No podemos oír Ultrassons, pero animales como los perros pueden y también podemos tener circuitos para su recepción. De esta forma, un pequeño transmisor de ultrasonido puede tener varias utilidades descritas a continuación.

Puede servir para llamar animales entrenados como, por ejemplo, perros y hasta ahuyentarlos como elemento de intimidación.

Puede servir para dar señales a un compañero que utilice un receptor apropiado. El tipo de onda utilizada no puede ser detectado por equipos comunes.

Se puede utilizar para accionar algún dispositivo de control remoto como, por ejemplo, apertura de puerta, una luz o incluso una pequeña bomba de unión para atraer la atención.

Comenzamos por describir el montaje de un generador ultrasónico simple y de buena potencia.

El transductor es un tweeter piezoeléctrico común que tiene un buen rendimiento en frecuencias de hasta 22 kHz. (recordamos que la gente sólo puede oír hasta aproximadamente 16 kHz).

En la figura 1 tenemos el diagrama completo del transmisor.

 

Figura 1 - Diagrama del transmisor
Figura 1 - Diagrama del transmisor

 

Para utilizarlo debemos inicialmente ajustar P1 para que la señal emitida esté un poco por encima de lo que podemos oír, o sea, suficientemente agudo para que nuestros oídos no lo perciban.

Intente entrenar a un perro para responder a esta señal: cada vez que le dé una golosina, apriete el botón de emisión. Usted verá que su perro le pasará a atender "por control remoto" cuando usted presione el botón, aunque esté lejos, pues él podrá oír el llamado ultrasónico.

 

SEMICONDUCTORES

Q1 - BC547 o equivalente - transistores NPN de uso general

Q2 - BC557 o equivalente - transistores PNP de uso general

 

RESISTORES

R1- 10 k - resistor (marrón, negro, naranja)

R2 - 1 k - resistor (marrón, negro, rojo)

P1 - 100 k - trimpot

 

CAPACITORES

C1 - 10 nF - capacitor de cerámica o poliéster

C2 - 100 uF - capacitor electrolítico

 

DIVERSOS

FTE - tweeter piezoeléctrico

B1 - 6 V - 4 pilas pequeñas

S1 - Interruptor de presión

Placa de circuito impreso, soporte de pilas, caja para montaje, hilos. soldadura, etc.

 

Receptor Ultrasónico

Un primer receptor simple para ultrasonidos y que convierte sus señales en tonos audibles se muestra a continuación. Este circuito divide por 10 la frecuencia de la señal captada de modo que se puede reproducir dentro de la pista que podemos oír en un pequeño altavoz.

Utilizando el transmisor anterior, podemos utilizar este circuito para transmitir en Morse (telegrafía) mensajes secretos en un trabajo de espionaje indetectable, ya que las personas no pueden oír la señal, y los receptores de radio no los captan.

En la figura 2 tenemos el diagrama completo del receptor.

 

Figura 2 - Diagrama del receptor
Figura 2 - Diagrama del receptor

 

El micrófono ultrasónico no es más que un tweeter piezoeléctrico del que hayamos sacado el pequeño transformador interno y se conecta directamente al cristal.

La sensibilidad se controla en el potenciómetro y en la salida del circuito tanto podemos conectar un pequeño altavoz como un auricular de baja impedancia.

Una aplicación interesante para este aparato y que puede ser usada en trabajos de detectives es que él puede detectar emisiones de ultrasonidos que ocurran por algún equipo secreto instalado en algún lugar. Las señales de hasta 30 kHz pueden ser detectadas ya que por encima de eso, el transductor pierde mucho su sensibilidad.

Para probar el aparato es sólo apuntarlo al transmisor de ultrasonidos que hemos descrito anteriormente. Al apretar el interruptor del transmisor, se ajusta la sensibilidad del receptor en P1 para que haya reproducción de un silbato.

El alcance depende de la eficiencia del transductor (tweeter) y la frecuencia ajustada.

 

SEMICONDUCTORES

CI-1 - 4017 - circuito integrado

Q1 y Q2 - BC547 - transistores NPN de uso general

 

RESISTORES

P1 - 100 k - potenciómetro

R1 - 1 M - resistor (marrón, negro, verde)

R2 - 22 k - resistor (rojo, rojo, naranja)

R3 - 100 k - resistor (marrón, negro, amarillo)

R4 - 1 k - resistor (marrón, negro, rojo)

 

CAPACITORES

C1 - 10 uF - capacitor electrolítico

C2 - 100 uF - capacitor electrolítico

 

DIVERSOS

MlC -Tweeter utilizado como micrófono - ver texto

FTE - altavoz o auricular de baja impedancia

S1 - Interruptor simple

B1 - 6 V - 4 pilas pequeñas

Placa de circuito impreso, soporte de pilas, caja para montaje, hilos, soldadura.

 

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