BOE VFD48-1202FN, Руководство по сборке

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Step 9: Buzzer part
Buzzer Part is easy, first solder the [G21] Digital Transistor
(Note: If damaged this component, you can replace it with the
SI2302[A2SHB] N-MOSFET);Then Solder the buzzer part, we have two
types of the buzzer, one is the SMD Version, the other is the
DIP version, please solder the one which you find in the KIT.