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Fevas TCS230 Color Recognition Sensor (Static Recognition) Output Frequency Signal: Amazon.com: Industrial & Scientific
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Frequency Converter AD831 Single Chip High Frequency RF Mixer Radio Frequency Conversion Module for HF and VHF Receiver, 0.1-500MHz: Amazon.com: Industrial & Scientific
Amazon.com: 7.83Hz Schumann Wave Generator, Ultra-Low Frequency Pulse Generator Module DC 12V 1.5A 7.83Hz Schumann Wave Generator Module : Patio, Lawn & Garden
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