Activity for Andy aka
| Type | On... | Excerpt | Status | Date |
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| Edit | Post #276319 | Initial revision | — | almost 5 years ago |
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A: How to avoid shoot-through in MOSFET bridge drivers To avoid shoot-through you should ensure that the active-low P-channel MOSFET gate drive voltage never overlaps with the active-high N-channel MOSFET gate drive voltage. With an inverter driving the N-channel MOSFET's gate, the increased propagation delay can often mean that the N-channel device rema... (more) |
— | almost 5 years ago |
| Edit | Post #276318 | Initial revision | — | almost 5 years ago |
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How to avoid shoot-through in MOSFET bridge drivers I'm using a variable duty cycle square-wave oscillator to drive a half-bridge MOSFET pair like this. Upper MOSFET is P-channel type, lower MOSFET is N-channel type: - Image alt text And, I think I'm getting shoot-through current pulses. Is there a simple way to resolve this? (more) |
— | almost 5 years ago |
| Comment | Post #276293 |
Yes, the diff tool needs fixing because it will cause issues when people start using the site more. (more) |
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| Comment | Post #276293 |
If you were then rest assured, if you'd left me a comment, I'd have fixed it. I'm very wary about anyone editing my posts but I'm quite happy to receive a comment. (more) |
— | almost 5 years ago |
| Edit | Post #276293 |
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| Comment | Post #276293 |
@manassehkatz I see you made an edit suggestion but I see nothing in what you did actually changed anything. If you are going to make an edit then please ask first out of politeness and don't assume that I will agree to it. I rejected the edit on that basis. I've now edited the post because of a spel... (more) |
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| Edit | Post #276295 | Initial revision | — | almost 5 years ago |
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A: Electrolytic capacitor lifetime rating The lifetime rating is (usually) quoted as "so many" hours at a certain temperature and that is the crucial thing to be aware of. For instance, consider a capacitor like this one: - Image alt text Some in the range are only rated for 5,000 hours at 105 °C but, if they were run at an average tem... (more) |
— | almost 5 years ago |
| Edit | Post #276293 | Initial revision | — | almost 5 years ago |
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Electrolytic capacitor lifetime rating If you search through the electrolytic capacitor offerings from distributors like Farnell, RS, Digikey or Mouser, you find that the maximum life-time rating is commonly quoted as 5,000 or 10,000 hours at such and such a temperature. If I divide 10,000 hours by 24, I get 417 days = 1.14 years. This... (more) |
— | almost 5 years ago |
| Edit | Post #276262 |
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— | almost 5 years ago |
| Comment | Post #276206 |
The question isn't this: *How can I acquire electronic parts/items/modules* - the question is how to ensure that there is minimal risk of them being unsuitable. The "and" in the question is very important. So, your section on where to buy them is missing the point. I also think it's wrong that you u... (more) |
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| Edit | Post #276267 | Initial revision | — | almost 5 years ago |
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A: Pi-Filter for EMC > What would be the main considerations to use Pi-filters for EMC? Using the filter correctly and understanding its limitations EMC or EMI (electromagnetic interference) is noted for its high frequency energy content. Applying a \$\pi\$ filter like the one below can significantly attenuate tho... (more) |
— | almost 5 years ago |
| Edit | Post #276262 |
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| Comment | Post #276263 |
@Olin I'm using google chrome and I still can't see it - bug alert!!! (more) |
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| Comment | Post #276263 |
@Olin your image is not showing. I am going to add more sections to this answer so it might be that your answer "what Andy described" might not hit the mark in terms of the fullness of what I hope to complete! (more) |
— | almost 5 years ago |
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| Edit | Post #276262 | Initial revision | — | almost 5 years ago |
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A: Low loss impedance matching without a transformer Low-pass impedance transformation Image alt text Theory Input Impedance: - $$Z{IN} = j\omega L + \dfrac{\dfrac{RL}{j\omega C}}{RL + \dfrac{1}{j\omega C}} = j\omega L +\dfrac{RL}{1 + j\omega RL C} = \dfrac{j\omega L - \omega^2 RL LC + RL}{1 + j\omega RL C}$$ Multiply numerator and denom... (more) |
— | almost 5 years ago |
| Edit | Post #276261 | Initial revision | — | almost 5 years ago |
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Low loss impedance matching without a transformer I have a signal at 10 MHz produced from a 50 Ω source. How can I match that to a 300 Ω load with low losses without using an RF transformer (space constraints)? Are there any circuits and formulas that can help me achieve this? (more) |
— | almost 5 years ago |
| Edit | Post #276225 |
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