用超市瓶装水复刻知名水源水质
本文介绍了一种利用超市常见瓶装水进行勾兑，以复刻世界知名水源（如依云、圣培露等）矿物质含量的方法。通过分析不同瓶装水的矿物质成分表，按比例混合即可在家中模拟出接近目标水源的水质，适用于咖啡、茶饮或调酒等对水质有要求的场景。
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A hobbyist salvaged vacuum fluorescent display (VFD) tubes from an old calculator and built a custom clock. The project involved reverse-engineering the tube pinout, designing a multiplexed driver circuit with a MOSFET and microcontroller, and using a 32.768 kHz crystal for accurate timekeeping. The finished clock was mounted in a CNC-milled wooden enclosure.
The article describes building a voltmeter clock where the design focus was as much on the wooden enclosure and aesthetics as on the electronics, highlighting that circuit design can be as much about craftsmanship as engineering.