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Educational board for strain gauges, Wheatstone bridges and op-amps
I show you a little device that I built so I can explain more things related to strain gauges, Wheatstone bridges and differential amplifiers. My circuit is not new, in fact, I reverse-engineered an already existing circuit from AliExpress. The circuit is an easy-to-find strain gauge amplifier module. It is a neat little circuit with a built-in Wheatstone bridge and a dual OP-AMP (typically an LM358 or a TP09) with a potentiometer to shift the output voltage. I already used this circuit in some of my older videos.
The original circuit is made with SMD components, so it takes time and effort to understand the circuit. I know that there are schematics shared on the internet, but as a practice, I first reverse-engineered the circuit with a multimeter in continuity mode, and then I looked at the publicly available schematic to see if I made any mistakes. Then, I designed a PCB with through-hole components to make it easy to replicate. I added a bunch of test points to places where it can be interesting to measure the voltages. I designed the board in a way that it can potentially be used for example in an electronics lab at a school where the students have to learn about strain gauges, Wheatstone bridges and operational amplifiers. I think this circuit is very useful to understand the concepts of these previously mentioned components.
In my circuit, I used passive components with 1% tolerance which seemed to be a mistake, or at least it created a "not too optimal" situation when I tried to compare my measurements with the formulas. When it is possible, go for components with 0.1% or even 0.01% tolerance and try to match the components as well as possible, especially for the first stage of the amplifier.
For the parts list, please check the attached interactive BOM.
Educational board for strain gauges, Wheatstone bridges and op-amps
*PCBWay community is a shared platform and we are not responsible for any design issues.
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- Thimote DANIS Oct 28,2023
- Engineer Aug 16,2023
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