毕业设计---数字电压表

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1、毕业设计（论文） I 摘要摘要 家用电器和其他各类电子设备中，通常都需要电压稳定的直流电源供 电。但在实际生活中，都是由 220V 的交流电网供电。这就需要一个将交流 电转能够换成稳定性好，读数准确，使用简单的直流电源。本文主要介绍一 种简单且实用的数显式可调稳压电源，此电源电路是由电源变压器、整流电 路、滤波器、稳压电路以及数字显示电路组成。将电网电压先经过电源变压 器，然后将变换以后的副边电压再送去整流电路，将正负交替的正弦交流电 压整流成为单向的脉动电压；再通过滤波器，滤去整流输出电压中的纹波， 使输出成为比较平滑的直流电压，最后送给稳压电路。该电路稳定性好，读 数准确，使用简单，使用于

2、家庭和试验室使用。 关键词 直流稳压电源；电压调整；运放 TL081 毕业设计（论文） II Abstract Household appliances and other types of electronic equipment, usually require a stable voltage DC power supply. However, in real life, by the exchange of 220 V power supply. This will be a need to be replaced by AC stable, accurate readings, th

3、e use of simple DC power supply. This paper presents a simple and practical several explicit adjustable power supply, the power supply circuits from the power supply transformer, rectifier circuits, filter, voltage regulator circuit, as well as figures show circuit. Will be the first power grid volt

4、age power transformer, and then transform the future again sent Vice-voltage rectifier circuit, will be positive and negative turn of the sinusoidal AC voltage rectifier ripple voltage become a one-way, and through the filter, the filtered output voltage of the rectifier profiling wave, the output of a relatively smooth DC voltage, the regulator gave the final circuit.The circuit is stable, accurate readings, easy to use, the use of the family and laboratory use. Keyword DC power sup