AA Battery Emulating Transformer?
One of my many hobbies is collecting tabletop water fountains. I have about 6 fountains, two independently powered and 4 that run on 2 AA batteries. Since I have these fountains on all the time, as you can imagine they are costly to power. One day I finally got sick of putting new batteries in these things and rewired their battery wires in a parallel circuit for running on DC power from a wall. Now the only thing I need is a power supply.
Now, motors aren't too picky about voltage. They'll operate on different voltages but if it isn't just right the motor will be too loud or too weak to pump the water correctly. This rules out and transformers I have in my bin. Upon measuring the current from the 4 fountains, I found that it uses about 440mA. I have kept my eyes open for a good power supply but have not yet seen one. I've also toyed around with the idea of using the closest one I have (Nokia 3.7v 500~?mA) and applying a voltage regulator on it, but I don't want to buy one yet as I am still a novice at some of the mechanics of most electrical components. Would that be an effective plan?
If not, any other ideas? My fountains haven't turned on in a few weeks and there are starting to urge for the sweet trickle of water down their dry, dusty flumes.