Quick question (hopefully!). I'm new to electronics, but getting quite interested. Coming from a programming background, it's always interested me...
Anyway. I have a circuit with two DC Power sources, one is 12V the other is 7.2. I have a regulator which turns that down to 5V. Now, the 12V power source isn't always available. The 7.2V however, is always available. But I would like to build a circuit that will use the 12V if it's there, and 'fall back' to the 7.2 if it isn't.
Once I have this sussed, I need to have a look into re-charging the 7.2V battery from the 12V source when it's available, but that is a problem for another day!
It sounds simple, but I'm guessing it isn't? Please help. :)