ThanksThe TDA2005 is made by an Italian company. Their English datasheet is missing a lot of information. Maybe the details are on the Italian datasheet but I have never seen it and I do not know Italian.
This is the latest English datasheet (2012) I have found; is it the one you have?
I am currently using 6 AA batteries to achieve the 9V. I find that I can buy 6 AA batteries for $3.79 as compared to 1 9V battery for $3.15. If it turns out that AA batteries don't last long enough, I can go to C or D cells. And if 9V is insufficient, I can go to 8 or 10 cells.
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