How can one determine what ac to dc power supply to use on a device that was originally powered by a 9 volt battery? Answered
I'm trying to make an intercom system using some arduino uno modules, and a wireless phone system. While the phones in the system normally run off of 2.4v 700mAh batteries, I want to simply 86 the batteries and use the arduino modules or power adapters to supply them. So what sort of power adapter specs (i.e. voltage and current ratings) should I use?