LOGIC POWER SUPPLY
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You can use either some batteries (accumulators would be better, because they will not live enough time). In the picture I used four 9 V batteries because they were almost empty, but three connected in serie are enough (you have to use the 12 V regulator (LM7812) of course
......or buy a AC/DC source for 12 VDC. Because it is located under the table, the RF interference will be minimum, I had not experienced problems with it.