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Thread: PixelRadio, a DiY FM Transmitter with RDS RadioText

  1. #421
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    I have a couple of IRF540N from a different project. Would the IRF540N work as a replacement for the IRLZ24NPbF? From the specs I would think so but I am not sure.

    https://www.infineon.com/cms/en/prod...annel/irf540n/

    Also does the board accommodate 1/4W or is the board designed for the smaller 1/8W resistors? I guess I could always mount them vertically but if this project also expects the smaller ones I might just buy a set.

  2. #422
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    Would the IRF540N work as a replacement for the IRLZ24NPbF?
    Not a recommended sub. The IRF540N gate threshold is 4V. The ESP32 logic high is only 3.3V. So it's not a compatible MOSFET. If you will be using the optional "On Air" LED sign then you'll need to stuff a IRLZ24NPbF.

    Also does the board accommodate 1/4W or is the board designed for the smaller 1/8W resistors?
    One builder reported using 1/4W. They were satisfied with how it looked. However, I think you can get an assortment of 1/8W 5% from AliExpress for just a few dollars.

    - Thomas

  3. #423
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    Quote Originally Posted by TomL8345 View Post
    I have one or two extra PCB's for PixelRadio. If you would like one PM me.
    All gone, Sorry!
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  4. #424
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    Any good links to the external on air signs from anyone?

    Additionally, is the on-air sign similarly hooked up like the LED is so that it turns on when sensing music through the jack?

    Thanks!


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  5. #425
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    Any good links to the external on air signs from anyone?
    If you want a desk top version then this LED sign looks good: https://www.aliexpress.us/item/2252799820237618.html
    For scale, this photo shows the 12V W300xH200mm version:



    For outdoor installations you can build your own 12V sign using a backboard populated with LEDs that spell "ON AIR, TUNE TO FM 88.9." Or paint a big sign and illuminate it with bright 12V LED spotlights (that are controlled by PixelRadio).

    is the on-air sign similarly hooked up like the LED is so that it turns on when sensing music through the jack?
    The external On Air sign control port is synced with the front panel LED. They both turn on whenever the RF carrier is active and the test tone mode is disabled (Music Source enabled).
    https://github.com/thomastech/PixelR...re#on-air-sign

    - Thomas

  6. #426
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    Not getting audio or test tones using the Soundblaster 3. I've set things up in the FPP plugin also.
    sb3.png
    on air.png
    What am I missing?

    UPDATE: Turned off Stereo and used Mono and things seem to be ok.
    Last edited by Kev7274; 01-24-2023 at 06:57 PM.
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  7. #427
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    UPDATE: Turned off Stereo and used Mono and things seem to be ok.
    That is an unexpected solution. Especially since the test tones are independent of the external audio.

    At this point it's a mystery on why you need to use the mono broadcast mode. But check / resolder U8, C8, C9, and the QN8027 module. Use the test tones during your troubleshooting since that would eliminate any issues related to external audio.

    - Thomas

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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    Quote Originally Posted by ThomasLED View Post
    That is an unexpected solution. Especially since the test tones are independent of the external audio.

    At this point it's a mystery on why you need to use the mono broadcast mode. But check / resolder U8, C8, C9, and the QN8027 module. Use the test tones during your troubleshooting since that would eliminate any issues related to external audio.

    - Thomas
    Ok,using the test tones or audio from the Soundblaster,the audio has alot of static on Stereo. Using mono,the static is there,but way less. I'll have to troubleshoot more tomorrow.
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  9. #429
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    Using mono,the static is there,but way less.
    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

  10. #430
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    Quote Originally Posted by munu View Post
    <snip>
    Also does the board accommodate 1/4W or is the board designed for the smaller 1/8W resistors? I guess I could always mount them vertically but if this project also expects the smaller ones I might just buy a set.
    To answer my own question, the board is designed for 1/8W resistors. 1/4W resistors won't lay flat unless you do some bending or mount them vertically. I got my 1/8W resistors today so all is good

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