Activity for Andy aka
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
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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) |
— | 10 months ago |
| Comment | Post #290591 |
You asked about inner layers and, to answer that, the number of layers and secondary voltage need specifying. (more) |
— | 10 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) |
— | 11 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) |
— | 11 months ago |
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— | 11 months ago |
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| Edit | Post #290465 | Initial revision | — | 11 months ago |
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A: Speed of EM waves from the point of view of an electrical engineer A loss-less coaxial cable has inductance and capacitance and, their associated formulas introduce \$\epsilon\$ and \$\mu\$. But, to home-in on the velocity of propagation, the characteristic impedance must also be determined. We can avoid the complexity of the telegrapher's equations by looking at a ... (more) |
— | 11 months ago |
| Edit | Post #290463 |
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— | 11 months ago |
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Speed of EM waves from the point of view of an electrical engineer An important formula in physics is one that relates the speed of an EM wave (c for instance) with the magnetic permeability and electric permittivity of the medium. In short: - $$c = \dfrac{1}{\sqrt{\epsilon\cdot\mu}}$$ Where \$\epsilon\$ is the absolute value of permittivity of the medium and,... (more) |
— | 11 months ago |
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A: Transformer design for a Series Resonant Converter > The website that I mentioned before mentions the max flux density in ferrites at 400 kHz as being close to 0.04 T. Is this correct? No, you have misinterpreted the graph. The graph shown is flux density (not maximum flux density) and is only telling you one thing; that if you increase the frequ... (more) |
— | 11 months ago |
| Comment | Post #290448 |
The graph on the website you linked doesn't tell you anything other than current reduces in an inductor by a factor of ten when the frequency rises by a factor of ten. In other words it's useless padding by Magnetics to make their page look impressive. When current reduces by ten, flux density reduce... (more) |
— | 11 months ago |
| Comment | Post #290448 |
**I think this calculation is wrong. The website that I mentioned before mentions the max flux density in ferrites at 400 kHz as being close to 0.04 T. Is this correct?** That is not correct and neither do I see that being mentioned on the link to the magnetics website. Also, why are you using an LLC... (more) |
— | 11 months ago |
| Comment | Post #290284 |
Maybe your capacitors are acting microphonically and some (that are more microphonic) take longer to get a settled reading. It's a long shot but, it's all I could think of. I think it might also be related to the triboelectric effect. (more) |
— | 12 months ago |
| Comment | Post #290231 |
It's too broad. Any answers will become out of date. What the OP asks for may be country specific. It shows virtually no details of what the OP may have done already. (more) |
— | about 1 year ago |
| Comment | Post #290047 |
Links within your link show how they work and should answer your question. Please explain what it is that you don't understand after working your way through those links. (more) |
— | about 1 year ago |
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— | about 1 year ago |
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| Edit | Post #289850 | Initial revision | — | about 1 year ago |
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A: What are some best practices for library management? There is no definite answer to this but, if you want my advice, you store all symbols and footprints locally with your project. Of course you may begin by using standard parts from a global (comes-with-the-installation) location that isn't under your control but, as soon as you can migrate the ones y... (more) |
— | about 1 year ago |
| Comment | Post #289574 |
Please provide a link to the **pdf** data sheet for the supply (more) |
— | about 1 year ago |
| Comment | Post #289570 |
What does this mean --> open the gate (more) |
— | about 1 year ago |
| Comment | Post #287196 |
Tony, why would I want to do what you did? It's a formulaic solution I require and not numbers. (more) |
— | about 1 year ago |
| Comment | Post #289473 |
A different way to mine and the other solved answer (in fact all 3 are different) but, I guess it's telling me that there is no insightful method to solve this. Thanks for your hard work. (more) |
— | over 1 year ago |
| Comment | Post #276295 |
That's a bit of a bugger but, you can't always rely on external websites!!! (more) |
— | over 1 year ago |
| Comment | Post #276200 |
Lorenzo, I just drew the pictures by hand in word or paint or both. (more) |
— | over 1 year ago |
| Comment | Post #289186 |
Thanks. That's cleared it up. (more) |
— | over 1 year ago |
| Comment | Post #289186 |
Are you saying that previous accumulated votes gained on meta have now been deducted? (more) |
— | over 1 year ago |
| Edit | Post #289183 | Initial revision | — | over 1 year ago |
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Apparent loss of reputation in last 24 hours Has anyone else noticed a loss of reputation recently. I thought I checked yesterday and my reputation was a hundred points higher at 1889. Now it is at 1789. My vote summary doesn't indicate a loss. I also reckon that Olin and Lundin have also suffered, particularly Lundin (if suffered is the right ... (more) |
— | over 1 year ago |
| Comment | Post #288688 |
Low audio is not 5000 kHz; neither is it 5 kHz. 0 Hz is impossible too so, be reasonable on this vital specification. (more) |
— | over 1 year ago |
| Comment | Post #288222 |
The block diagram is meaningless. The words that follow it appear to describe a circuit; don't do that; draw it. Where is the link to the product's data sheet or manual? (more) |
— | over 1 year ago |
| Comment | Post #288159 |
How can you do an open circuit test of a motor or any device that acts as an electrical load. It doesn't make sense. (more) |
— | over 1 year ago |