Este proyecto tiene por base el ART111S en que se describe el funcionamiento del circuito integrado µAA170, una escala de punto móvil.

Este es el montaje más “refinado" que presentamos: como tiene cierta complejidad, exige una placa externa. Con el circuito propuesto obtenemos en la escala de LEDs una marcación de la rotación del motor, que puede ajustarse fácil mente entre 0 a 8000.RPM.

No será necesaria ninguna modificación en el sistema de ignición o parte eléctrica del auto, ya que apenas se hace la conexión de un alambre en el platino. Por otro lado, el efecto decorativo es tan interesante como importante la economía de combustible que se obtiene con los cambios de marcha en las rotaciones correctas.

Lo que hacemos es montar un captador de impulsos del platino, que son integrados a través de un monoestable, de tal modo que se obtiene en la salida una tensión proporcional al número de aberturas y cerramientos de este platino.

Es interesante observar que, con esta configuración integradora, la tensión de salida es independiente de la duración o intervalo de los pulsos, sino solamente depende de su cantidad, lo que corresponde justamente a la rotación del motor.

 

Montaje

En la figura 1 tenemos el diagrama de la interface que será conectada en la entrada del indicador de LEDs. (ART111S)

 

Figura 1
Figura 1

 

Es muy importante observar la presencia del filtro de entrada de 100 µH, que puede hacerse enrollando unas 100 a 150 espiras de alambre esmaltado 28 en una barra de ferrite.

Este filtro elimina las interferencias del propio sistema eléctrico del automóvil que pueden provocar el encendido errático de los LEDs.

En la figura 2 tenemos la placa de circuito impreso sugerida para este montaje.

 

Figura 2
Figura 2

 

Para evitar problemas de interferencia en su radio, es interesante que el alambre que va del platino al cuentavueltas sea blindado con una malla bien conectada a tierra (al chasis).

 

Prueba y Calibración

EI circuito propuesto original- mente fue proyectado para operar con motores de 4 cilindros con rotación de hasta 8000 RPM, pero para otros tipos también funciona, con modificaciones en la escala y en el procedimiento para calibración.

Para ajustar, conecte la unidad en una fuente de 12 V.

Gire el trimpot 555 en el sentido de obtener la máxima resistencia.

Conecte la entrada del circuito (R1) en una fuente de 5 a 15 V de CA, o sea, un transformador común de 5 a 15V (cualquier corriente) conectado a la red local, como muestra la figura 3.

 

Figura 3
Figura 3

 

Antes de accionar el transformador, ajuste el trimpot de limite inferior para que el LED correspondiente a 0 RPM se encienda.

Accionando el transformador, ajuste el trimpot el P1 del 555 para que el LED que corresponde a 1800 RPM (aproximadamente) encienda, Si no se alcanza este LED, no ajuste en este trimpot, actúe sobre el trimpot de límite superior.

Con esto, el tacómetro ya puede ser instalado en su automóvil.

 

CI-1 - 555 - circuito integrado

Q1 - BC 548 o equivalente - transistor NPN de uso general

Z1 - 5V4 x 400 mW- diodo zener

Z2 - 9V1 x 1W - diodo zener

D1, D2 - 1N4148 - diodo de uso general

P1 – 100 k – trimpot (Resistores de 1/8 W excepto R7 1 W)

R1 - 100k - resistor ( marrón, negro, amarillo)

R2 - 1k2 - marrón, rojo, rojo

R3 - 5k6 - verde, azul, rojo

R4 - 47k - amarillo, violeta, naranja

R5 - 15 k - marrón, verde, naranja

R6 - 4k7 - amarillo, violeta, rojo

R7 - 470 Ω - amarillo, violeta, marrón

R8 – 1 k - marrón, negro, rojo

R9 - 10 k- marrón, negro, naranja

R10 – 100 kc - marrón, negro, amarillo

C1 - 56 nF - capacitor cerámico

C2 - 47 nF - capacitor cerámico

C3 - 100 nF - capacitor cerámico

C4 - 100 nF - capacitor cerámico

C5 - 22 M -.- electrolítico para 15V o más

C6 - 2,2 µF - electrolítico para 15V o más

C7 - 220 nF - capacitor cerámico

C8 – 470 µF – electrolítico

C9 - 100 nF - capacitor cerámico

Varios: placa de circuito impreso, alambres, caja para montaje, soldadura, alambre blindado, etc.

 

(Publicado originalmente en 1987)

 

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