I've fed the ArduinoBT with 3 9V batteries (parallel connection) and a lm7805 voltage regulator (this thing keeps the output voltage at 5V - http://www.eidusa.com/Electronics_Voltage_Regulator.htm
Before that I was powering the board with just one 1,5V battery for some simple tests.
I noticed that the board does a strange noise with the 9V batteries, that didnt happen with the 1.5V baterry.
Is this normal? Do your boards make any noises at all?
I connected the 3 9V baterries in order to get more current power (more mAs) coz the 1.5V batteries didnt last for long. Do the boards work with specific current values(mAs)? The main site didnt say anything about mAs for the BT board