利用51单片机，XPT2046内的ad功能和dac081的功能，实现agc的程控放大。程控芯片为AD603，内部参数根据电路不同进行计算(The use of 51 single-chip microcomputer, XPT2046 within the ad function and dac081 functions to achieve AGC program-controlled amplification. The progr