terça-feira, 10 de julho de 2012

1 LED direto na tomada. (Pedido do leitor)

Pedido:


 " gostaria de um circuito aonde posso ligar um led 1w 350ma direto em127vac
algo simples porem eficiente
agradeço",  de LucasVidaFotografia.

Bom meu caro Lucas, a maioria dos LEDs , senão todos, operam com correntes menores que 350mA ( Acabo de descobrir um LED muito forte que opera à 350mA LINK ). Geralmente estes de 5mm operam entre 10mA à 30mA. Quanto maior a corrente, maior o brilho e menor será a vida útil.

Bem, se você quer apenas um LED, você deverá eliminar toda a tensão restante. Logo se o seu LED consumir 2,2 V, no caso dos de alto brilho, você deverá consumir com um resistor os 124,8 V que sobrarem.

R = V/i
R = 124,8/0,015  (0,015 foi um valor que eu escolhi de 15mA)
R = 8 320 Ohms

Agora que você sabe qual o resistência terá este resistor, você deverá saber qual será a potência para que você compre o resistor adequado.

P = Ri² 
P = 8 320 x (0,015)²
P = 1 872 W

Logo você deverá comprar um resistor de aproximadamente 8 320 Ohms e de aproximadamente 1,872 W. Eu acredito que o valor mais próximo comercializado é de 2 W. Mas se você preferir pode comprar dois resistores de 4 160 Ohms e 1W cada.

Bom, o circuito é o mesmo que está na outra postagem (Click aqui ), porem com estas mudanças do resistor. A ponte retificadora deverá ser mantida. Você pode fazer como está no esquema ou comprar o CI pronto.

Espero ter ajudado e que surjam mais perguntas e pedidos.


Agradeço a participação de vocês.


by: Fabrício José Mendes de Jesus



65 comentários:

LucasVidaFotografia disse...

Comprei um led de 1w 350ma conforme o link do post e liguei numa bateria de nokia celular e o bichinho é forte viu.

só tem um porem! Bebe a bateria rapidinho e da uma leve aquecida no led neste periodo LIGADO NA BASE ESTRELA E NO DISSIPADOR QUE FIZ.

A MINHA INTENÇÃO AGORA É MONTAR UMA FONTE SIMPLES SEM TRANSFORMADOR PARA LIGAR ESTE LED DIRETO EM AC.

Já tentou adquirir este led...Fabricio?

se eu ligar um destes no teto em cada comodo de minha casa (com circuito ac/dc espefico sem transformador. praticamente ilumino a casa toda com certa claridade a 7w... dai da para saber quantos comodos tem a casa. rs.

interessante seria tambem ligar numa bateria de carro (maior corrente em caso de falta de energia, usando uma chave para cada led em cada comodo...

http://produto.mercadolivre.com.br/MLB-431490079-led-1w-branco-quente-_JM

Fabrício disse...

Desculpa a demora para responder.
Não, ainda não adquiri este LED, mas sei o motivo da bateria acabar logo. Acontece que a bateria disponibiliza uma certa corrente por hora, e com certeza a corrente está um pouco alta, o que explica o calor.
Aplique a Lei de Ohm fazendo com que a corrente seja exatamente 350mA.

Quando eu estiver no PC explico melhor.

Abraço.

Unknown disse...

Bom dia amigo. Estou querendo montar u abajur de led, ligado num carregador de celular 5V 500mA (direto na tomada 127V), peguei vários cálculos e não consigo achar o valor do resistor. Me ajuda aí.Valeu.Meu nome é Celso , sou de Franca, SP.e-mail meiryecelso@yahoo.com.br. Um abraço e obrigado.

Eliseu Antonio Virag disse...

ligue 1 resistor de 27k no lado positivo do led e no lado negativo do led ligue 1 diodo 1n4007 ,pronto ai é so ligar no 110 ou 220 vlts que funciona. o lado negativo do led tem um corte na base.um abraço.

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