Activity for Andy aka
| Type | On... | Excerpt | Status | Date |
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| Edit | Post #276403 |
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— | almost 4 years ago |
| Edit | Post #276403 |
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| Edit | Post #276403 | Initial revision | — | almost 4 years ago |
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A: Humming noise from a boost converter's inductor A couple of problems stick out; one glaring and one a little subtler. Read this in the data sheet: - Image alt text You have the enable pin connected to your 25 volt output. I'm not saying this is definitely causing your problems but you might well have broken the chip in some way that gives yo... (more) |
— | almost 4 years ago |
| Edit | Post #276349 |
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| Edit | Post #276348 |
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— | almost 4 years ago |
| Edit | Post #276349 |
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— | almost 4 years ago |
| Edit | Post #276349 |
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— | almost 4 years ago |
| Edit | Post #276348 |
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— | almost 4 years ago |
| Edit | Post #276349 | Initial revision | — | almost 4 years ago |
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A: What benefit has a differential amplifier when measuring a sensor signal? General cause of noise/interference The interference can be distant (such as lightning) or much closer (such as cables connecting "other" equipment) but, whatever the source, interference can be regarded as "dosing" the same energy onto both sensor wires (whether screened or un-screened). Non-d... (more) |
— | almost 4 years ago |
| Edit | Post #276348 | Initial revision | — | almost 4 years ago |
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What benefit has a differential amplifier when measuring a sensor signal? What benefit has a differential amplifier when measuring the signal from a sensor that is remotely located such as in this example: - Image alt text Why can't I use an arrangement like this: - (more) |
— | almost 4 years ago |
| Edit | Post #276336 |
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| Edit | Post #276335 |
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— | almost 4 years ago |
| Edit | Post #276336 |
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— | almost 4 years ago |
| Edit | Post #276336 |
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— | almost 4 years ago |
| Edit | Post #276335 |
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— | almost 4 years ago |
| Edit | Post #276336 | Initial revision | — | almost 4 years ago |
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A: Op-amp output error voltage Input offset voltage \$V{OS}\$ Your problem might be input offset voltage or \$V{OS}\$. This can be several milli-volts and manifests as this modification to your original circuit (in red): - Image alt text So, for an op-amp like the LM358 or LM324, you can expect a typical \$V{OS}\$ of abou... (more) |
— | almost 4 years ago |
| Edit | Post #276335 | Initial revision | — | almost 4 years ago |
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Op-amp output error voltage I've built a non-inverting op-amp amplifier with a gain of 101 using this circuit: - Image alt text My input is 10 mV DC and I expected to measure 1.01 volts at the output but I measure 0.81 volts. What has happened to cause this error? (more) |
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| Edit | Post #276225 |
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| Edit | Post #276225 |
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| Edit | Post #276319 |
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| Edit | Post #276319 |
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| Edit | Post #276319 |
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| Edit | Post #276318 |
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| Edit | Post #276319 | Initial revision | — | almost 4 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 4 years ago |
| Edit | Post #276318 | Initial revision | — | almost 4 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 4 years ago |
| Comment | Post #276293 |
Yes, the diff tool needs fixing because it will cause issues when people start using the site more. (more) |
— | almost 4 years ago |
| Edit | Post #276293 |
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— | almost 4 years ago |
| Edit | Post #276295 |
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— | almost 4 years ago |
| Edit | Post #276293 |
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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 4 years ago |
| Edit | Post #276293 |
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— | almost 4 years ago |
| 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) |
— | almost 4 years ago |
| Edit | Post #276295 |
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| Edit | Post #276295 |
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| Edit | Post #276295 |
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— | almost 4 years ago |
| Edit | Post #276295 | Initial revision | — | almost 4 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 4 years ago |
| Edit | Post #276293 | Initial revision | — | almost 4 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 4 years ago |
| Edit | Post #276262 |
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— | almost 4 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 #276262 |
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| Edit | Post #276267 |
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