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Amazon.com: JBtek 8 Channel DC 5V Relay Module for Arduino Raspberry Pi DSP AVR PIC ARM : Electronics
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8 Relay Module Shield 10A With Optocoupler Inputs 3-24V
8 Channel 12V Relay Board with Optocoupler at rajguruelectronics.com
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8 Channel 5V Relay Shield Module - RobotShop
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