ground neutral issue
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BigBrownBox 6 months ago
![Schematic_resistors_2021-03-11.png](//image.easyeda.com/pullimage/1qWRlbDrr8TEGiYwZ8QI4wh7qzpPSMXg721HdrG2.png) Hi, When i run simulation DC drops neutral phase, when i connect capacitor it messes up sine wave on R5. Switching GND fixes DC but destroys AC. Am i asking to much of simulation or doing something wrong?
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andyfierman 6 months ago
Please  study the Simulation Tutorial: [https://docs.easyeda.com/en/Simulation/Chapter5-Probing-Signals/index.html](https://docs.easyeda.com/en/Simulation/Chapter5-Probing-Signals/index.html)
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BigBrownBox 6 months ago
Thanks andyfierman, I read that but didn't shed any light on my issue. If I separate circuits on different pages they probe just fine. When combined on same page(ac + dc) they don't. Really would like you to tell me what I'm doing wrong as I don't know.
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BigBrownBox 6 months ago
![Screenshot (2).png](//image.easyeda.com/pullimage/nqoC6r20YQJb7EyeKI04FxTXe4d9V86NfBVCUzjD.png)
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BigBrownBox 6 months ago
![Screenshot (3).png](//image.easyeda.com/pullimage/qe8IPE2HVH5erQZLyhsbkuEIEf2ltbzozk9LbJRf.png)
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BigBrownBox 6 months ago
This is what happens when I switch GND to dc circuit
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BigBrownBox 6 months ago
This is what happens to AC when i switch ground. ![Screenshot (4).png](//image.easyeda.com/pullimage/RI4s3JvUheOOsPXLXudjCCTZY3G2zeCkd6CtE1PO.png)
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BigBrownBox 6 months ago
When ground is attached to AC circuit. ![Screenshot (5).png](//image.easyeda.com/pullimage/lDtgFxnY76tSmQRzmBt5tNV6MJM0ta4ALxj2Yo7C.png)
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andyfierman 6 months ago
If you make your simulation project public I can explain what you are seeing.
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andyfierman 6 months ago
@BigBrownBox, I suggest that: 1. you remove R1 - R5 as they are completely irrelevant to your simulation;  2. start with R7=1m and once you have understood what you are seeing, try increasing the value to understand the effect it has; 3. fully connect C1 and just vary the value from 1p up to whatever you wish. Do not however, just leave either or both ends of C1 floating in the circuit. In the meanwhile, this demonstration project should help you understand what you are seeing: [https://oshwlab.com/andyfierman/Bridge_rectifier-e5be2d957e1044e5bad584566223e2a1](https://oshwlab.com/andyfierman/Bridge_rectifier-e5be2d957e1044e5bad584566223e2a1)
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BigBrownBox 6 months ago
Thank thank thank you! Diff_V_Probe did the trick. If anyone's interested its the beginnings of soft start circuit I'm making to stop inverter freaking out on inrush. Explanations of R1 to R6 can be found here public project. [https://oshwlab.com/BigBrownBox/resistors](https://oshwlab.com/BigBrownBox/resistors)
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andyfierman 6 months ago
@BigBrownBox, Glad you've got it now. This is why I recommended that you study the Simulation Tutorial: [https://docs.easyeda.com/en/Simulation/Chapter5-Probing-Signals/index.html](https://docs.easyeda.com/en/Simulation/Chapter5-Probing-Signals/index.html)<br> <br> because the importance of understanding that voltages are measured relative to ground and usage of the Diff_V_Probe are described and demonstrated in an example in there. You will find it helpful to go through the whole of the Simulation Tutorial in order, starting with the Preliminary Remarks. :)
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