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Identifying the correct leg of a transistor or MOSFET
How to sort out route overlapping problems in Eagle PCB
Easy DC Motor Controller
If you have a component tester, like that found on old oscilloscopes you can use that. Or if you have a multimeter with a transistor tester you use that until you see the correct beta or gain value on the display. Or you can use a adjustable DC voltage supply and observe the I-V curve.
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