Activity for Andy aka
| Type | On... | Excerpt | Status | Date |
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| Edit | Post #276438 |
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| Edit | Post #276436 |
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| Edit | Post #276436 |
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| Edit | Post #276438 |
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| Edit | Post #276438 |
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| Edit | Post #276438 |
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| Edit | Post #276438 |
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| Edit | Post #276438 |
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| Edit | Post #276438 |
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| Edit | Post #276438 | Initial revision | — | over 4 years ago |
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A: How do I design a flyback converter? What are the basics I should know? Equivalent Circuit, 1:1 transformer Start by simplifying the circuit and change the transformer to a single inductor. This simplification ignores the benefits of isolation but, flyback converter theory is about transferring energy and not fundamentally about isolation: - Image alt text We al... (more) |
— | over 4 years ago |
| Edit | Post #276436 | Initial revision | — | over 4 years ago |
| Question | — |
How do I design a flyback converter? What are the basics I should know? I need to design a simple flyback converter like this: - Image alt text I want to control duty cycle from another circuit such as an MCU but, I'm unsure how to proceed. My requirements are: - - Input voltage `125 volts` - Output voltage `500 volts` - Load resistance is `10 kohm` - Tra... (more) |
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| Edit | Post #276349 |
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| Edit | Post #276348 |
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| Edit | Post #276403 |
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| Edit | Post #276403 |
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| Edit | Post #276403 |
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| Edit | Post #276403 | Initial revision | — | over 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) |
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| Edit | Post #276349 |
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| Edit | Post #276348 |
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| Edit | Post #276349 |
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| Edit | Post #276349 |
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| Edit | Post #276348 |
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| Edit | Post #276349 | Initial revision | — | over 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) |
— | over 4 years ago |
| Edit | Post #276348 | Initial revision | — | over 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) |
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| Edit | Post #276336 |
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| Edit | Post #276335 |
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| Edit | Post #276336 |
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| Edit | Post #276336 |
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| Edit | Post #276335 |
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| Edit | Post #276336 | Initial revision | — | over 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) |
— | over 4 years ago |
| Edit | Post #276335 | Initial revision | — | over 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 | — | over 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) |
— | over 4 years ago |
| Edit | Post #276318 | Initial revision | — | over 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) |
— | over 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) |
— | over 4 years ago |
| Edit | Post #276293 |
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— | over 4 years ago |