Pressure sensor circuit
The pressure sensor circuit is designed to accurately measure pressure changes and convert them into an electrical signal. The core component, the pressure sensor, operates at a nominal resistance of 120 ohms, which is typical for many pressure sensing applications. This resistance value is crucial for the circuit's calibration and sensitivity.
The amplification stage employs the AD521 operational amplifier, which is configured for a gain of 100. This high gain is essential for ensuring that small changes in the sensor's output voltage, caused by variations in pressure, are sufficiently amplified for further processing. The resistors Rs and Rc are used to set the gain and establish the feedback network necessary for stable operation of the op-amp.
Incorporating an A/D converter, specifically the ICL7107, allows for the conversion of the analog voltage signal from the amplifier into a digital format. This conversion is vital for displaying the pressure readings on a digital display, making it user-friendly and easily interpretable. The ICL7107 is known for its accuracy and reliability in low-power applications, making it suitable for this type of circuit.
Additionally, the circuit output is versatile, allowing for connection to both analog and digital voltmeters. This feature enhances the circuit's functionality, enabling users to choose their preferred method of reading the pressure measurement. The design ensures that the pressure sensor circuit can be utilized in various applications, including industrial processes, HVAC systems, and laboratory environments, where precise pressure monitoring is essential. Overall, this circuit effectively combines sensing, amplification, conversion, and display technologies to provide a comprehensive pressure measurement solution.A pressure sensor circuit, a pressure sensor is nominal resistance 120n. The amplifier circuit is the use AD521 op amp gain of 100. It consists of Rs/Rc; decision; A/D converte r using ICL7107, with a digital display of pressure measurement. AD5 21 The output can also be connected to an analog or digital voltmeter shows the pressure measurement.
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