Hello, I have a big problem. I'm making a school project using sensors, releys (5v), transistor, leds, lcd, etc. The purpose of the project is to use the relays to control a 120V with my arduino so i can control a small water pump. My problem is everytime the reley activates and deactivates it makes…

Noise in ground by Reley

MarkT October 29, 2012, 4:08pm 2

You have a free-wheel diode across the relay winding don't you? That's absolutely essential.

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