Activity for Andy aka
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Answer | — |
A: Driving ADC with opamp with large rails > Is the risk of the opamp overdriving the ADC too great for no input protection to be used? I would certainly say yes but, this can usually be easily solved by using a current limit resistor in the feed line to the ADC. Most ADCs specify a maximum current that their inputs can take. This is an... (more) |
— | almost 4 years ago |
| Edit | Post #279961 | Initial revision | — | almost 4 years ago |
| Answer | — |
A: Transformer - Vsec or Current rating parameter > If I connect this to a 12V supply and expose it to 10us pulse: 12V10us/475uH = 252mA $$$$ This current flows in the primary magnetization inductance (475 μH) after applying 12 volts for 10 μs. This causes core saturation based on the volt-second figure limit of 11 volt-μs. $$\dfr... (more) |
— | almost 4 years ago |
| Comment | Post #279816 |
It makes zero sense trying to create a flyback converter to activate a MOSFET when you can just apply 100 kHz to a transformer, rectify the output and use that as the MOSFET gate signal. Why go to all this bother? Why worry about such a small ripple voltage. Sounds like an XY problem to me. (more) |
— | almost 4 years ago |
| Comment | Post #279816 |
Your circuit makes no sense to me. The nodes POWER IN and POWER OUT cannot be outputs so, where is the load connected? (more) |
— | almost 4 years ago |
| Comment | Post #279728 |
@2kind - don't be silly - that only applies to an AC voltage source where the MOSFETs alternate at blocking. This is a DC application as in "battery". (more) |
— | almost 4 years ago |
| Comment | Post #279728 |
Superior architecture: you don't need two series MOSFETs. What made you think you did? (more) |
— | almost 4 years ago |
| Comment | Post #279600 |
@pacifist - learn flash ADCs then single slope ADCs, then dual slope ADCs, then successive approximation in that order before going anywhere near sigma delta. If you haven't learnt those first it will be like trying to understand calculus without having a decent training in algebra and numbers. Cart... (more) |
— | almost 4 years ago |
| Comment | Post #279600 |
Do you know how a successive approximation ADC works? (more) |
— | almost 4 years ago |
| Comment | Post #279602 |
I also agree with @Olin on this particular question. (more) |
— | almost 4 years ago |
| Comment | Post #279554 |
@mithical yes there are. (more) |
— | almost 4 years ago |
| Comment | Post #279554 |
It also appears that (some or all) answers given to questions have been erased. :¬( (more) |
— | almost 4 years ago |
| Comment | Post #279554 |
It appears that everyone's rating has taken a massive nose dive. (more) |
— | almost 4 years ago |
| Answer | — |
A: What is the difference between differential amplifier and differentiator? > I need to know what is the difference between differential amplifier and differentiator A differential amplifier amplifies the difference voltage between two signal voltages. A differentiator performs a type of mathematical calculus on a signal. The two processes are wholly unrelated. (more) |
— | almost 4 years ago |
| Comment | Post #279405 |
@tlfong01 - this (until someone tells me differently) is a question and answer site and not a blog and whether you are successful or fail or, whether you post something to github or not, that is of no interest to this site (and anyone please correct me if I've misjudged what this site is about). If y... (more) |
— | almost 4 years ago |
| Comment | Post #276138 |
It's either a poor design or it's fine. That debate depends entirely on the LED data sheet for which there is none. (more) |
— | almost 4 years ago |
| Comment | Post #279402 |
Much better now. Talking shops are discouraged. BUT, the data sheet for the device is still needed. Please supply a link to it. (more) |
— | almost 4 years ago |
| Comment | Post #279227 |
@coquelicot I think S21 would be 0 dB for a straight through wire with no added resistors. But, without documentation, it's just a guess. (more) |
— | about 4 years ago |
| Edit | Post #279227 | Initial revision | — | about 4 years ago |
| Answer | — |
A: Understanding the s11 and s21 coefficients of a microstrip line with resistor to ground In the absence of VNA product documentation...... > Now, -9 dB is equivalent to a ratio of 0.34 approximately, and -3.53 db is equivalent to a ratio of 0.66 approximately. I expected S11 to be near 0. A 9 dB return loss is a reflection coefficient of \$\pm\$0.355. Accounting for slight discrep... (more) |
— | about 4 years ago |
| Comment | Post #279080 |
Q1A) We shouldn't assume anything about the network analyser that isn't documented in the manual/data sheet. (more) |
— | about 4 years ago |
| Comment | Post #278989 |
You need to be explicit about the possible voltage levels on current in/out and how much they can vary with respect to the op-amp supplies. If you want decent immunity you should get rid of those 100 nF capacitors on the input too. A lot more information is needed and you need to be clear why you thi... (more) |
— | about 4 years ago |
| Comment | Post #278821 |
It's highly likely that your wifi uses 2.45 GHz and, it may or may not surprise you to know that microwave ovens use exactly the same part of the spectrum hence, with circa 750 watts of microwaves being produced inside the oven (and a few tens of milli watts leaking out) that leakage scatter guns the... (more) |
— | about 4 years ago |
| Edit | Post #278519 |
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— | about 4 years ago |
| Edit | Post #278519 | Initial revision | — | about 4 years ago |
| Answer | — |
