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![SOLVED] 5v 8 channel relay board - external power source problem. - General Electronics - Arduino Forum](https://europe1.discourse-cdn.com/arduino/original/4X/3/4/e/34e1d2e91c6c142d8118cc26abcfbc1af627aed4.jpeg "SOLVED] 5v 8 channel relay board - external power source problem. - General Electronics - Arduino Forum")