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4-channel I2C-safe Bi-directional Logic Level Converter [BSS138] : ID 757 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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DEBO LOGIC 4CH: Developer boards - bidirectional logic level converter, 4-channe at reichelt elektronik
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Logic Level Shifter Logic Level Converter Voltage Level-shifting Translator Module 8-bit Bi-directional For Arduino - Industrial Computer & Accessories - AliExpress
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