IgorT
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That is what i wanted to do at first as well. You can boost the voltage to 10V (no load voltage) and then, when you pull some current this will drop, as the battery drops, it will drop even more, so you need to boost to more than the minimum needed.
In the end, the efficiency will not be very good, but it could work from a single AA cell. The 317 has around 30-40% efficiency,and the boost circuit can be 80-90% if it's good, so the combined will be low. But since you're only driving a Blu Ray at under 100mA most likely, it will work for a while. The current draw on the AA cell will be close to 1A tho.
The numbers are just a quick guess, and they depend on what you actually use and how good you adjust it. I would adjust it so, that the boost circuit would still provide enough voltage for the 317 to regulate, even when the battery is close to empty.
In the end, the efficiency will not be very good, but it could work from a single AA cell. The 317 has around 30-40% efficiency,and the boost circuit can be 80-90% if it's good, so the combined will be low. But since you're only driving a Blu Ray at under 100mA most likely, it will work for a while. The current draw on the AA cell will be close to 1A tho.
The numbers are just a quick guess, and they depend on what you actually use and how good you adjust it. I would adjust it so, that the boost circuit would still provide enough voltage for the 317 to regulate, even when the battery is close to empty.