En los equipos electrónicos encontramos diversos tipos de llaves. Como en cualquier otro equipo, las llaves se utilizan para controlar la corriente en los circuitos o en sus partes. Las diferencias entre las llaves que encontramos en las instalaciones eléctricas y en los equipos electrónicos no son muchas. La mayor diferencia está en el hecho de que en muchos aparatos electrónicos ciertas llaves pueden controlar varias corrientes al mismo tiempo. En la figura 1 mostramos los símbolos adoptados para representar las llaves a los principales tipos. El símbolo indica lo que hace la llave.


 

 

 

 

Por ejemplo, en (a) tenemos una llave SPST (un polo una posición o Single-Pole Single Throw) que es un interruptor simple que controla una corriente en un solo circuito.

Una llave de dos polos x 2 posiciones (DPDT - Double-Pole Double-Throw) controla la corriente en dos circuitos al mismo tiempo pasando de uno a otro conductor (b).

Las llaves también se clasifican de acuerdo con la forma en que se operan pudiendo ser deslizantes o rotativas. Algunas llaves especiales también se pueden encontrar directamente montadas en las placas de circuito impreso para la configuración, siendo llamadas "dip switches". Las llaves se encuentran en todas las aplicaciones donde la cadena necesita ser controlada. Todo equipo necesita al menos una llave para su funcionamiento, la que conecta y apaga su alimentación.

Las principales especificaciones de las llaves son el número de polos, el número de oposiciones además de la corriente y la tensión máxima de operación. Los polos pueden ser indicados por símbolos como los que hemos visto:

SPST - Un polo x Una posición (Single-Pole Single-Throw)

SPDT - Un polo x Dos posiciones (Single-Pole Double-Throw)

DPDT - Dos polos x Dos posiciones (Double-Pole Double-Throw)

La corriente máxima de operación de una llave se indica en ampères (A). Nunca utilice en una aplicación una llave con menor capacidad que la recomendada. Los contactos pueden calentar dañándola. La tensión máxima de operación se indica en volts (V). Para una prueba ligera en consideración que:

Una llave abierta tiene que presentar una resistencia infinita y cuando está cerrada muy baja (cerca de cero). Para probar una llave basta con hacer una prueba de continuidad con ella abierta y luego cerrada. Para ello se puede utilizar un multímetro en la escala más baja de resistencias. Una prueba visual también ayuda, pues una llave que ha sufrido sobrecargas tiene señales de quemado y deformaciones.

 

 

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