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Ayuda electronicos: esquema temporizador - .:SoloVag:.

Ayuda electronicos: esquema temporizador

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Racing_Enriquez
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Ayuda electronicos: esquema temporizador

Mensajepor Racing_Enriquez » Dom Jun 28, 2009 6:45 pm

Buenas compañeros

Necesitaria ayuda de alguien que sepa de electronica

Me haria falta saber que necesito para hacer un temporizador que tenga 10/15 segundos de duracion (a 12 voltios tanto de entrada como de salida)

Gracias

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madelgado
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Re: Ayuda electronicos: esquema temporizador

Mensajepor madelgado » Dom Jun 28, 2009 9:26 pm

Está chupao... hay un circuito para temporizar super-extendido, que está basado en el integrado 555. Se alimenta con cualquier cosa hasta 30 voltios, y como salida te da lo mismo que a la entrada... A él puedes conectarle algo que no tenga un gran consumo... es decir, directamente puedes conectar leds, micro-relés, e incluso un relé de los de tipo automoción (de los modernitos que consuman menos de 0,050 A (50 miliamperios). Si necesitas consumos mayores (bombillas, etc) entonces eso lo conectas a través del relé. Necesitas un "disparo"; el 555 se dispara por un pulso "bajo",es decir, una señal que esté en reposo a 12 voltios y que en el momento de disparar el temporizador, baje a masa y luego vuelva a subir... Si lo que tienes es una señal contraria, entonces has de invertirla con un transistor NPN, con una resistencia de 10K en la base.

Si detallas un poco tus necesidades, quizás podamos echarte una mano más precisa. Saludos.
Passat 1.9 TDI 100 (AVB) Tiptronic (homologado)

--- VOLVIENDO DE VACACIONES... CON JET-LAG ---

Racing_Enriquez
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Re: Ayuda electronicos: esquema temporizador

Mensajepor Racing_Enriquez » Dom Jun 28, 2009 10:50 pm

Veras madelgado es para lo siguiente

Al coche le voy a poner 2 camaras de aparcamiento, una delantera y otra trasera

La pantalla k tengo solo tiene una entrada de video

Mediante un rele de doble circuito hare la conmutacion entre la camara delantera y la trasera

La pantalla cambia a modo parking cuando recibe una señal


La señal la tomare del positivo de la marcha atras, pero claro, en el momento en el k meta primera (llevara un pulsador o fin de carrera en la propia palanca para activar la camara delantera), la señal de marcha atras se perderia

Entonces para eso necesito que el temporizador me de unos 10/15 segundos y que alimente el cable de señal de la pantalla (para que pueda ver tambien la camara delantera)

No se si me explico bien

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madelgado
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Re: Ayuda electronicos: esquema temporizador

Mensajepor madelgado » Lun Jun 29, 2009 12:08 am

Entiendo... pero se puede simplificar la cosa sin tener que poner micro en la primera velocidad... ya que bastaría con que la cámara delantera se activase al "sacar" la marcha atrás (no?)... El tema es generar un pulso negativo al desengranar la marcha atrás, es decir, cuando el cable de marcha atrás deja de tener positivo... he hecho cosas parecidas pero tengo que darle unas vueltas... a ver si mañana se me ocurre el circuitillo...
Passat 1.9 TDI 100 (AVB) Tiptronic (homologado)

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Racing_Enriquez
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Re: Ayuda electronicos: esquema temporizador

Mensajepor Racing_Enriquez » Lun Jun 29, 2009 1:08 am

Ok, sin problemas

Tambien se podria hacer lo de la primera con un rele ahora que caigo


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