Thank you. It's tough to get good info from the DIY audio community as it is filled with self-proclaimed audiophiles that tell you the switching frequency introduces unwanted harmonics or nonlinearities that they can somehow hear... despite being unable to tell you exactly what the mechanism IS that introduces the distortion.
anyways, I appreciate it. I am hoping to extend battery life this way instead of using two 9v batteries, which are both bulky and expensive to keep rebuying. hopefully a single lithium battery can make it smaller, lighter, and have a longer battery life.