5
    Points: 29,459, Level: 41
    Achievements:
    7 years registered
    Audioguru's Avatar
    Join Date
    Jan 2008
    Location
    Toronto area of Canada
    Posts
    4,814
    Helped
    1033 / 1033
    Points
    29,459
    Level
    41

    FM RECEIVER - simple diagram needed

    The tiny SiLabs chips are used in cell phones and are not very good. They are a little better than the garbage Philips chips that the Chinese copy and are sold as a radio for $1.00.



  8. #8
    Junior Member level 1
    Points: 956, Level: 7
    sabu745's Avatar
    Join Date
    Dec 2009
    Location
    KERALA,INDIA
    Posts
    19
    Helped
    3 / 3
    Points
    956
    Level
    7

    Re: FM RECEIVER - simple diagram needed

    Simple circuit using IC CA1619, Go http://www.digchip.com/datasheets/pa...1619BS-pdf.php



    •   Alt9th December 2009, 05:03

      advertising

        
       

  9. #9
    Advanced Member level 5
    Points: 29,459, Level: 41
    Achievements:
    7 years registered
    Audioguru's Avatar
    Join Date
    Jan 2008
    Location
    Toronto area of Canada
    Posts
    4,814
    Helped
    1033 / 1033
    Points
    29,459
    Level
    41

    Re: FM RECEIVER - simple diagram needed

    Quote Originally Posted by sabu745
    I have two Sony Walkman FM stereo radios that are 29 years old. They use a newer chip instead of that obsolete one. Its poor performance is the same as a cheap clock radio.



    •   Alt9th December 2009, 17:57

      advertising

        
       

  10. #10
    Full Member level 5
    Points: 3,948, Level: 14

    Join Date
    Aug 2001
    Location
    Argentina
    Posts
    285
    Helped
    27 / 27
    Points
    3,948
    Level
    14

    Re: FM RECEIVER - simple diagram needed

    Use the TDA7000 it's easy to implement and very good option. I really don't know if it is obsolete, but in my country you can still get it.



  11. #11
    Advanced Member level 2
    Points: 9,691, Level: 23
    hameeds01's Avatar
    Join Date
    Aug 2005
    Location
    Islamabad Pakistan
    Posts
    599
    Helped
    76 / 76
    Points
    9,691
    Level
    23

    Re: FM RECEIVER - simple diagram needed




  12. #12
    Advanced Member level 5
    Points: 29,459, Level: 41
    Achievements:
    7 years registered
    Audioguru's Avatar
    Join Date
    Jan 2008
    Location
    Toronto area of Canada
    Posts
    4,814
    Helped
    1033 / 1033
    Points
    29,459
    Level
    41

    FM RECEIVER - simple diagram needed

    The TDA7000 was a very poor FM radio. It is not made anymore and is replaced by the TDA7088 that "scans" for changing stations. Its performance is just as bad.



  13. #13
    Full Member level 5
    Points: 7,345, Level: 20
    zlatkoMM's Avatar
    Join Date
    Apr 2008
    Location
    Croatia
    Posts
    271
    Helped
    12 / 12
    Points
    7,345
    Level
    20

    Re: FM RECEIVER - simple diagram needed

    Same story talk Audioguru - everything someone suggest he call garbage.
    Garbage Man...ha ha
    Simpliest solution is one Fet radio which give solid result for such a small device
    and of course Silab chip is very good option.



  14. #14
    Advanced Member level 5
    Points: 29,459, Level: 41
    Achievements:
    7 years registered
    Audioguru's Avatar
    Join Date
    Jan 2008
    Location
    Toronto area of Canada
    Posts
    4,814
    Helped
    1033 / 1033
    Points
    29,459
    Level
    41

    FM RECEIVER - simple diagram needed

    Good FM radios have a 10.7MHz IF amplifier with crystal filters. The TDA7000 and TDA7088 have opamp active filters operating at only 70kHz for the IF amplifier.
    A huge difference.



