600ma sounds about right. But i'm not sure if the 1a actually controls the relays in that the board has a 5v input, i think this only powers the indicator lights and such. This 5v input is the only thing the 1a is connected to. So if the relays aren't powered by it's own 5v input then the 600ma for the actual relays, comes through the UNO's 8 digital ports controlling them, meaning the 2.5a looses another 600ma. Wich could count for my loss of sms control through TC35 when too many relays are high. Does this give any meaning to you?
Regarding the humming and thermal shutdown of the regulator. I'm digging for a 6v 1a that should be the end of the heat problem, atleast the dimming of indicator lights should take longer and reveal if it's low amps or/and the regulator.
Regarding the 12v relay board. If the digital ports on UNO outputs 5v do i need to put a capasitator (i think they are called) between?
Thanks.