Transistor como interruptor de trabajo (NPN) Para proteger el transistor es necesario un diodo con una bobina de relé en paralelo en conexión inversa.... | By TecTupiza | Facebook
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transistors - Does a BJT controlled relay need protection diodes? - Electrical Engineering Stack Exchange
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How to Use Transistor as Relay | NPN Transistor as DC Switch | Best Relay Alternate for Arduino - YouTube
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