I am some what new to electronics. I have been designing a variable bench power supply from an ATX.
I want to add two output power switches: One to the low current low voltage variable output rail (min 1.8 V 20 mA and max 12 V and 3A) and another to a higher voltage and current output (min 5 V 800 mA max 30 V 10 A.) These two outputs will be accomplished by two different DC-DC converters. Both “rails” will be isolated from each other via an on-off-on toggle power switch, so both rails won’t be used simultaneously. A 12V PSU will be added to drive the meters and possibly the switches as well.
I have been looking into relays and also using MOSFETs as switches.
So the question:
- What kind of switch would better suit my needs?
- Any other idea besides relay or MOSFETs as switch?
- If I use MOSFETs, how do I choose the right one for a variable voltage and current?
I hope I was clear enough and provided sufficient information.