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The most important factor for the efficiency is the load, so taking as little current as possible its important. In the datasheet I did not see any graph showing this caps vs efficiency. I used 10uF because are the ones recommended in the datasheet. You can try increasing the values or putting some in parallel and check if the efficiency improves.Basically, it says if you use 100uF caps, you can obtain 100% efficiency. So my question is, would using 100uF caps in this design have any negative effect on the pedal?
Yes, using chips in parallel will improve the efficiency a lot because also the load would be shared and that is the most important factor in efficiency. However the efficiency by "default" is over 70% which is pretty good. And no, I dont think that the sound would be affected in any negative way.So running these chips in parallel will lower the output impedance. This, of course is mostly for academic curiosity, and i realize that a serious modification to the final pc board would be the result if it worked, but is this actually going to affect my overall sound when completed?
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