Digital Pressure Gauge
The circuit design centers around the Intersil ICL 7106, a precision analog-to-digital converter (ADC) specifically suited for applications requiring high accuracy and low noise. The LED display module connected to the ICL 7106 serves to visually represent the pressure readings in a user-friendly format. The Sensym SX100pn pressure transducer operates within a Wheatstone bridge configuration, which is essential for converting the mechanical pressure into an electrical signal. This configuration enhances sensitivity and accuracy by balancing the bridge, allowing for precise measurement of small changes in resistance caused by pressure variations.
The operational amplifier circuit (IC1A, B, C) is critical in translating the small voltage changes from the pressure transducer into a usable DC voltage signal. The gain set by resistor R6 ensures that the output voltage reflects the full-scale sensitivity of the transducer, thereby allowing the system to accurately measure and display pressure up to 100 psi. The zero adjustment provided by R16 is vital for calibrating the system, ensuring that the output accurately reflects zero pressure when no pressure is applied.
Powering the entire circuit, IC3 regulates a +5 V supply, which is necessary for the proper functioning of the ICL 7106 and the operational amplifiers. This regulated voltage ensures stable operation and consistent performance of the gauge across its operational range. Overall, this design effectively combines precision measurement with user-friendly display capabilities, making it suitable for various applications in pressure monitoring and control systems. Using an intersil ICL 7106 A/D converter chip and an LED display module, this gauge uses a Sensym Corp. pressure tra nsducer SXlOOpn (100 psi full scale) in a Wheatstone bridge configuration to drive an op amp (ICla, b, c) translator circuit that supplies a dc voltage to IC2 that is proportional to pressure. R6 sets the gain of IC1A (full-scale sensitivity) and R16 supplies a zero adjustment. IC3 provides regulated + 5 V to power the circuit. 🔗 External reference
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