Like I said earlier in this thread, "Most products that are powered from a battery and an AC adapter use a jack with a built-in switch to disconnect the battery when the adapter is plugged in." The switched jack makes it automatic. You can make the AC adapter a battery charger if you want.Audioguru, how does the AC adapter magically route power away from the batteries? If I wire the adapter parallel to the batteries, won't some current be routed through the batteries, dangerously? I will remind you that I have not constructed this yet. It is not a prebuilt stereo that automatically switches between batteries and adapter. I need help making a circuit that will switch between batteries and a DC adapter. Or, I suppose, I could just make a manual switch so I can use either. But automatic would be much neater.
We were talking about Energizer Ni-MH rechargeable D zize cells that have a little AA cell inside. I don't think Duracell sells C and D Ni-MH cells.Also, I have no idea what you guys are talking about fake "D" cells for... I buy Duracell D's and they are extremely heavy for their size. They are no doubt different from C cells. I have measured the cells with a multimeter and they do output at different current levels. I do not know about other brands, however. Can anyone help me make this thing?
For your little amplifier you need six AA Ni-MH rechargeable cells and a charger for them.