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You should replace the 9V battery with a 9V regulated power adapter (the unregulated ones are much cheaper and can spike their output up to 13 or 15 volts and fry your stuff. Ask me how I know!)
Here's a link to one on Jameco's site:
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_252786_-1
Try going to that link, then clicking on the link for the catalog page, there's a whole bunch of them for different voltages. I tend to get the "slimline" ones at the bottom of the page, since they don't take up so much space on the power strip.
Here's a link to one on Jameco's site:
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_252786_-1
Try going to that link, then clicking on the link for the catalog page, there's a whole bunch of them for different voltages. I tend to get the "slimline" ones at the bottom of the page, since they don't take up so much space on the power strip.
