Unsurprisingly, it’s an epoxy blob’d chip that does just about everything! For the background music, a disc piezo is used to make the beeps. We’ve covered magnetic buzzers before on the Great Search, which we use on some of our design for SMT tone-making.
At a 500K build, budget is going to be the most important concern, so instead, we can go for a ultra low cost piezo disc! Let’s take a look at what is available at DigiKey and the differences between magnetic and piezo buzzers.
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