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As the question says, i can't figure out where the sound comes from on this board that i bought, nothing on the manuals and can't see any speaker on the board... It is a "RFID Proximity Entry Door Secure Lock Access Control System"

Thanks.

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  • What component is under the "Remove Seal After Washing" seal? Is it a buzzer? – VE7JRO Oct 23 '18 at 19:28
  • @VE7JRO Updated the post :) – Manel Alonso Oct 23 '18 at 19:31
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    all you have to do is to put your finger on the component when it is making a sound and you will quickly discover if you are touching the correct component – jsotola Oct 23 '18 at 20:13
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this is a PCB mountable piezo buzzer. it makes sound in your "RFID Proximity Entry Door Secure Lock Access Control System"

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That looks like a piezo buzzer, the component that had the sticker on it. It's likely louder now, with the sticker removed.

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