Contadores eletrônicos no laboratório didático. Parte I. Montagem e aplicações

Abstract

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 automatically a counting is also discussed. The described circuits are simple and they can be reproduced without great difficulty, even for undergraduate students. Copyright by the Sociedade Brasileira de Física.