What is the model of the chip?

LM324: A family of quad op-amps with true differential inputs, with true differential inputs. They have some significant advantages over standard op-amps in single-supply applications. The quad amplifier can operate from supplies as low as 3.0 volts or as high as 32 volts with a quiescent current that is one-fifth the quiescent current of the MC1741. The common-mode input range includes the negative supply, eliminating the need for external biasing components in many applications.

LM358: The LM358 is a dual operational amplifier. It includes two independent, high-gain, internal frequency-compensated operational amplifiers, suitable for single-supply use with a wide supply voltage range, and also for dual-supply operating modes. Under the recommended operating conditions, the supply current and supply voltage It doesn't matter. It is used in sense amplifiers, DC gain blocks, and all other applications where op-amps can be operated from a single supply.

TL082: The TL082 is a general-purpose J-FET dual operational amplifier. Its characteristics are: lower input bias voltage and offset current; output with short-circuit protection; input stage with higher input impedance; built-in frequency compensation circuit; higher slew rate.

TL074: It is an input operational amplifier with high voltage bipolar transistors in a monolithic integrated circuit. Check TI TL074CN example.

CA3140: High Input Impedance Operational Amplifier.

Pin 1 is the input offset voltage adjustment pin;

Pin 2 is the inverting input terminal,

Pin 3 is the non-inverting input terminal;

Pin 4 is the working negative power input pin,

Pin 5 is the input offset voltage adjustment pin;

Pin 6 is the output terminal,

Pin 7 is the working positive power input pin,

Pin 8 is the output of the second-stage amplification inside the CA3140 and is brought out as the 8th pin.

OP07: The Op07 chip is a low noise, non-chopping zero-stabilized bipolar (dual power supply) operational amplifier integrated circuit. Since the OP07 has a very low input offset voltage (25µV maximum for the OP07A), the OP07 does not require additional zeroing in many applications. The OP07 features both low input bias current (±2nA for OP07A) and high open-loop gain (300V/mV for OP07A). Amplify the weak signal of the sensor, etc.

OP27: The OP27 precision operational amplifier combines the low offset voltage and drifts characteristics of the OP07 with the high speed, low noise characteristics.

ICL7650: ICL7650 is a chopper-stabilized high-precision operational amplifier made by Intersil using dynamic zero-calibration technology and CMOS process. It has a small input bias current, small offset, high gain, strong common-mode rejection, fast response, and drift. Low, stable performance and low price, and so on.