Activity for Andy aka
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #285242 |
Why does your diagram have time accumulating from right to left. This is very unconventional and I would be cautious about posting a picture that shows it like this. Maybe it came from a web site that's a little flaky?
You said this: `Assume now that the bandwidth of the signal is 2kHz.If the band... (more) |
— | over 2 years ago |
| Comment | Post #285198 |
A zener barrier in the so-called "safe area" will still require 3 zeners if it feeds equipment that is contained in a Zone 0 environment. Ditto if the zeners are mounted in a Zone 1 or 2 area (UK/EU regulations are what I'm referring to because I think NA regulations don't always recognize a zone 0 s... (more) |
— | over 2 years ago |
| Comment | Post #285201 |
All zener barriers must have a fuse to protect the zeners. If you don't need much output current maybe 100 mA will do but, it has to be a fuse that is line/phase voltage rated (i.e. 250 volts) and, it has to have high rupture current (4,000 amps from a long ago and fading memory) (more) |
— | over 2 years ago |
| Comment | Post #285201 |
The fuse, in all zener barriers is never optional. The output resistors Olin shows suffice as current limiters. (more) |
— | over 2 years ago |
| Comment | Post #284955 |
Energy does propagate. If it didn't propagate then how would we ever hope to see the light of our sun. It propagates entirely on it's own and then, when that light (EM wave) hits something that can make use of it, then, that energy is partially or completely used or reflected. (more) |
— | over 2 years ago |
| Comment | Post #285070 |
Why do you say convert triple phase to single phase when this is contradicted by only having two of the three hots available. Please fix this. It's a big deal. (more) |
— | over 2 years ago |
| Comment | Post #279876 |
Show your interface circuit up to the first line of chips. (more) |
— | over 2 years ago |
| Comment | Post #282671 |
When it is critically damped, there is not oscillation. (more) |
— | over 2 years ago |
| Comment | Post #284514 |
There is no input shown and no output shown and, with the component values you have shown, the BJT might just as well be removed entirely. (more) |
— | over 2 years ago |
| Comment | Post #284282 |
Let's **not** start with assuming *that torque vs. rpm of the load is linear.* (for extremely good and sensible reasons). Your follow-up question makes no sense either. (more) |
— | over 2 years ago |
| Comment | Post #284074 |
Do you mean C2? (more) |
— | over 2 years ago |
| Comment | Post #283960 |
Sorry but that's garbage. (more) |
— | over 2 years ago |
| Comment | Post #283960 |
*Now current entering one coil marked with a dot, produces a current exiting the couple coil at its dotting end.* - this is incorrect. Induction causes a voltage to be induced. Think about it - how can a current be generated by L2 in the opposite direction to that flowing in L1 when they are in serie... (more) |
— | over 2 years ago |
| Comment | Post #283430 |
A signal that cannot change is generally recognized as being 0 volts. (more) |
— | over 2 years ago |
| Comment | Post #282733 |
Where did you uncover the equation? What document did it come from? (more) |
— | almost 3 years ago |
| Comment | Post #282738 |
Why should we be able to transmit power from an antenna billions of miles? What transports this power? You need to study EM field radiation. That's a far bigger issue than a wires apparently being an open-circuit. (more) |
— | almost 3 years ago |
| Comment | Post #282746 |
If you leave your name, address and utility company reference, I'll contact them on your behalf and arrange for you to go on a low-tariff supply. (more) |
— | almost 3 years ago |
| Comment | Post #281971 |
EMI could do that. Maybe make an antenna that works in a close but quiet part of the spectrum and test? (more) |
— | almost 3 years ago |
| Comment | Post #281967 |
Pick several and fit them all to cover as many variations as you think are required. Also fit inverting links so that a barrel jack with the centre pin with opposite polarity can be reversed. Or use a bridge rectifier to automatically produce the correct polarity.
(more) |
— | almost 3 years ago |
| Comment | Post #281634 |
@2kind ESR is very important. If the ripple current is high such as in inductive chargers using resonance then the ESR can dissipate enough heat to burn a capacitor. Plenty of other applications require low ESR. (more) |
— | about 3 years ago |
| Comment | Post #281165 |
Yeah I think the 10 nH is a tad high compared to the real true value needed (8.7 nH) (more) |
— | about 3 years ago |
| Comment | Post #281165 |
You didn't say what calculator you used or what values it came up with. (more) |
— | about 3 years ago |
| Comment | Post #281226 |
Good result Leroy (more) |
— | about 3 years ago |
| Comment | Post #281165 |
Regards LoRa, I can't answer that so maybe address it to the OP. (more) |
— | about 3 years ago |
| Comment | Post #281165 |
@Lundin trying to target a specific frequency with a notch filter is haphazard and relies on low drift components. Having said that, you can add a capacitor across the inductor in the PI filter and get an elliptic (Cauer) filter that does do that (but at the expense of not being great if the bandwidt... (more) |
— | about 3 years ago |
| Comment | Post #281165 |
@Lundin a PI filter is the archetypal impedance matching network to turn to. The fact that it can have seriously good attenuation characteristics outside the pass band is a major bonus. Usage of PI filters in reduction of EMC isn't really using them as a proper (intended) circuit but just as a bidire... (more) |
— | about 3 years ago |
| Comment | Post #281165 |
... If you look at the link to the calculator in my answer and scroll down I've made a [5 stage](http://www.stades.co.uk/Impedance%20TX/Simulations/PI%20cascaded.png) filter and that has a monstrous and slope [here](http://www.stades.co.uk/Impedance%20TX/Simulations/PI%20cascaded%20simulation.png). ... (more) |
— | about 3 years ago |
| Comment | Post #281165 |
@Lundin if the simpler pi filter provides enough attenuation then no need to go to a more sophisticated filter. However, you can absolutely stack end-to-end pi filters to get both impedance matching and steeper roll-off..... (more) |
— | about 3 years ago |
| Comment | Post #281064 |
What are you trying to achieve with your modulated signal? OOK? Non-suppressed carrier? Suppressed carrier? You need to be clear about your goals. 555 timers are normally suited for anything but basic modulation schemes. (more) |
— | about 3 years ago |
| Comment | Post #281059 |
Have you tried looking for wide bandwidth unity gain stable op-amps? (more) |
— | about 3 years ago |
| Comment | Post #281021 |
*Can there be a global EMP disaster* - I'm sure there could be one day (more) |
— | about 3 years ago |
| Comment | Post #280791 |
24 volts is probably used more often than 28 volts and quite possibly 72 volts is more common than 60 volts. 15 volts is also commonly used. (more) |
— | over 3 years ago |
| Comment | Post #280600 |
Use a simulator. Really, use a simulator. If you are not able to use a simulator let me give you some very, very good and strong advice: Get a simulator and learn how to use it. (more) |
— | over 3 years ago |
| 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 |
| 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 |
| Comment | Post #279987 |
@Lundin - is it 7 that is the maximum? Was my memory finally letting me down !! (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 |
| 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 |