A: Emitter Bypass Capacitor in a CE Amplifier > Is it because for AC signals the emitter looks like a short to ground and that essentially increases the voltage drop across the collector resistor? Yes. The gain of a common emitter amplifier is approximated by the ratio of R3 to R4 - this is when there is no emitter decoupling capacitor.... (more) |
— | about 4 years ago |
| Comment | Post #278475 |
Ground = fiction usually means poor o-scope probing. (more) |
— | about 4 years ago |
| Comment | Post #278475 |
Then we need a schematic of the actual power supply. This is exactly the problem behind answering your question - you are changing the goalposts and wasting time. I'm not going to do any physical experiments, after all? Why should I? Like I've said many times here: the devil is in the detail and you... (more) |
— | about 4 years ago |
| Comment | Post #278475 |
It also names the DC voltage as an error voltage and that is totally wrong. Like I said, the devil is in the detail and, in my humble opinion, if you want this question answering with respect to CM noise you need a believable circuit tied to a recognized power supply topology. The ElecCircuit.com pic... (more) |
— | about 4 years ago |
| Comment | Post #278475 |
The circuit is still problematic. It isn't a conventional flyback converter (that require extensive CM filtering due to a lack of earth) because flybacks don't use a bridge rectifier. So maybe it's a forward converter that deal with higher power transfer (than flybacks) and usually have an incoming e... (more) |
— | about 4 years ago |
| Comment | Post #278475 |
The circuit you have posted will not have any significant degree of common mode noise because it is not an isolating DC-to-DC converter because the same GND symbol is used on either side of the transformer. This is so absolutely the reason why a circuit is needed. The circuit will only produce differ... (more) |
— | about 4 years ago |
| Comment | Post #278477 |
I said this: *Can you adjust your question to more fully reflect your aim?* and I didn't imply it should be common mode or differential but, **what you had in mind**. I just want to restate this. (more) |
— | about 4 years ago |
| Comment | Post #278475 |
You still need to focus your question though. Asking for a schematic is also problematic because it just may not be the topology that is most appropriate to you. If I answered and you then said "yes but what about this or that converter" I'd have been wasting my time on the original answer. You have ... (more) |
— | about 4 years ago |
| Comment | Post #278475 |
I think you misunderstand it from the view of someone answering. Someone answering can make an answer aimed at a specific design and provide good information. Then, if I were answering, the way my brain seems to work is that I could sit back and think how this might be applied to similar (but not ide... (more) |
— | about 4 years ago |
| Comment | Post #278475 |
Can you adjust your question to more fully reflect your aim? (more) |
— | about 4 years ago |
| Comment | Post #278482 |
Do you want me to lie to you and say yeah it'll be fine? The above are my general thoughts. The devil is in the detail. (more) |
— | about 4 years ago |
| Edit | Post #278482 |
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— | about 4 years ago |
| Edit | Post #278482 |
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— | about 4 years ago |
| Edit | Post #278482 | Initial revision | — | about 4 years ago |
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A: Control circuit for Power Converters These are my general thoughts: - - Easiest - power management IC (PMIC) - Smallest footprint - PMIC usually - Cheapest - usually PMIC (for a certain minimum performance level) - Highest performance - PMIC will outshine all others - Best reliability - PMIC - Best stability - PMIC - Qui... (more) |
— | about 4 years ago |
| Comment | Post #278475 |
Are you talking about common mode noise that simultaneously affects both pos and neg output on the DC side (due to capacitive coupling in the transformer) or just differential noise i.e. conventional ripple artifacts? Both are treated differently and both these noise sources depend on different thing... (more) |
— | about 4 years ago |
| Comment | Post #278461 |
Surely google is a better fit to find this out. Have you googled MOSFET body diode? (more) |
— | about 4 years ago |
| Edit | Post #278448 |
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— | about 4 years ago |
| Edit | Post #278448 |
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— | about 4 years ago |
| Edit | Post #278448 |
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— | about 4 years ago |
| Edit | Post #278448 |
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— | about 4 years ago |
| Edit | Post #278448 | Initial revision | — | about 4 years ago |
| Answer | — |
A: Filter Impedance Consideration Apart from the need to match impedances to prevent possibilities of signal reflections and the knock-on issue of signal nulls at your receiver LNA input, an antenna "expects" to be terminated in the "right" impedance in order to get best performance. The ratio of E-field to H-field of a radio wave... (more) |
— | about 4 years ago |
| Comment | Post #278378 |
Your question really has nothing to do with SSB - look at how regular AM is shifted in frequency down to baseband rather than jumping straight into SSB. (more) |
— | about 4 years ago |
| Comment | Post #278342 |
ESD can cause damage that only shows itself when operating in a real circuit close to its voltage limits. In other words, ESD can degrade a component that causes it to fail early and not immediately. (more) |
— | about 4 years ago |