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5v 4 channel relay with optocoupler electronics and robotics enthusiasts who require and robotics enthusiasts who require a reliable Get the best price on 3 Series 20A 18650 Lithium Battery Protection Board 11 and dedicated technical support via email and WhatsApp Optocoupler Isolation: Each channel uses an 817C optocoupler to electrically isolate the microcontroller from the high voltage relay coil
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