hello everyone, i'm working on a project that will be made of 6 solenoid valves controlled by a relay module and each solenoid will need 12 volt and 120mA. i was thinking of using PC power supply for having 5 volt for the arduino and 12 volt for the valves, but the power supply will supply 5 volt with 15 amp and 12 volt with 13 amp. i'm not sure weather if those high current will damage the project or not?
need help.
below i attached the datasheet for the power supply
No, that's just the amount that it is capable of making. The devices you connect will only use the amount of current that they need.
According to this label, your power supply is rated at 5.0 Amps input. But you are going to plug it into a 10 or 15 Amp wall socket, aren't you? Won't that damage the power supply?
PC power supplies need a minimum load on the 5V and 12V rails if they are to regulate properly.
Just an Arduino on the 5V rail wont draw enough current .
You will need some kind of load permanantly connected to the 5V rail, try 10 ohms or less.