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HiLetgo Si5351 Si5351A I2C IIC High Frequency Signal Generator Square Wave Frequency Generator 3.3-5V 8KHz -160MHz for Arduino: Amazon.com: Industrial & Scientific
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Amazon.com: DEVMO MT8870 DTMF Voice Decoder Telephone/Audio Decoder Speech Decoding Module with Vehicle Multi-Frequency Decoder Chip MT8870 : Electronics
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