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Hi, have anyebody had trouble building the ELENCO 108 AM/FM RADIO KIT

Discussion in 'General Electronics Discussion' started by michael1978, Jul 15, 2018.

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  1. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    Hello, i build the radio like they say in the book, and i did everything with VOM(testing with only multimeter),
    everything was like in book , but when i finish, i switch to am or fm, i just hear high noise
    :(
    I Measure, Test Point, without connection a speaker(because i thought the speaker was bad, so i desoldeer, and i connect with wire other speaker 8ohm but the same problem stays),
    so
    i switch to FM
    tp15 and tp2=2.74V
    tp15 and tp13=1.4V
    tp15 and tp11=6.59V
    tp15 and tp10=1.20V
    tp15 and tp9=7.08V
    tp15 and tp8=6.43V
    tp15 and tp12=6.74V
    i switch to am
    tp15 and tp2=0.02V
    tp15 and tp3=7.77V
    tp15 and tp1=4.21V
    tp15 and tp4=8.13V
    tp15 and tp5=1.34V
    tp15 and tp6= 8.7V
    tp15 and tp14'=0.02V
    TP15=GND
     
  2. kellys_eye

    kellys_eye

    4,275
    1,147
    Jun 25, 2010
    Schematic?

    Usually, with these self-build kits, it's nearly always a mistake with assembly.

    Double-check everything.
     
  3. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    I test it, but what do you thing, it can be maybe from lm386, because i soldeer it direct without the holder(socket)?
    it possible that i destroyd lm386? AND FOR THAT IS NOT WORKING
     
  4. davenn

    davenn Moderator

    13,866
    1,958
    Sep 5, 2009
    Again ... you were asked for schematic
     
  5. kellys_eye

    kellys_eye

    4,275
    1,147
    Jun 25, 2010
    The LM386 isn't a static sensitive device and you'd have to really butcher your soldering to overheat it. Assuming you soldered it in the correct orientation it is probably ok.
     
  6. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    Yes in correct place i soldeer it, but what for problem is? what do you think?
     
  7. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    Here is schematic, if somebody can help me, now i change something and only low noise no signal
     

    Attached Files:

  8. kellys_eye

    kellys_eye

    4,275
    1,147
    Jun 25, 2010
    Show a (clear) picture of the assembled board.
     
  9. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    i can show you tomorow no problem?
     
  10. michael1978

    michael1978

    388
    2
    Mar 17, 2012
  11. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,497
    2,839
    Jan 21, 2010
    Wow, that's helpful.
     
  12. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    yes but he does not work...……..
     
  13. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    Hi, i did not make so good picture, so i make a photo, i dont have photoshop to change a little bit contrast,
    here is the picture
    IMG_20180716_002650.jpg IMG_20180716_002812.jpg
     
  14. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,497
    2,839
    Jan 21, 2010
    You need to take photos we can use. Have a look here for information on taking good photographs.

    You're probably also going to have to note the part numbers of components (like transistors) where we won't be able to see them on your photo.
     
  15. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    This the best i can do
    1.jpg 2.jpg
     
  16. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,497
    2,839
    Jan 21, 2010
    There is a lot of motion blur in those photos, so they aren't really useful.

    What I can see is that you seem to have filled leads over before soldering them, and have failed to trim them properly.

    I recommend that you trim the leads, and then take photos where the light is better, or find a way of ensuring the camera doesn't move during the exposure.

    Meanwhile, have you checked every component to make sure you put the right ones in the right places?
     
  17. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    You mean to put a little bit soldeer?, i was think it is more good if you soldeer it like this:(
     
  18. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    I forget to tell you, when i did step by step like in book, i have measure everything was like in book the result, but i dont know what wrong
     
  19. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,497
    2,839
    Jan 21, 2010
    What part of "trim the leads" did you think meant "add more solder"?
     
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