Hello,
I'm trying to find a replacement power supply for an old game machine. The original is a giant brick, and I think a modern switching power supply can fit inside the unit its self.
But, I've been searching around and I can't really find a solution.
I need:
+ 12 volts at 0.3 amps
+ 5 volts at 0.9 amps
- 5 volts at 0.1 amps
and all sharing a common ground.
I was thinking I could use one of those generic 12 volt power supplies and a LM7805 and a LM7905, and while that would provide the + 12 and +5, the LM7905 just doesn't work that way.
Since the 3 of those share a common ground, I don't think I can run the 5 volt supplies off of the 12 volt supply at all.
So now I'm wondering what my best option is? To use a little 12 volt power supply and two iPhone chargers (5 volt very regulated power supplies)?
Ideally, I'd like to have just one power supply that can provide all of that. It's not a whole lot of power that's needed, especially on the -5 volt rail.
I'm just looking for the simplest answer at this point.
Thank you!
I'm trying to find a replacement power supply for an old game machine. The original is a giant brick, and I think a modern switching power supply can fit inside the unit its self.
But, I've been searching around and I can't really find a solution.
I need:
+ 12 volts at 0.3 amps
+ 5 volts at 0.9 amps
- 5 volts at 0.1 amps
and all sharing a common ground.
I was thinking I could use one of those generic 12 volt power supplies and a LM7805 and a LM7905, and while that would provide the + 12 and +5, the LM7905 just doesn't work that way.
Since the 3 of those share a common ground, I don't think I can run the 5 volt supplies off of the 12 volt supply at all.
So now I'm wondering what my best option is? To use a little 12 volt power supply and two iPhone chargers (5 volt very regulated power supplies)?
Ideally, I'd like to have just one power supply that can provide all of that. It's not a whole lot of power that's needed, especially on the -5 volt rail.
I'm just looking for the simplest answer at this point.
Thank you!