What is the A/C power supply for a CE1177 from National Geography. My unit takes three AAA batteries instead of what seems to be the usual 2 AAA. I would think any converter that runs 110 V A/C to (3 x 1.5V) 4.5V DC will work?

Verify the polarity before using any power supply (http://smpstroubleshooting.com/) for your CE1177.