以往计算节目时间,通常采用秒表计时法,因而经常出现漏计或多计等毛病,给工作带来了许多不便。为此我们采用了以晶振为时钟的秒脉冲发生器,做为标准秒信号源,用 HTL电路做计时显示,附加延时显示电路,自制成了一台有数码显示的自动计时器。经长期使用证明,性能较好,放音与计时自动同步,克服了秒表计时法的某些不足,提高了计时的准确性和可靠性,基本上达到了设计要求。 In the past, program time was calculated and the stopwatch timekeeping method was usually adopted. As a result, there were frequent problems such as omission or multiple calculation, which brought many inconveniences to the work. To this end, we use the second pulse generator with crystal as the clock, as the standard second signal source, using the HTL circuit timing display, additional delay display circuit, self made a digital display automatic timer. After long-term use proved that the performance is better, playback and timing automatically synchronized to overcome some of the shortcomings of the stopwatch timing method to improve the timing accuracy and reliability, basically meet the design requirements.