# Questions tagged [wheatstone-bridge]

A circuit to measure an unknown resistance.

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### How to simulate for the Gain of opamp Bridge Differential Amplifier?

Hi experts, I have this circuit, with a bridge connected to an op-amp in differential form, and I want to simulate it for the Gain of the circuit in PSPICE. I have found it's gain by hand, which comes ...
51 views

### Wiring of INA128 instrumentation amplifier to Wheatstone bridge

Is there any issue with the wiring or calculations of my INA128 instrumentation amplifier to my load cell Wheatstone bridge? Currently I see no change in the output when connected to the oscilloscope. ...
63 views

### Wheatstone bridge connected to op-amp: confusion about Vout formula

I am not sure when the correct formula for Vout is Vout = G(VA - VB) or Vout = -G(VA - VB). Can you explain the difference between these two examples? The circuits and the formulas provided are from ...
47 views

### Choosing points for analysing equivalent resistance

I realized there is something fundamental about equivalent resistance I don't understand in terms of application. I understand the part about mechanically simplifying resistors into one resistor, just ...
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1 vote
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### Input/output resistance for an accelerometer/Wheatstone bridge

I am looking at the MS 3028 Piezoresistive Accelerometer. This is the internal schematic of the component, as a Wheatstone bridge, which per my understanding means it's a quarter bridge with other ...
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1 vote
410 views

### Very irregular reading of load cells with the hx711 (on an ESP32)

I'm using an ESP32-S3-WROOM-1U and a four load cells, connected in a full Wheatstone bridge to an HX711 to read the weight of an ...
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### Wheatstone bridge to voltage follower circuit not working as expected

I am designing the following circuit shown in the atached image. It is a wheatsone bridge with the differential output attached to voltage followers on each terminal and then connected to a single ...
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### How to demodulate a signal that was frequency-modulated by an offset sine?

I have a strain-gauge (SG) in a Wheatstone-bridge (WB) configuration that I would like to measure on the 0-250Hz band on 16 bit ...
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296 views

### How can I apply Kirchoff Law for a capacitor in Wheatstone Bridge?

I got this question in an exam, where I was given an unbalanced Wheatstone bridge and was asked to find the voltage across the capacitor. I can't understand how to apply Kirchhoff's laws for a ...
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1 vote
125 views

### How do you compensate for a varying DC offset when using a wheatstone bridge?

Background I have a sensitive magnetic sensor that is packaged as a wheatstone bridge with a 20k device resistance. I am using it to measure the rotation of a magnet. It is possible to calibrate out ...
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1k views

### Wheatstone Bridge with Instrumentation Amplifier

I have set up this circuit: I measure an output of 0.61 V from the instrumentation amplifier. The gain of the amplifier is set to 21. The formula for the output is given by: Uout=(1+2R1/Rg)×(R3/R2)×(...
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### Online motor inductance measurement at different rotor angle

I wanted to measure the inductance of PMSM at different rotor angles. I'm familiar with the offline methods of measuring motor inductance but would like to measure a motor's inductance while it's ...
1 vote
113 views

### Analysis of Wheatstone Bridge circuit with connected output terminals

I am given the following case of a Wheatstone Bridge circuit where the output Terminals $U_{a}$ and $U_{b}$ are connected with a wire and need to derive both output voltages as functions of the ...
93 views

### Determining resistors in a Wheatstone Bridge from Ohmmeter readings - Unsolvable system of equations

I have been challenged in an assignment that uses a Wheatstone bridge to find values for the resistances in each arm, given that they are 1 kOhm +- 1%, and using only Ohmmeter readings and short-...
62 views

### Help testing Pressure Sensors

I have a few ME600 Metallux sensors that I harvested from some discarded products. I want to build a project with these but would like to verify they work before getting too far. From the datasheet ...
1k views

### Unbalanced Wheatstone bridge with a capacitor in the middle

I have to find the amount of charge stored in a capacitor after a significant amount of time when $$R_{1}=1 k \Omega, R_{2}=8 k \Omega, R_{3}=4 k \Omega, R_{4}=2 k \Omega,C=1\mu F,V=10V$$ There is no ...
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### How do I find the value of resistor 4? [closed]

