Circuitos como este se pueden usar en diversos proyectos de instrumentación, pues convienen tensiones continuas en frecuencia de modo lineal en una amplia banda de valores. El VCO (oscilador controlado por tensión) que describimos opera en la banda de 100 Hz a 100 kHz y emplea un único integrado.

Este circuito fue desarrollado a partir de informaciones del manual del LM339 de Philips Components (1989) con pequeñas alteraciones en el circuito original de modo de adecuar los componentes a lo que hay disponible en nuestro mercado.

El LM339 que es la base del circuito, consiste en un cuádruple comparador de tensión. empleándose en este proyecto tres comparadores.

El circuito aparece en la figura 1.

 

Figura 1
Figura 1

 

La alimentación se hace con 30 V y en la entrada podemos aplicar tensiones en la entrada de 200 mVa 50 V para que la frecuencia de salida corra la banda de 100 Hz a 100 kHz.

El circuito produce dos tipos de señales: rectangulares y triangulares, lo que amplia aún más su gama de aplicaciones.

La simetría de la señal está dada por los resistores R5, R6, R9 y R10 que eventualmente deben ser componentes de precisión.

Como se trata de un circuito que debe formar parte de proyectos más complejos, el diseño de la placa será específico, dependiendo de la aplicación, por lo cual no lo daremos en este artículo.

Los resistores usados son todos de 1/8 ó 1/4 W, los capacitores pueden ser cerámicos o de poliéster, y el integrado, para mayor facilidad de cambio en caso de necesidad y también para evitar el recalentamiento durante el proceso de soldadura puede ser instalado en un zócalo de 14 pinos. La alimentación positiva del integrado se hace en el pin 3 y la negativa en el pin 12.

 


 

 

 

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