ジャンクの真空蛍光表示管を使って時計を作る
古い電卓から取り出した真空蛍光表示管（VFD）を使い、ニキシー管のような外観のデジタル時計を自作したプロジェクト。電圧や電流の調整による表示管の動作条件の見極め、マイコン制御によるマルチプレクス駆動、32.768kHz水晶発振子を用いた高精度な計時など、電子工作の実践的なノウハウが詰まっている。最終的にはCNCで削り出した木製ケースに収め、見た目も完成度の高い作品に仕上げている。
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