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10Pcs 4 channels iic i2c logic level converter bi-directional module 3.3v to 5v shifter for arduino | Fruugo FR
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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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Amazon.com: SparkFun Logic Level Converter - Bi-Directional step down 5V signals to 3.3V AND steps up 3.3V to 5V Board Dimensions: 0.63 x 0.52" (16.05 x 13.33mm) : Industrial & Scientific
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