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Amazon.com: JBtek 8 Channel DC 5V Relay Module for Arduino Raspberry Pi DSP AVR PIC ARM : Electronics
Amazon.com: AEDIKO 8 Channel Relay Module DC 5V Relay Board with OPTO-Isolated Support High or Low Level Trigger : Automotive
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Lesson 67: Controlling 8 channel relay with a 4x3 keypad to control 4 AC or DC loads - YouTube
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