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Hello,

Please tell me where I can buy a buzzer compatible with FMB140.

Thanks !!!

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Hello.

As DOUT output is open collector output, when it is activated there is GND on it. It simplifies connection of external devices like buzzers, diodes etc.

You can connect any buzzer, just connect positive wire of your buzzer to power supply positive and GND to device DOUT.

Regards
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