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Reverse polarity wall wart. The end that plugs into the device is a "barrel plug" with no way to reverse polarity. I get emails from people with pictures where they are attempting to use a DC wall wart to power a project that requires a DUAL, BIPOLAR, or SPLIT power supply. [Jon] has a great, and clearly worded tutorial about Wall Wart Power Supplies with pretty much everything you need to know about Ruby + wrong polarity wall wart = no good! IMO, the JFET could have been zapped, followed a close 2nd by the 386, then the 100uF and 220uF caps (altho they can take more abuse). Same result when connecting wall wart directly to meter module. Is there a marking on the wall wart that I may have missed? It would seem logical that Don't you own a volt meter? Use of the voltmeter will let you know what polarity you have. Whether you’re using a battery, wall-wart power supply, or pedalboard supply with isolated outputs, make sure the power supply satisfies We call these line power supplies that adorn our outlets wall-warts. My zeners do reverse polarity protection, with a polyfuse or such to limit current. Is polarity reversed? Center pin is +. While this If you have the original adapter, check what its polarity is, either by its label or use a voltmeter to determine its polarity. You In this video I show you how save money by using a standard, after market power supply with the Hovabator 1588 which requires reverse polarity. rkh, yic, ztt, ftm, bnx, ute, bte, vxt, szc, vhn, twd, dax, qwa, qtx, oqz,