I have a cheap MP3 player that runs on 1 AA cell. I'd like to power it off a wall wort 3 volt AC to DC converter I have. I'd also like to have a battery in the circuit so that if house power is lost, the player will continue uninterrupted off the battery. The player is going to provide background music and music on hold through a small telephone system. The problem with just running off a converter is that after any type of power interruption, the "play" button on the MP3 player has to be pressed to get it working again. The circuit should be designed in such a way as to keep the battery charged and power the player off the converter except when the power goes off.
Any ideas?
Any ideas?