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Neste vigésimo nono desta série de grande sucesso com mais uma seleção de circuitos que utilizam LEDs e Displays. Na verdade como temos uma enorme quantidade de circuitos em nosso estoque, mis mais de 9 000 deles e a cada dia este estoque aumenta, já fizemos 2 volumes anteriores com LEDs e Displays, mas temos muito mais. Muitos dos circuitos apresentados podem ser ados de forma dispersa no site do autor e também em outros livros. A vantagem de se ter estes circuitos organizados em volumes, além do o em qualquer parte, está na fácil localização de um circuito de determinado tipo. Teremos ainda artigos complementares de utilidade, relacionados com os temas abordados. A maioria destes circuitos, colhidos em publicações que, em alguns casos, podem não ser muito atuais, recebe um tratamento especial com comentários, sugestões e atualizações que viabilizam sua execução mesmo em nossos dias. Enfim, com esta série, damos aos leitores a oportunidade de ter em seus tablets, Iphones, Ipads, PCs, notebooks e outras mídias uma fonte de consulta de grande importância tanto para seu trabalho, como para seus estudos ou simples como hobby. Os 100 circuitos selecionados para esta edição da série são apenas uma pequena amostra do que você vai encontrar no site e nos outros volumes. Para esta edição escolhemos mais uma remessa com 100 circuitos que fazem uso de LEDs e Displays como efeitos de luz, alarmes, indicadores, provadores de componentes, links ópticos, monitores e muito mais. Estes circuitos, na maioria dos casos, podem ser montados com facilidade, pois usam componentes que ainda são comuns no mercado e de baixo custo.