Active buzzers are easy. Just apply 5V to them and they buzz.
Affiliate link ads. First ones shown are the type that I have from kits. usually labeled as 5V buzzer. The following ones are apparently 3-24V, which may be more appealing.
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- Information on this site is not guaranteed to be accurate. Always consult the manufacturer info/datasheet of parts you use. Research the proper safety precautions for everything you do.