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本文所示的是插入ＰＣ并行口的一个８位计算机控制的模／数变换器。最大输入电压是５０Ｖｄｃ。电路用七个元器件（包括印制板），而成本低于２０美元。电路完全由一个短的ＢＡ－ＳＩＣ程序控制。一个２８６１０ＭＨｚ计算机可得到每秒２个取样，包括显示数值和更新图表。电路?
This article shows an 8-bit computer-controlled A / D converter plugged into a PC parallel port. The maximum input voltage is 50Vdc. The circuit uses seven components (including printed circuit boards) at a cost of less than $ 20. The circuit is completely controlled by a short BA-SIC program. A 28610MHz computer can get 2 samples per second, including display values and update charts. Circuit?