Design and application of controllable amplifier

According to the design requirements that the design of the amplifier gain can be set up,low-pass filter,high-pass filter,band-pass filter of the band,the cut-off frequency,and other parameters can be set up,the different chips of various functions were effectiuely used——the use of single-chip 2(AT89C51) as the core of the control,use of part of the amplifier chip INA217,INA217 by the input signal amplification——making circuit magnification precision and easy to control,high anti-jamming ability,ard wide adjustment range.The display and key part use a human-computer interface constituted by real-time liquid crystal display and touch-screen set,which makes,the operation more convenient.