My project is a music box controlled by a UNO and consumes about 100 mA when playing an MP3 track. It must be battery powered, and space limitations means these need to be AA. As there is unfortunately no 5V battery generally available (I’ve never understood why?) I have to choose between alkaline and NiMh. Alkaline means regularly opening the case and are expensive. NiMh would be more convenient and economical. But both raise questions of whether to use three or four batteries, and if the latter whether to drop the voltage with one or two silicon diodes, or perhaps two or three germanium types if I can find any in my junk box. Or maybe just a zener and suitable resistor would be OK?
I’m guessing other hobbyists have had similar choices to make and I’d much appreciate any tips, suggestions, recommendations, etc please.
Terry
I’m guessing other hobbyists have had similar choices to make and I’d much appreciate any tips, suggestions, recommendations, etc please.
Terry