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デジタルICで増幅

PaintBBS0221062106.pngなんか思い出した事。
7400などのデジタルICは、あくまで1か0の信号を扱うものであって、アナログ回路ではないのだが、これを増幅器に使うというアイデアが、昔の雑誌に載っていた。
理想的には、デジタルICの出力は図1のように矩形波になるのだが、実際は急角度で切れ上がる山形になっている(図2)。そこで、入力にその範囲の振幅のアナログ信号を入れてやれば、増幅された出力が得られるというわけ。
まあ、実用的にはオペアンプでも使ったほうがいいと思うが、面白いことを考える人がいたものだ。

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