摘要：在其最简单的形式， 4通道10位A / D转换器（IC2）的几个被动元件，通过25针D型连接器连接到PC的打印机端口， PC的电压表组成。 Maxim > App Notes > A/D and D/A Conversion/Sampling Circuits Amplifier and Comparator Circuits Keywords: low powered op amps, quad op amps, rail-to-rail inputs, rail-to-rail outputs, rail-to-rail op amps, opamp Apr 10, 2003 APPLICATION NOTE 1988 Circuit Enables PC-Based Voltage Measurements Abstract:In its simplest form, the PC voltmeter consists of a 4-channel, 10-bit A/D converter (IC2) with a few passive components, connected to the PC printer port via a 25-pin male D-type connector. In its simplest form, the PC voltmeter of Figure 1 consists of section "A" alone: a 4-channel, 10-bit A/D converter (IC2) with a few passive components, connected to the PC printer port via a 25-pin male D-type connector. Power is derived from pins 2 and 3, and the cir……