4-20mA Signal Generator, 4-20mA Current Generator Adjustable Analog Quantity Current Signal Generator Module for PLC, Frequency Converter, Servo: Amazon.com: Industrial & Scientific
Amazon.com: 24v power supply
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SMaBiT (Bitron Video Flush-Mounted Power Supply 12V 1A for CCTV Cameras AN7429/E03: Amazon.de: Electronics & Photo