XD555
CMOSタイマーIC　XD555
https://akizukidenshi.com/catalog/g/g117629
秋月電子通商
通販コード：I-17629
￥40（税込）1F 10 売場 キャビネット上段
https://scrapbox.io/files/63d2097c0cb835001dcdb409.png
https://gyazo.com/b3b2793c914b11e9deee9bbed1a5e1c6
https://gyazo.com/ccc5271ba107efa00b6ff91ce80c8abf
https://akizukidenshi.com/goodsaffix/XD555.pdf
https://www.zea.jp/audio/schematic/sc_file/018.htm
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https://gyazo.com/6442e00af5980edaf09267e6f052e336
1.44 / ( 1k + 3.3k + 3.3k) 0 .22
7600 x 0.00000022
0.001672 861Hz
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8Pin