Project name: measuring amplifier The package contains the c source program (development environment for keil), the target code (which can be directly fired into the operation of the AT89S52 chip), the schematic diagram of the circuit, etc. The source program contains software modules: 4 by 4 matrix keyboard scan, led display, programmable signal attenuation. Hardware module: the structure of preamplifier with medical physiological signal detection instrument can amplify extremely weak signals, such as millivolt signal. Add programmable attenuators to this base. Implementation function: by pressing the key input of the weak signal amplification multiple, can amplify the weak signal accordingly. When setting multiples, there are four LED display multiples, press "thousand", "hundred", "ten", "one" order setting, and the place to be set will blink for setting. The magnification is 1 ~ 1000 times. For example, the weak voltage of 1mv can be amplified to 1v and the error is less than 0.3%. The chips used are at89s52, ADC7520, opa177,74ls245, 74ls138, etc. It's totally original.

原创 测量放大器的设计（内含单片机keilc源程序，电路原理图）
..........................................................\单片机源程序（keilC语言）.doc


..........................................................\目标代码（可直接烧入AT89S52单片机运行）.hex
..........................................................\项目说明.txt

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