  15. #15
    Newbie level 4
    Points: 1,086, Level: 7
    original's Avatar
    Join Date
    Oct 2008
    Location
    Occupied Iran
    Posts
    5
    Helped
    0 / 0
    Points
    1,086
    Level
    7

    Re: FM RECEIVER - simple diagram needed

    Hi

    please see under link, you will see some simple project for fm receiver :

    http://pll.ir/fa/index.php?option=co...&Itemid=86.php

    regards



  16. #16
    Advanced Member level 5
    Points: 35,749, Level: 46
    Tahmid's Avatar
    Join Date
    Jun 2008
    Location
    Cornell University, Ithaca, New York, USA (from Dhaka, Bangladesh)
    Posts
    4,730
    Helped
    1697 / 1697
    Points
    35,749
    Level
    46
    Blog Entries
    19

    FM RECEIVER - simple diagram needed

    Everyone's suggested TDA7000, take a look at TDA7088 as well. Has automatic scanning with switches.



  17. #17
    Advanced Member level 5
    Points: 29,459, Level: 41
    Achievements:
    7 years registered
    Audioguru's Avatar
    Join Date
    Jan 2008
    Location
    Toronto area of Canada
    Posts
    4,814
    Helped
    1033 / 1033
    Points
    29,459
    Level
    41

    FM RECEIVER - simple diagram needed

    I answered but this site did not post my answer.
    Thee obsolete TDA7000 and newer TDA7088 "radios" have terrible performance.



  18. #18
    Advanced Member level 5
    Points: 35,749, Level: 46
    Tahmid's Avatar
    Join Date
    Jun 2008
    Location
    Cornell University, Ithaca, New York, USA (from Dhaka, Bangladesh)
    Posts
    4,730
    Helped
    1697 / 1697
    Points
    35,749
    Level
    46
    Blog Entries
    19

    FM RECEIVER - simple diagram needed

    Hi audioguru,
    I have a small pocket radio I bought about a year back. Once I opened it and saw the TDA7088 chip. But the performance of the radio is quite good. Good reception as well as clear audio output. It sounds really good to me. And it's also quite popular over here. Costs about $0.5 - $2. I got mine for $1.5.



  19. #19
    Super Moderator
    Points: 40,638, Level: 49

    Join Date
    Jul 2009
    Location
    Aberdyfi, West Wales, UK
    Posts
    6,848
    Helped
    2127 / 2127
    Points
    40,638
    Level
    49

    Re: FM RECEIVER - simple diagram needed

    I think the point Audioguru is making is that in these days of cutting costs to the bone, a lot of quality has been sacrificed just to save a few pennies.

    Although the quality of the TDA7000, TDA7088, SC108 and others is reasonably good, they will never match the performance of designs that use properly filtered IF stages and linear discriminators. Those ICs have poor overload characteristics, poor phase response and audio distortion figures many times greater than is achievable with just a few extra components. In other words, the manufacturer has designed them for lowest cost rather than highest quality. Whether that is acceptable is of course a decision to be made by the end user. My own choice would be $5 for a high quality receiver rather than $2 for a poor one.

    Brian.



  20. #20
    Advanced Member level 5
    Points: 35,749, Level: 46
    Tahmid's Avatar
    Join Date
    Jun 2008
    Location
    Cornell University, Ithaca, New York, USA (from Dhaka, Bangladesh)
    Posts
    4,730
    Helped
    1697 / 1697
    Points
    35,749
    Level
    46
    Blog Entries
    19

    FM RECEIVER - simple diagram needed

    o, ok, that's what he meant. I was just stating that the quality is reasonably well. It's acceptable as I get clear output and that's all that matters to me. Although I must say I am really impressed by the radios in the Sony Ericsson and Nokia cell phones.



+ Post New Thread
Please login
Page 1 of 2 12 LastLast