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I modified a child's toy so that it could play a musical horn. I think it can be used in other applications, so please give it a try. List of items used this time (Amazon link) Plarail (2000 series μSky) https://amzn.to/4bZ5TpC DFPlayerMini (5 pieces) *Items used this time https://amzn.to/3V4xM8W There are also other items sold in units of 1-2, but the unit price is a little higher. I used reed switches and speakers that I had on hand. Reed switch (Amazon) https://amzn.to/3yTV9dG The DFPlayer amplifier is about 3W, so choose a speaker that is less than that and can be incorporated in terms of size. I think this will fit. (Amazon) https://amzn.to/3yFEuul The sound source used is from the Meitetsu website here. ※On the website, Meitetsu Library https://www.meitetsu.co.jp/library/ro... Narration: VoiceVox Subtitles: Vrew #diy #electronics #Meitetsu #musichorn #Plarail