La gran sensibilidad de este tipo de SCR recomendado en nuestros montajes permite que su disparo sea hecho por sensores de baja corriente tales como los LDR. Así, tenemos dos posibilidades del LDR para controlar el disparo del SCR al ser cortado un foco de luz que incide sobre su superficie sensible, o bien de ser disparado cuando la luz se centra en su superficie sensible. En la figura tenemos entonces el circuito en que utilizamos una fuente de alimentación de 6 a 12 V y un relé que puede controlar una carga de mayor potencia. El LDR se conecta entre el cátodo y la compuesta al SCR de modo que al tener luz incidente en su superficie, su baja resistencia sirva de cortocircuito para la tensión de disparo. Al cortar la luz la elevación de la resistencia hará que la corriente pase a circular por la conducción del SCR disparándolo. El potenciómetro sirve de ajuste de sensibilidad.

 


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Templatecassiopeia
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