Esta versión de biofeedback utiliza transistores unijuntura, pero puede ser implementada con facilidad para los que gustan del tema de esta sección. En este circuito, la presión de los dedos y la concentración controlan los intermitentes de un LED. El circuito es alimentado por pilas o batería y muy fácil de montar.

   Describimos un oscilador que es controlado por la resistencia de la piel y la presión sobre un electrodo.

   Concentrándose para mantener constante el parpadeo de los LEDs, la persona puede conseguir una condición de relajación.

   Los electrodos consisten en dos planchas de metal o incluso dos pilas gastadas que deben ser seguras con la presión controlada.

 

   Como funciona

   Un transistor unijuntura funciona como oscilador de relajación teniendo la frecuencia determinada por C1 y por el ajuste de la polarización por P1, además de la resistencia entre los electrodos.

   La señal de este circuito se aplica a un transistor amplificador que excita un LED.

   De esta forma, los intermitentes del LED depender del grado de presión de las manos o dedos sobre el electrodo.

 

   Montaje

 En la figura 1 damos el diagrama completo del aparato.

 

   Figura 1 - Diagrama completo
   Figura 1 - Diagrama completo

 

 

   Una primera opción de montaje, más simple y menos crítica, es la que hace uso de un puente de terminales, mostrado en la figura 2.

 

Figura 2 - Montaje en puente de terminales
Figura 2 - Montaje en puente de terminales

 

 

   Sin embargo, un montaje mejor se puede hacer en una placa universal o matriz de contacto con la disposición de componentes mostrada en la figura 3.

 

Figura 3 - Montaje en matriz
Figura 3 - Montaje en matriz

 

 

   En el montaje, tenga cuidado con la posición de los transistores y la polaridad del LED.

   Los resistores son de 1/8 W y los condensadores electrolíticos para 12 V o más.

   En la figura 4 tenemos una sugerencia de caja para montaje, mostrando los electrodos hechos con pilas gastadas.

 

   Figura 4 - Sugerencia de montaje
   Figura 4 - Sugerencia de montaje

 

 

   Las pilas deben tener la pintura raspada para mejorar el contacto con las manos.

   Asegúrese de no utilizar pilas muy gastadas que ya den señales de fugas.

   Para usar, ajuste P1 para el ritmo deseado de los intermitentes y luego vea la acción de su mano o dedos sobre los electrodos.

 

Lista de materiales

Q1, Q2 - BC548 - transistores NPN de uso general

Q1 - 2N2646 - transistores unijunturaLED - LED común de cualquier color

S1 - Interruptor simple

B1 - 6 o 9 V - pilas o batería

X1, X2 - electrodos - ver texto

P1 - 4M7 - potenciómetro

R1 - 100 k ohms - resistor - marrón, negro, amarillo

R2 - 10 k ohms - resistor - marrón, negro, naranja

R3 - 470 ohms - resistor - amarillo, violeta

R4 - 560 ohms - resistor - verde, azul, marrón

C1 - 2,2 uF - electrolítico

C2 - 100 uF - electrolítico

Varios:

Puente de terminales o matriz de contactos, soporte de pilas o conector de batería, caja para montaje, hilos, soldadura, etc.

 

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