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BackHttps://product.tdk.com/info/en/catalog/datasheets/piezoelectronic_buzzer_ps_en.pdf piezo buzzer self drive oscillator magnetic transducer buzzer, 5V, SPL of 100.
- Hole 4.5mm, height 9, Wuerth electronics 9774025360 (https://katalog.we-online.de/em/datasheet/9774025360.pdf.
- 4.0x4.0x2.6mm, https://www.sunlordinc.com/UploadFiles/PDF_Cat/20120704094224784.pdf Inductor, Sunlord, MWSA1204S-220.