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Thread: PixelRadio, a DiY FM Transmitter with RDS RadioText

  1. #431
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    Sorry if this was asked before but there are like 43 pages in this thread. As you can see from the picture I am still working on the board. Terrible soldering (ordered some flux because the solder puddled up high on the soldering iron). My question is regarding the housing, though. There are no guides to put the board in. The board is also a couple of mm to large to squeeze it in (you can see how the housing is actually bending). I have some 'stand off screws' to elevate the board but the fact that it doesn't fit into the housing suggest I am doing something wrong.

    board.png

    Never mind, I see there is a groove at the very bottom of the case...
    Last edited by munu; 01-27-2023 at 01:16 AM.

  2. #432
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    Quote Originally Posted by munu View Post
    Sorry if this was asked before but there are like 43 pages in this thread. As you can see from the picture I am still working on the board. Terrible soldering (ordered some flux because the solder puddled up high on the soldering iron). My question is regarding the housing, though. There are no guides to put the board in. The board is also a couple of mm to large to squeeze it in (you can see how the housing is actually bending). I have some 'stand off screws' to elevate the board but the fact that it doesn't fit into the housing suggest I am doing something wrong.

    board.png

    Never mind, I see there is a groove at the very bottom of the case...
    Hey, don't feel bad. If that is the only mistake you make, your GOOD!

  3. #433
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    Quote Originally Posted by ThomasLED View Post
    Mono mode disables the FM pilot tone and reduces RF bandwidth (better S/N). This improves reception of weak signals and is the main reason the feature exists.

    But if you need stereo audio then there might be an easy remedy. For example, perhaps this issue is interference from an adjacent FM broadcaster or dirty RF source. Try tuning to other unused areas of the FM dial. Also try moving the receiver to other test locations that provide better reception. In some situations merely changing antenna position may help.

    - Thomas
    Re-flowed those those parts I saw,didn't see a U8 on the board or in the BOM,unless I overlooked it,and it didn't make a difference. I did however notice that when my hand or finger was near or touching the L7 jumper wire,there was almost complete silence on Stereo mode.
    Last edited by Kev7274; 01-27-2023 at 07:28 PM.
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  4. #434
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    I just be doing something wrong but I am not sure what. C3, the cap in the upper middle is a lot smaller than what the PCB indicates. But it is 100uF/16V from what I can read. Also C10 (lower right) is a lot smaller than the reference image shows. It's a bit confusing because C10 is supposed to be 0.01uF/50V and the other 3 around it are supposed to be 0.01uF/50V so they should be larger. Is C10 just oversized in the reference image (something like 63V or higher)?

    20230128_082807.png
    Attached Images Attached Images

  5. #435
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    C-10 is .01 uF 50V and C-4,C-5 and C-11 are .1 uF 50V so yes C-10 is larger.
    20230128_155505.jpg
    And C-3 is 100uF 16V
    20230128_155513.jpg
    You are not doing anything wrong. I don't want to speak for Thomas but I assume he made changes and for whatever reason the Gerber files were not updated to reflect the changes or something entirely different, but if you stick to the parts list you should be OK.

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