Toslink 3 in 1 out switch

Hi all,
Do you know how to make this switch?

Here is some pic I got from internet

I know that it use cd4052 chip, do anyone know the schematic?


有冇師兄可以幫手
我要買乜野零件, 同邊到買?
仲有可唔可以講解線路圖
先謝

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