En el circuito que hace uso de un PIC16F84, el audio presente en la entrada tendrá su nivel controlado por la tensión DC aplicada al pin 2 del MC3340P. El nivel de audio mostrado en la salida se puede cambiar entre cero y un valor en amplitud cuatro veces mayor que la señal aplicada a la entrada. Para lograr una tensión DC, que se aplicará al pin 2 del MC3340P, se utilizó un PIC16F84 que es el "cerebro: del circuito, un convertidor analógico-digital DAC0808 y un amplificador operacional LF353. El proceso de control es el siguiente: se presiona una de las teclas (S1 o S2), que incrementan o decrementan el contador de 8 bits del PIC, el valor del contador se transfiere al DAC0808 que lo convierte a la forma digital del PIC en una corriente equivalente. La potencia convertida se aplica a la clavija 2 del MC3340P. El potenciómetro P1 es el ajuste de escala del amplificador operacional que debe ajustarse, preferiblemente en 5,187 k. P2 es el control de amplitud. de 5 V simétricas y 12 V simples Para evitar la captación de zumbidos se deben utilizar cables blindados en las conexiones de salida y entrada del MC3340P El programa puede ser desarrollado por el montador y el circuito po de ser modificado con el aumento de más funciones para el PIC. El circuito es de 2003 y algunos componentes no son comunes actualmente.

 


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