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This is a circuit that explains on how to build a NPN or PNP transistor tester. This … | Esquemas electrónicos, Electricidad y electronica, Proyectos electronicos
How to check NPN transistors - YouTube
Simple Transistor Tester Circuit
Simple Transistor Tester Circuit for Bipolar Transistors
GenesisElectronics - FINDING THE BASE and determining NPN or PNP Get an unknown transistor and test it with a multimeter set to "x10" Try the 6 combinations and when you have the