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Small (20 mm) speaker, 0.5W
Small speaker:
Simplest connection is to just connect speaker to Arduino. Limit 40 mA per digital output on Arduino UNO is enought to power spearker (not to loud) without danger destroying speaker. See by Your self:
You can download sketch from static.nettigo.pl/imperial.zip. Code is taken from this Instructable
Once, twice in month we will send You info about new products, products on sale and news from Arduino and DIY world.