Assuming this is balanced: if R1 is 130 Ω, R2 is 240 Ω, and R3 is 65 Ω, then what is R4?
73 views

### Pressure sensor output not clear from datasheet

Planning to use the following sensor: https://shop.bb-sensors.com/Druck/Drucksensoren/ Part number SHOP 0391 0004-02M. I am planning to give 3.3 VDC to sensor. Pressure input will be 0 to 10 bar. It ...
289 views

### Total resistance of circuits that resemble Wheatstone bridges

I need to find the total resistance that is seen from terminals a and b for the three circuits below. I found that all of the circuits have the same total resistance Rt=R (not sure if the answer is ...
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1 vote
246 views

### Superposition theorem for a Wheatstone bridge

I'm applying the superposition theorem to a Wheatstone bridge. I attached the picture. In this circuit there are two voltage generators: the first/top one is replaced by a wire. That's why there is a ...
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### Am I wiring this sensor / wheatstone bridge correctly?

I have a methane sensor (MP7227-DA) that gives the following schematic: I've assumed R1 and R2 = (C) and (D) in the diagram, R3 and R4 are resistors which are equal and make up the other side of the ...
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77 views

### Constant temperature operation of microheater

I have been trying to make a constant temperature control for microheaters based on this wheatstone bridge circuit, using a trim pot to set the temperature setpoint. The purpose is to keep the heater ...
492 views

### Read 2-wire or 3-wire temperature sensor by unique connection to Arduino

I have 2 types of temperature sensors, 2-wire, and 3-wire RTD I look on the internet and I've seen many schematics use the simple voltage divider for 2 wire sensors and the Wheatstone bridge for 3 ...
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### RTD - convert measured voltage to temperature

I have a 3-wire RTD connected to a Wheatstone bridge and then to a INA. The Vout from the INA is then connected to a ADC. How can I convert the measured voltage from the ADC to the respective ...
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### Wheatstone bridge resistance and sensitivity tolerances

A pressure sensor datasheet gives its resistance as 5 kΩ +/- 1 kΩ or 3.5 kΩ +/-0.5 kΩ (optional version). The full-scale output is 150 mV +/- 30 mV at 100 psi, 5 V bridge voltage Vb. The way I imagine ...
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### Wheatstone bridge with zero offset voltage

Can I power a Wheatstone bridge circuit with a positive voltage (say +5) on one side and negative (-5) on the other, such that the output common mode voltage is at 0V? I don't see any reason why not, ...
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1 vote
113 views

### Wheatstone bridge analysis

Hello, I am facing issues in calculating few parameters for the following information. I am new to this concept of strain gauge, wheatstone bridge, and data acquisition system Four resistive strain ...
1 vote
145 views

### Puzzled by op-amp behavior in a temperature controller circuit

I have been trying to make a temperature controller based on a closed-loop control utilizing a Wheatstone bridge configuration and an op-amp. The temperature setpoint is adjusted by a trimpot. The ...
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1 vote
105 views

### Sense small variations in inductance in AC for a metal detector circuit

I am currently working on the design of a metal detector circuit. I am relying on the method that the coil's inductance would change when a metal is close to it (due to eddy currents.) I have tried ...
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3k views

### What is the point of a Wheatstone Bridge?

What is the point of a wheatstone bridge? Everywhere, like here says that it's used for measuring an unknown resistance, but I don't understand why it's so complicated. Can't you just use a voltage ...
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### How to get R_THEVENIN in Wheatstone bridge?

