Activity for Andy aka
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #279554 |
It also appears that (some or all) answers given to questions have been erased. :¬( (more) |
— | over 3 years ago |
| Comment | Post #279554 |
It appears that everyone's rating has taken a massive nose dive. (more) |
— | over 3 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) |
— | over 3 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) |
— | over 3 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) |
— | over 3 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) |
— | over 3 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) |
— | over 3 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) |
— | over 3 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) |
— | over 3 years ago |
| Comment | Post #278475 |
Ground = fiction usually means poor o-scope probing. (more) |
— | over 3 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) |
— | over 3 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) |
— | over 3 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) |
— | over 3 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) |
— | over 3 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) |
— | over 3 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) |
— | over 3 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) |
— | over 3 years ago |
| Comment | Post #278475 |
Can you adjust your question to more fully reflect your aim? (more) |
— | over 3 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) |
— | over 3 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) |
— | over 3 years ago |
| Comment | Post #278461 |
Surely google is a better fit to find this out. Have you googled MOSFET body diode? (more) |
— | over 3 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) |
— | over 3 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) |
— | over 3 years ago |
| Comment | Post #278342 |
There are plenty of references to be found on google on this subject so pick one and, if still confused then ask a more specific question. (more) |
— | over 3 years ago |
| Comment | Post #277844 |
Olin I read through it and still genuinely don't understand what it's about. Maybe a front/top section that says what it's really all about would be helpful. Sometimes when you are inside an idea or a solution you can miss-out on explaining why it is needed or, plainly I'm just stoopid and blind. I g... (more) |
— | over 3 years ago |
| Comment | Post #276267 |
@zeke they are micro-cap!! However, I don't know what Patreon is and I don't understand the youtube reference??? (more) |
— | over 3 years ago |
| Comment | Post #276267 |
@zeke Thanks. No not on either. Are you talking about music? (more) |
— | over 3 years ago |
| Comment | Post #277301 |
Your circuit WILL NOT work with the load negative connected to ground. (more) |
— | over 3 years ago |
| Comment | Post #277301 |
Your circuit is incorrect on the output. The load needs to connect between the source and a positive supply voltage not ground. Your hyperlink doesn't work and you haven't shown the value of the MOSFET source resistor. You haven't mentioned what op-amp supply decoupling you have used either. Assuming... (more) |
— | over 3 years ago |
| Comment | Post #277051 |
@coquelicot there is capacitive coupling between all the wires in the bundle that make up the cable. L2 is not ideally split halfway of course because that would make the L2 voltage become 60 volts. (more) |
— | almost 4 years ago |
| Comment | Post #276952 |
..... I spent a whole year on one job trying to find an answer to this specific type of problem where a device had allegedly passed an impulse test but there were no records kept. In the end I concluded that someone had added TVS diodes to a design after testing had been done, didn't do their homewor... (more) |
— | almost 4 years ago |
| Comment | Post #276952 |
Can you address my questions above as a comment because I don't want to have to trawl through the whole question trying to work out things. What I can say is this: without knowing what specific testing destroyed the devices is not going to help..... (more) |
— | almost 4 years ago |
| Comment | Post #276952 |
What testing was conducted that destroyed the failed devices? Are you looking for reasons behind these failures? Can you be specific about what advice you are seeking? What insulation have the load cell bridges got from the grounded rail? What specific tests were conducted? Was it ESD or indirect lig... (more) |
— | almost 4 years ago |
| Comment | Post #276809 |
@Olin - not sure I was. I can't remember proposing a new site. Maybe it was something I said once? Hold fire on me being a mod. (more) |
— | almost 4 years ago |
| Comment | Post #276809 |
Well, it's risen back a bit from 316 to 321 but it still hasn't returned to circa 352 so, I'd say that it isn't fixed. I agree with Olin, about mods getting the right tools to do the job. As a plain ordinary user, there isn't enough information that I can find that tells me where up-votes or down-vo... (more) |
— | almost 4 years ago |
| Comment | Post #276662 |
Safe after two faults is the reason. They all, individually, have to be able to survive the input current that might pass through the fuse indefinitely. (more) |
— | almost 4 years ago |
| Comment | Post #276662 |
@Hawk2000 The barrier doesn't care about energy transferred to it; rather it's the other way round. The barrier is situated in a less onerous gas environment so clearly, it is protecting down stream (into the more onerous gas environment) from excessive energy. The barrier "buffers" anything on its i... (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 |
| 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 |
| 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 |
| 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) |
— | almost 4 years ago |
| Comment | Post #276263 |
@Olin I'm using google chrome and I still can't see it - bug alert!!! (more) |
— | almost 4 years ago |
| 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 4 years ago |
| Comment | Post #276225 |
@Olin yes of course. However this isn't a real design and I purposefully tried to be a little extreme with things to explain the theory (still ongoing)..... (more) |
— | almost 4 years ago |
| Comment | Post #276154 |
*which is why they are coming to Codidact to see the canonical answer of "how to buy components"* - then it's not this answer or question. This question and answer is not that directly and it's done this way so as not to name names specifically. Point 6 and point 9 in the answer covers that as far as... (more) |
— | almost 4 years ago |
| Comment | Post #276154 |
I can't go around putting "don't buy from amazon or ebay or aliexpress or bang-good" because they may just begin to hit the mark in terms of being acceptable dealers in EE components. They are not today and show no signs of being reputable for Pro EEs. But let's say I did make a list then what about ... (more) |
— | almost 4 years ago |
| Comment | Post #276154 |
Exactly, so you don't buy from Amazon and you don't buy from amazon because they are not a reputable dealer (as of 2020). They are not a reputable dealer because they can't be trusted to deal in chips and electronic components. That has to be the conclusion. So, you take a trip to Intel and look to s... (more) |
— | almost 4 years ago |
| Comment | Post #276155 |
@Monica - yes, the upload image thing has been fixed by ArtOfCode. See my bottom answer that explains a work around /bodge fix for seeing the edit preview screen. (more) |
— | almost 4 years ago |
| Comment | Post #276154 |
I think you guys are just not thinking this through or just trying to be insincere. If you choose a component then you have looked on the web to find it and, where you find it, you find the data sheet. If the data sheet isn't there you don't use it (or persevere to find one). There is no HOLY reposit... (more) |
— | almost 4 years ago |
| Comment | Post #276166 |
@ArtOfCode - I think I can give more details on the preview pane not working because I've just done something that temporarily fixes it AND it does appear that I have the same issue on meta and Q n A. If I select "edit" then I get the screenshot as I've shown above. If then I use CTRL-mousewheel to z... (more) |
— | almost 4 years ago |