Activity for Elleanor Lopezâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Question | — |
Understanding inductive ringing For my own understanding I tried modelling switching off an inductive load without a freewheeling diode to observe ringing. This is the model I used: Imagealttext 1.) Are the two main components of the resonant circuit L1 and Cwindings, where Cwindings is the inherent capacitance between the ... (more) |
— | 11 days ago |
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Step voltage 750kV lines Some gentlemen decided to throw a hook with wire over 750kV lines in Belarus. They survived, however, I find in interesting to find out why. Assuming the connection to Earth was solid, there would be a large fault current and a gradient with step voltage: Imagealttext According to Mike Holt in... (more) |
— | 2 months ago |
| Answer | — |
A: Ground pour on outer layers on 4-layer PCB You have mentioned a few points yourself, so I will try to comment on those points and perhaps suggest some reasons to add or not to add a ground plane. You mentioned twisting (I suppose warping) of the board. I believe there is a chance this happens if the board is not symmetrical copper wise, so... (more) |
— | 11 months ago |
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How to convert dv/dt of noise into frequency for filter capacitor selection? Noise can be coupled between signal lines through parasitic capacitance formed between these signal lines, as $i = C\frac{dv}{dt}$ where C is the capacitance between the signal lines. Another way of noise coupling into signal lines is through inductive coupling, where changing magnetic fi... (more) |
— | 11 months ago |
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Titanic submarine control considerations The submarine built by OceanGate went missing on 18th June 2023. A lot of online criticism was directed towards the control hardware of the submarine - Logitech F710 controller. Imagealttext Imagealttext However, why is this the case? It has 2 dual axis potentiometers and some capacitive sensing... (more) |
— | 11 months ago |
| Question | — |
Cable voltage rating I was looking for guidelines of how to select appropriate cables for applications (I am interested in DC), I found IEC 183 standard which talks about high voltage cable selection for AC. Also, the status of the document is shown as withdrawn, so I assume it is not applicable. I found another docum... (more) |
— | 11 months ago |
| Question | — |
micro-RF connector crimping options Do micro-RF connector mating crimp connectors are ever sold separately together with a crimp tool? For example thisImagealttext I have looked through a lot of pages, and can only find PCB connectors + cable assemblies sold. Are RF connectors manufacturer specific and they do not share the crimp to... (more) |
— | 11 months ago |
| Answer | — |
A: Siglent1104 oscilloscope channels lagging It was a firmware issue. SDS1xx4X-E Firmware Revision History And Update Instructions The hardware delay between ADC acquisitions was not accounted for. I flashed the scope with new firmware and the delay is gone (more) |
— | almost 2 years ago |
| Question | — |
Siglent1104 oscilloscope channels lagging First I noticed that clock begins before chipselect gets pulled low on SPI. After eliminating potential sources I started to suspect the scope. I connected all 4 channels to function generator at different frequencies and observed 25ns gap between channel pairs. The probes were all the same 100Mhz st... (more) |
— | almost 2 years ago |
| Question | — |
Unexpected impedance spike when paralleling capacitors I was watching a video from EEVBLOG about bypass capacitors, and he presented a theory that randomly connecting different values of capacitors in parallel can create unexpected impedance spikes: Image alt text To inspect the picture, right click and open in new tab, the scales are then visible. Reg... (more) |
— | almost 2 years ago |