I see 7V is the recommended minimum for powering these boards through the small barrel plug. But I would also like to power ssr’s using the same power supply if possible. These are the standard Opto-22 thin ssr’s as I think they are known as, or specifically 1781-OB5S modules from western reserve controls. The logic input on these is 5V, and I have been able to dig and find the maximum is 7V. I dont want to overpower the relays too much, so does powering both the boards and the relays using a shared 6V power supply seem reasonable? Is there really an issue dropping below the 7V recommended for the Mega? The board will be running about 16 ssrs and thats it. Or the alternate is to just use two power supplies at 5V and 7.5V for the ssrs and mega.