scoreboard

/I scoreboard This scoreboard featured in this article is intended for use in quiz type competitions where competi- tors can both gain and lose points. Scoring can sometimes become quite "confused" in the heat of the moment therefore simple operation is essen- tial. In this design a point is awarded or deducted by the process of pushing one of two buttons — one push, one point. When for instance the scorer has already awarded points and the referee reverses decision the correction can be carried out the decision easily. The circuit of the scoreboard is shown in figure 1. The counter IC chosen is the well known 74192 decade counter. This has two clock inputs, one for counting up and the other for counting down. The count (or clock) pulses are created by either of the two flipflops formed by gates Ni, N2 or N3, N4 which are triggered by switch Si or S2, The two counters are connected in series to provide a maxi- mum count of 99. The 74192 presents the information at its output in ...