Article

Electronic counter in undergraduate laboratories: Part I. Assembly and applications

Revista Brasileira de Ensino de Física (Impact Factor: 0.1). 12/2009; 31(4):4901-4901. DOI: 10.1590/S1806-11172009000400021

ABSTRACT Mostramos, inicialmente, como montar um contador eletronico digital de 4 d´ igitos, utilizando componentes de baixo custo e facilmente encontrados no comercio especializado. Em seguida, mostramos, tambem, como um contador em associacao com um cristal oscilador de 1 MHz pode ser utilizado para medir com precisao intervalos de tempo na faixa de microssegundos, decimos de milissegundos e milissegundos. Exemplos de aplicacoes en- volvendo, particularmente, medida de frequencia, velocidade e aceleracao, assim como tecnicas eletronicas para iniciar/interromper automaticamente uma contagem sao tambem discutidos. Os circuitos descritos sao simples e podem ser reproduzidos sem grande dificuldade atem esmo por alunos de graduacao. Palavras-chave: contador eletronico, contador de decada, osciladora cristal, medidor de tempo, medida de intervalo de tempo. We show how to set up a 4-digit electronic counter, using inexpensive and easy-to-find components. We show, also, how a counter in conjunction with a crystal oscillator of 1 MHz can be used to measure time intervals accurately in the microsecond, 0.1 of millisecond, and millisecond range. Examples of applications involving, particularly, frequency, speed, and acceleration measurement, as well as electronic techniques for start/stop au- tomatically a counting is also discussed. The described circuits are simple and they can be reproduced without great difficulty, even for undergraduate students.

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