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In a STM, a tip is scanned on top of a surface with a separation of a few \u00c5. Often, the tunneling current between the tip and the sample is maintained constant by modifying the distance between the tip apex and the surface through a feedback mechanism acting on a piezoelectric transducer. This produces very detailed images of the electronic properties of the surface. The feedback mechanism is nearly always made using a digital processing circuit separate from the user computer. Here, we discuss another approach using a computer and data acquisition through the universal serial bus port. We find that it allows successful ultralow noise studies of surfaces at cryogenic temperatures. We show results on different compounds including a type II Weyl semimetal (WTe2), a quasi-two-dimensional dichalcogenide superconductor (2H\u2013NbSe2), a magnetic Weyl semimetal (Co3Sn2S2), and an iron pnictide superconductor (FeSe).<\/jats:p>","DOI":"10.1063\/5.0064511","type":"journal-article","created":{"date-parts":[[2021,10,11]],"date-time":"2021-10-11T06:01:52Z","timestamp":1633932112000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":20,"title":["Simplified feedback control system for scanning tunneling microscopy"],"prefix":"10.1063","volume":"92","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3317-7833","authenticated-orcid":false,"given":"Francisco","family":"Mart\u00edn-Vega","sequence":"first","affiliation":[{"name":"Laboratorio de Bajas Temperaturas y Altos Campos Magn\u00e9ticos, Unidad Asociada (UAM\/CSIC), Departamento de F\u00edsica de la Materia Condensada, Instituto Nicol\u00e1s Cabrera and 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B"},{"key":"2023080306493540900_c30","unstructured":"See https:\/\/osf.io\/by4aj\/ for schematics of the electronics."},{"key":"2023080306493540900_c31","unstructured":"See https:\/\/github.com\/LowTemperaturesUAM\/MyScanner for the code of the software."},{"key":"2023080306493540900_c32","unstructured":"We use Threaded Timer v.1.24, https:\/\/torry.net\/pages.php?id=294."},{"key":"2023080306493540900_c33","unstructured":"N.\u2008Korver, \u201cAdequacy of the universal serial bus for real-time systems,\u201d 2003, https:\/\/core.ac.uk\/download\/pdf\/11461022.pdf."},{"key":"2023080306493540900_c34","volume-title":"Soft Real-Time Systems","year":"2005"},{"key":"2023080306493540900_c35","year":"2019"},{"key":"2023080306493540900_c36","unstructured":"J.\u2008Moscatello, https:\/\/la.mathworks.com\/matlabcentral\/fileexchange\/62629-stsplot-yplot-yoffset-repetitionnumber-varargin."},{"key":"2023080306493540900_c37","doi-asserted-by":"publisher","first-page":"347","DOI":"10.1038\/nature09169","article-title":"Intra-unit-cell electronic nematicity of the high-Tc copper-oxide pseudogap states","volume":"466","year":"2010","journal-title":"Nature"},{"key":"2023080306493540900_c38","doi-asserted-by":"publisher","first-page":"353","DOI":"10.1103\/revmodphys.79.353","article-title":"Scanning tunneling spectroscopy of high-temperature superconductors","volume":"79","year":"2007","journal-title":"Rev. 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