This is the circuit diagram of the differential input amplifier
The IC1A is the simpel circuit of the differential amplifier.
The differential input amplifier is implemented for 3 reasons:
- High input impedance
- Protection of the ESP32 ADC por
- Setting the correct dc level for ESP32 ADC port
The IC1B sets the dc level to 1.65V (half supply voltage for the ESP32 - analog port. The small TO92 power regulator is for 3V3 for the op-amp and for the 2 resistors at pin 5 of IC1B. DC level is 1.65V.
The specification for the input amplifier:
The printed circuit board:
The assambled board
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