Hi there, sorry for my terrible English, but i do have a little problem:
I use Arduino MEGA and W5100 to control 25 relays(OMRON G5LA 5VDC). But it seems too many relays made my voltage drop down. And when voltage drop down, my W5100 doesn't work properly. I use a 220VAC-->5VDC 20A regulator, but there is about only 4.5V when I measured. On PCB, I wired the vcc of Arduino, W5100's regulator and relay together with 5VDC input. I think my 5V regulator is good enough(expensive enough actually
I have some ideas like: buy a higher voltage regulator(like 9VDC) or buy another 5V regulator for circuits except relays. But i don't actually know whether it will work out fine.
Does anyone has some ideas how to solve voltage drop down?