In the simplification of a Wheatstone bridge with Thevenin's theorem when we calculate the RThevenin as in the schematic. How to explain in another way that the resistor R1 and R3 are in parallel and ...
1 vote
388 views

### 3 wire RTD configuration Wheatstone bridge Vs. Constant Current Source

I am trying to design a 3 wire RTD circuit. I've been looking into either a Wheatstone bridge or a constant current source with ratiometric measurements. I would like to know which is the better ...
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1 vote
157 views

### Strain gauge connected to op-amp: finding its range of measurement

Given here (copied below) is a quarter strain gauge with R1 = R2 = R3 = R4 = R = 120 Ω and R4 = R + ΔR as the variable resistance, where the change ΔR is caused due to mechanical forces applied to ...
1 vote
563 views

### Are the assumptions for a Wheatstone bridge still valid while connected to a differential op-amp?

While analyzing the Wheatstone bridge independently, the same current is considered to pass through both resistors in each branch of the bridge (i1=i3 & i2=i4.) I've seen the same assumption was ...
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### Power consumption in a Wheatstone bridge

Q1) Explain how the power consumption of each resistor will change as the resistance of Rs increases. A) It is a circuit in which parallel connections of R1 and Rx and parallel connections of R2 and ...
478 views

### Op-amp - minimal differential voltage?

I want to implement a PT100 sensor measuring circuit using a Wheatstone bridge. Below is a link to the implementation that I suggested. https://www.instructables.com/Measuring-Temperature-Using-a-...
1 vote
565 views

### Wheatstone bridge current consumption

How would you calculate the total current consumption of a Wheatstone bridge made of four 350 Ω resistors, with a supply voltage of 1.8 V? And what is the theory behind this "resistor combination&...
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### Question on INA122P non-linear gain

I am trying to apply gain for a 0.0 - 16.7 mV signal with an INA122P, with a single 10 V supply for all the circuits, with Vref driven at 0.0 mV. Here is the circuit that I am using, no Rg applied, ...
1 vote
87 views

### Asking experience for this flow-through pressure sensor: 26PCAFG6G - Honeywell

I have the following sensor:26PCAFG6G The output of the signal is a differential output from a Wheatstone bridge with 0 - 1 psi, or 0 - 70.3 cmH20 corresponding to 0 - 16.7 mV, I am using AD623AN for ...
1 vote
165 views

### Low power Wheatstone bridge

I'm working on a low-power application (cycling power meter) that will use a Wheatstone bridge in half-bridge configuration to measure strain. I'd like to run this system from a coin cell (or ...
191 views

### Strange behaviour of a Wheatstone bridge

I am trying to do some strain measurements. I am using a strain gauge in a Wheatstone bridge configuration. The connection is shown in the image below: simulate this circuit – Schematic created ...
133 views

### Instrumentation opamp saturating

I'm building a circuit to measure signal out of a wheatstone bridge for strain gauge. here is the schematic: simulate this circuit – Schematic created using CircuitLab I applied +-1.5V with ...
165 views

I'm using op-amps as schmitt trigger and with the resistors in the wheatstone bridge I am trying to control the flow of current in the load. When the load resistance is not connect between the outputs ...
664 views

### Instrumentation amp giving only positive output (with + and - power supplies)

I'm using an instrumentation amp for a bridge circuit for strain gauges. However, the output range is always positive (the lowest value I can get is zero). The amp I use is AD620. For power supply I ...
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### Ratiometric AD conversion with high excitation voltage

Still working on a Wheatstone bridge sensor (a load cell); for reasons unknown it insists to be excited with at least 8V (manufacturer gave no assistance, simply state 10V as nominal excitation) ...
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### Wheatstone bridge

I need help with solving the following Wheatstone bridge circuit. I don't know the value of the resistances nor the capacitor. Where or how do I get started to calculate them? The variable resistance ...
1 vote
110 views

### Is it possible to connect a Vin to a ref of an instrumentation amplifier?

I have a circuit in which I need an instrumentation amplifier (INA128 (datasheet)) to be connected correctly for it to work. I don't know if it needs another resistance or if the input needs to be ...
116 views

### Can I drive a bridge sensing circuit with a voltage reference?

On the specification sheet there is this application circuit where the sensing bridge circuit is driven by the same voltage reference IC that sets the voltage reference (REFP) of the ADC. I remembered ...
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