Activity for Andy aka
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #280450 |
**Are there any considerations from electrical perspective, such as safety regulations** - I don't think safety is a consideration if the object of the exercise is to shuffle off someone's mortal coil. (more) |
— | over 3 years ago |
| Comment | Post #280394 |
If you want me to comment on your proposal, a schematic will be needed @Lundin. (more) |
— | over 3 years ago |
| Edit | Post #280394 |
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— | over 3 years ago |
| Edit | Post #280394 |
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— | over 3 years ago |
| Edit | Post #280394 |
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— | over 3 years ago |
| Edit | Post #280394 | Initial revision | — | over 3 years ago |
| Answer | — |
A: What should be considered when picking a flyback diode? > a coil with plain on/off functionality, for example a 24VDC relay coil with 700mW max coil power. That means a coil current of 0.7 watts / 24 volts = 30 mA. A relay might have a coil inductance of anything from 1 henry upwards but this can be estimated by the relay activation time in the... (more) |
— | over 3 years ago |
| Comment | Post #280327 |
Don't forget to wear your mask. (more) |
— | over 3 years ago |
| Comment | Post #280327 |
Just a guess but in your lower picture (ignoring the detail immediately at the support pole and looking a little to the right), it looks like the lower cable might physically swap places with the upper cable in order to get the same induction from the power cables and thus cancel out differential ind... (more) |
— | over 3 years ago |
| Comment | Post #280040 |
@Joel - thanks for the info. (more) |
— | over 3 years ago |
| Edit | Post #280040 | Initial revision | — | over 3 years ago |
| Question | — |
User's reputation score not displaying on top ribbon It appears that a user's reputation score has disappeared from the top ribbon at the side of the user's login avatar/picture. Is this an intentional thing? (more) |
— | over 3 years ago |
| Comment | Post #279987 |
@Lundin - is it 7 that is the maximum? Was my memory finally letting me down !! (more) |
— | over 3 years ago |
| Edit | Post #279987 |
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— | over 3 years ago |
| Edit | Post #279987 | Initial revision | — | over 3 years ago |
| Answer | — |
A: CAN Bus - Internal Oscillator CAN is asynchronous and, if you receive a string of consecutive zeros, the UART mechanism that turns raw CAN data into "a byte" might have to wait a great deal longer than 1 bit of data before it can re-sync. If data is coming 101010101010 then that's great but, if data is 010000000010 then you ha... (more) |
— | over 3 years ago |
| Comment | Post #279961 |
@2kind - if that is all you have on your secondary then the 700 mA applies when charging the capacitor. But, bear in mind that I don't want you responding with another variant of what load might be connected for me to have to make another comment because where would this process stop? (more) |
— | over 3 years ago |
| Comment | Post #279962 |
@z3333 it all depends on the actual ADC device - I'm just throwing into the ring an easy option that works for most ADCs. (more) |
— | over 3 years ago |
| Comment | Post #279961 |
@2kind - What capacitor? What pulse? I know nothing about your target circuit and, to answer your question, I didn't need that information. (more) |
— | over 3 years ago |
| Edit | Post #279961 |
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— | over 3 years ago |
| Edit | Post #279961 |
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— | over 3 years ago |
| Edit | Post #279962 |
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— | over 3 years ago |
| Edit | Post #279962 | Initial revision | — | over 3 years ago |
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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) |
— | over 3 years ago |
| Edit | Post #279961 | Initial revision | — | over 3 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) |
— | over 3 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) |
— | over 3 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) |
— | over 3 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) |
— | over 3 years ago |
| Comment | Post #279728 |
Superior architecture: you don't need two series MOSFETs. What made you think you did? (more) |
— | over 3 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) |
— | over 3 years ago |
| Comment | Post #279600 |
Do you know how a successive approximation ADC works? (more) |
— | over 3 years ago |
| Comment | Post #279602 |
I also agree with @Olin on this particular question. (more) |
— | over 3 years ago |
| Comment | Post #279554 |
@mithical yes there are. (more) |
— | over 3 years ago |
| 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 |
| 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) |
— | 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 |
| Edit | Post #279227 | Initial revision | — | over 3 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) |
— | 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 |
| Edit | Post #278519 |
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— | over 3 years ago |
| Edit | Post #278519 | Initial revision | — | over 3 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) |
— | over 3 years ago |
| Comment | Post #278475 |
Ground = fiction usually means poor o-scope probing. (more) |
— | over 3 years ago |