I have been designing a project that requires a 5V for some components and 12V for others. I am planning to leave this plugged in 24/7 so I want it pretty efficient. I know they don't waste that much energy, but I still want to make it as energy efficient as possible even if I don't notice a difference in my energy bill.
[A.K.A. This is for a friend that read somewhere wall warts waste tons of energy, but if it makes them happy, I might as well do it. I have seen this: How much power is really wasted by a wall wart? but my friend isn't happy with that. I just want a power efficient source. Also, this isn't related to How can I reduce power consumption of my device? because that is saving energy in theory.]
I have a couple of options to use:
- Buy a 5V and a 12V adapter. Connect the grounds.
- Buy a 12V adapter and use a voltage regulator and a cap.
Which one is better? Do some adapters/adapter types waste less energy?
Another problem is I might need 1/2A for the 12V circuit which is only going to be used 5% of the time. Does the higher amp converters use more energy when idle? Suggestions? I don't want to use relays because they would be dangerous. I would need less than .5A for the 5V one. Do I need to pick out adapters?