I have extend existing circuit design by adding a 12V relay to it. AT the moment both 5V and 12V circuit are side by side. This doesn't work well. Intermitent device failure happen.
I would appreciate opinion and instruction on how to isolate these two circuit. I already have some idea to put the relay and it 12V voltage supply on another board. But I have no idea whether this will work or not.
Thanks in advance