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LM3940 regulator not putting out 3.3V - Physics Forums
Apr 10, 2008 · If so, there is something wrong with the LM3940, or you have the pinout wrong. Keep in mind that the pinout is different for some regulators when they are in different packages. The pinout for the 7805 regulator is different between the TO-92 package and the TO-220 package, for example.