题目名称：数控电压源（题）摘要：本系统以直流电压源为核心，STC89C52单片机为主控制器，通过键盘来设置直流电源的输出电压，设置步进等级达0.5V，输出电压范围为0-15V，并可由液晶屏显示实际输出电压值。本系统由单片机程控输出数字信号，经过D/A转换器（DAC0832）输出模拟量，经过电流/电压转换（OP07)转换为电压，再经过运算放大器（LM328）输出不同的电压。实验测试结果表明本系统实际应用于需要高稳定度小功率恒压源的领域。关键词：STC89C52DAC0832OP07LM358液晶Abstract:Theaudiosignalanalyzerisbasedona32-bitMCUcontroller,throughtheADconverterforaudiosignalsampling,thecontinuoussignaldiscrete,andthenthroughtheFFTfastFouriertransformcomputing,inthetimedomainandfrequencydomainofthevariousaudiofrequencysignalweightandpower,andotherindicatorsforanalysisandprocessing,andthenthroughthehigh-resolutionLCDdisplaysignalsinthespectrum.Thesystemcanaccuratelymeasuretheaudiosignalfrequencyrangeof20Hz-10KHz,therangeof5-5VppmVpp,resolutionof20Hzand100Hzcorrespondent.Powermeasurementaccuracyupto1%,andbeabletoaccuratelymeasuringtheperiodicsignalcycleistheidealaudiosignalanalyzersolution.Keyword:FFTMCUSpectrumPowerTOC\o"1-3"\h\z\uHYPERLINK\l"_Toc113951468"1方案论证与比较PAGEREF_Toc113951468\h3HYPERLINK\l"_Toc113951469"1.1采样方法方案论证PAGEREF_Toc113951469\h3HYPERLINK\l"_Toc113951470"1.2处理器的选择方案论证PAGEREF_Toc113951470\h3HYPERLINK\l"_Toc113951471"1.3周期性判别与测量方法方案论证PAGEREF_Toc113951471\h3HYPERLINK\l"_Toc113951474"2系统设计PAGEREF_Toc113951474\h4HYPERLINK\l"_Toc113951475"2.1总体设计PAGEREF_Toc113951475\h4HYPERLINK\l"_Toc113951476"2.2单元电路设计5HYPERLINK\l"_Toc113951477"2.2.1前级阻抗匹配和放大电路设计5HYPERLINK\l"_Toc113951478"2.2.2AD转换及控制模块电路设计6HYPERLINK\l"_Toc113951479"2.2.3功率谱测量单元电路设计6HYPERLINK\l"_Toc113951481"3软件设计7HYPERLINK\l"_Toc113951482"4系统测试8HYPERLINK\l"_Toc113951483"5结论9HYPERLINK\l"_Toc113951484"参考文献：9HYPERLINK\l"_Toc113951485"附录：9HYPERLINK\l"_Toc113951486"附1：元器件明细表：9HYPERLINK\l"_Toc113951487"附2：仪器设备清单9HYPERLINK\l"_Toc113951488"附3：电路图图纸10HYPERLINK\l"_Toc113951489"附4：程序清单111.前言数控直流电压源是电子技术常用的设备之一，广泛的应用于教学、科研等领域。传统地多功能数控直流电压源功能简单、难控制、可靠性低、干扰大、精度低且体积大、复杂度高。普通数控直流电