Amplification filter integrated module

The project is divided into anti-reverse connection circuit, +5V voltage stabilizing circuit, +5V to -5V circuit, AD603 amplifier circuit, 20k high-pass filter, and 300k low-pass filter:

1. The +5V voltage stabilizing circuit uses AMS1117 -5.0 step-down chip, the input voltage VCC should be higher than 5V
2. The +5V to -5V circuit uses the MC34063ADR chip, and the maximum current is about 200mA
. 3. The amplifier circuit chip is the voltage-controlled amplifier chip AD603, and the gain is fixed at 40dB. Variable gain 4 can be achieved by changing the chip resistor to an adjustable resistor
. The high and low pass filters use AD8039 (two-way operational amplifier), or can be changed to other operational amplifiers (gain bandwidth product, power supply requirements allow), The filter circuits are all Sallen key structures (the first stage of the high-pass filter is an RC buffer).