Activity for Andy aka
| Type | On... | Excerpt | Status | Date |
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| Comment | Post #291411 |
Elleanor, that is correct. That is the case. (more) |
— | 7 days ago |
| Edit | Post #291411 |
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— | 7 days ago |
| Edit | Post #291411 | Initial revision | — | 7 days ago |
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A: Understanding inductive ringing > are there more elements contributing to this effect that I have not placed in the circuit? Well, you have a simulator and it should be really easy to remove Cwindings and observe if the ringing frequency alters. If it does then there is another capacitor hidden away in your circuit (aka drain... (more) |
— | 7 days ago |
| Edit | Post #291391 |
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— | 8 days ago |
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— | 9 days ago |
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— | 9 days ago |
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— | 9 days ago |
| Edit | Post #291391 | Initial revision | — | 9 days ago |
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A: Power Line Filter - Loaction of Cy and CMC > Why are CY capacitors on the source side, and not on the load side? You may not be grasping what the image shows. The left-side port connects to the AC power-line. It supplies power to the right-side port via the filter. The right-side port (called power supply) is in fact a switch mode suppl... (more) |
— | 9 days ago |
| Comment | Post #291295 |
Where did the image of the PCB layout come from? It's not in the mini-circuits document you linked. Please also show the schematic as an image. (more) |
— | about 1 month ago |
| Comment | Post #291238 |
Then send it back to the supplier and demand a new one. (more) |
— | about 1 month ago |
| Comment | Post #291213 |
1) Use a white back ground
2) Crop so that wasted image spaces are minimized
3) Use a decent resolution
4) Remove information from the image that doesn't relate to the question
5) Check that your posted images are clear and concise. (more) |
— | about 2 months ago |
| Comment | Post #291110 |
The PLC is meant to be weather protected so there's no way that it should see humidity levels that low. (more) |
— | about 2 months ago |
| Comment | Post #291085 |
Nevertheless, the TVS diodes are offering no protection and, they would likely protect the device if chosen to be the right voltage rating (irrespective of root cause). (more) |
— | about 2 months ago |
| Edit | Post #291086 |
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— | about 2 months ago |
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— | about 2 months ago |
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— | about 2 months ago |
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— | about 2 months ago |
| Edit | Post #291086 | Initial revision | — | about 2 months ago |
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A: LED driver with feedback through light. Which feedback topology is better? > Which topology is preferable? The one below because the LED driver is less likely to produce instability and, if it does, you can always tweak C4 (upwards) in order to kill-off the potentially oscillatory pole produced in the response in your first circuit. How to draw schematics that prov... (more) |
— | about 2 months ago |
| Edit | Post #291085 | Initial revision | — | about 2 months ago |
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A: MAX485 transceivers breaking, Pi filter generating spikes? What part of the absolute maximum ratings for the A and B data lines do you think would be protected by 33 volt TVS diodes: - Imagealttext If the chip is powered from a 5 volt supply then you use 5.6 volt TVS diodes to ground. Maybe you can raise the TVS to 10 volt if you have a lot of common-m... (more) |
— | about 2 months ago |
| Comment | Post #291025 |
You have to make sure that the op-amp doesn't deliver significantly more than a 90 degrees open loop phase shift at loop gains greater than unity. Most op-amps will be fine but, if you really push things too far to get a rapid response you might come unstuck. Source followers do not have the "only on... (more) |
— | 2 months ago |
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— | 2 months ago |
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— | 2 months ago |
| Edit | Post #291025 | Initial revision | — | 2 months ago |
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A: MOSFET drain current ringing in saturation region It's got nothing to do with the MOSFET's miller capacitance. Miller capacitance causes problems in common-source circuits but, your circuit is common-drain (or source follower) hence, with a steady DC voltage on the drain (your power supply), there can be no problematic feedback via the miller capaci... (more) |
— | 2 months ago |
| Edit | Post #291004 | Initial revision | — | 2 months ago |
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A: Matched transistors If the data sheet doesn't indicate that the two devices are matched then sorry, they probably are not and, you should use a matched device like the PMP5201Y that you linked. That data sheet mentions "match" 16 times and 3 times on page 1: - Imagealttext There are zero occurrences of the word "m... (more) |
— | 2 months ago |
| Edit | Post #290603 |
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— | 4 months ago |
| Edit | Post #290603 | Initial revision | — | 4 months ago |
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A: High voltage transformer design > When should a transformer core be potted? Should it be potted at all? For this type of job, you would pot the transformer when you can't obtain the necessary creepage and clearance between the secondary (raised externally to 10 kV) and the low-voltage parts of the transformer (including the f... (more) |
— | 4 months ago |
| Comment | Post #290591 |
You asked about inner layers and, to answer that, the number of layers and secondary voltage need specifying. (more) |
— | 4 months ago |
| Comment | Post #290533 |
I guess I'm used to isolators for bespoke SMPSs that need tens of kV/us dv/dt withstand capability in their barrier. (more) |
— | 4 months ago |
| Comment | Post #290533 |
The ADI devices have very small clearance and, no doubt not zero barrier capacitance so, depending what voltage is rattling around on one side of the isolator relative to the other might mean quite significant barrier currents. I'm mentioning this in case you over-looked it. A device may be protected... (more) |
— | 4 months ago |
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