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Assistance in decoding a circuit diagram

Discussion in 'Electronics Homework Help' started by yolo, Oct 28, 2019.

  1. Harald Kapp

    Harald Kapp Moderator Moderator

    9,361
    1,900
    Nov 17, 2011
    A cheap multimeter is one of the first investments in this hobby. Without it you'll be lost when it comes to finding faults in your circuits.
     
  2. yolo

    yolo

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    0
    Oct 28, 2019
    Okay I'll buy that capacitor. I cannot go for a kit now because I already bought other components and I cannot afford another kit now. Since this is a school project, I have very less budget to work with. That's why I preferred not to go with a kit as they are costlier than building from scratch.
     
  3. yolo

    yolo

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    Oct 28, 2019
    @Harald Kapp check out the YouTube video link at 1:07 . I guess you will know how to connect the variable capacitor then. I could not figure out by looking at the video.
     
  4. BobK

    BobK

    7,642
    1,662
    Jan 5, 2010
    I agree that two of the pins might be connected together. You can determine that using any little circuit, like an led and try connecting one side of the battery through any two connections on the capacitor.

    Bob
     
    Harald Kapp likes this.
  5. Audioguru

    Audioguru

    2,605
    586
    Sep 24, 2016
    That circuit is the simplest, worst quality FM radio that I have ever seen and it is missing most parts that are in a real FM radio.
    I think a radio kit will be the best for you to learn how to solder its parts to a circuit board that has a correct layout. It will have the correct parts and will have a good design of a real FM radio circuit that works well.
     
  6. mike wax

    mike wax

    33
    1
    Oct 10, 2016
    if you can't get a meter, you can still get a primitive continuity tester. Get a 12V battery and a wire and short the negative and positive terminals together. It will make a spark when you try to connect the wire from one pole to the other. The spark tells you that the wire is conducting some current. This will also work with a 9V battery but the spark will be really small. Or with a li-ion battery but the spark will be really BIG so you must use a REALLY small wire.
    So now if you have a 3-terminal cap, then you use the same method to see if two of the terminals are connected together. They will pass current from one to the other. It won't damage the cap.
    But if the 3rd lead is just an anchor lead and is not connected to either side of the cap, then you have a problem.
    of course you could also look for the data sheet for the cap in question. if you know the make of the part.
     
  7. yolo

    yolo

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    Oct 28, 2019
    [​IMG] I got this from some website. Can someone figure out what it says? I guess it should say that two collinear pins are short together . Can someone confirm?
     
  8. Audioguru

    Audioguru

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    Sep 24, 2016
    Yes, the two pins at the sides are common (connected together). The pin at the front is the other connection to this variable capacitor.
     
  9. yolo

    yolo

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    Oct 28, 2019
  10. yolo

    yolo

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    Oct 28, 2019
    Finally completed the project guys. Thanks a lot for your help. It works but very very mildly. That'd be enough for my project. Without your assistance I couldn't have done it. It costed 300 rupees which translates to 4 dollars approx so it's really coat effective which was my motto from the beginning. Now I've to figure out how all the parts work together to make this radio work. Any help would be really appreciated. Thanks again guys.
     
  11. bertus

    bertus

    36
    12
    Friday
  12. yolo

    yolo

    17
    0
    Oct 28, 2019
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