I am hoping to try out the following circuit. Mainly because I'd like to add a milliohm meter to my equipment and because I already have the Digital Panel Meter. A kit I bought and built years ago based on the ICL7107 with 4 seven segment LED readout. The designer of the below circuit does not explain why "separate" batteries should be used. I would like to power the whole thing with just one 9v DC wall wart. Can this be done? Thanks.
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