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Preamplificador mezclador de audio hecho en casa con sólo un transistor y componentes baratos.

This is a circuit that explains on how to build a NPN or PNP transistor tester. This is useful when building RF circuits and need to know if the transistor that you're going to use is bad or good.

Darlington transistor switch, npn, Darlington transistor, NPN transistors, pnp