爱好者在电子制作中有时需要精确的秒信号发生电路。通常是采用专用或通用数字集成芯片组装而成。从经济和繁简程度上考虑,可采用石英钟(表)电路经改动制作秒信号发生器。笔者以DSH14型石英表采用的STP5490DIG集成电路为例介绍其改制方法。该集成电路工作原理图如图1所示。STP5490DIG由1.5V干电池供电,在其第③、④脚间接入32678Hz的石英晶体振荡器,经 Fans in electronic production sometimes need accurate second signal generation circuit. It is usually assembled using a proprietary or general purpose digital integrated chip. From the economic and complexity considerations, quartz clock (table) circuit can be modified to make the second signal generator. The author uses STP5490DIG integrated circuit which DSH14 type quartz watch adopts as an example to introduce its restructuring method. The integrated circuit schematic shown in Figure 1. STP5490DIG by 1.5V battery-powered, in the first ③, ④ feet access 32678Hz quartz crystal oscillator, the