Gran cantidad de aplicaciones modernas utilizan micrófonos de eletrecto.

Sin embargo, estas aplicaciones en su mayoría utilizan las alimentaciones de baja tensión, lo que requiere el empleo de circuitos especiales para la amplificación, no siempre disponibles en la línea convencional de componentes.

El circuito mostrado en la figura 1, sugerido por la ST Micro (www.st.com) se destina a esas aplicaciones en las que la alimentación se realiza con una tensión muy baja (2,7 V) y que aún existen problemas de interferencia de los propios equipos .

 

 


| Haga click en la imagen para ampliar |

 

 

La base del circuito es un integrado de la familia TS97x que se caracteriza por tener características de audio excelentes como una distorsión armónica total (THD) de apenas 0,003% a una frecuencia de 1 kHz y un ruido de entrada equivalente de sólo 4 nv /sqrt (Hz ).

La fidelidad obtenida cuando estos componentes se utilizan dado su ganancia-rango pasante de 12 MHz.

Los componentes que se pueden utilizar en este proyecto son el TS971 en envoltorio SOT23-5 y el TS972 / 4 que viene en la envoltura TSSOP.

Se observa en el circuito la existencia de un filtro contra EMI que es indicado en aplicaciones, como teléfonos celulares y transceptores, en el cual una alta frecuencia generada en el propio circuito puede causar problemas de interferencia.

Este filtro tiene una frecuencia de corte de 33,8 MHz que es un valor ideal para los niveles y valores encontrados en equipos como teléfonos celulares y otros.

Evidentemente, el proyectista que utilice este circuito debe estar atento para el diseño de la placa para que sendas largas no actúen como antenas captando interferencias por otros puntos.

 

 

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