Cheers for the detailed explanation BoB
Yeah, that is what I meant by setting the period with the pot and cap on the 555 comparator inputs. I would prefer a controller that gave me both period and duty control, and was wondering if your suggested device offers that (I haven't got around to...
Can't see this one mentioned:
Magnetic trays. The kind auto-mechanics use. Annoying when you brush a bunch of carefully laid out screws everywhere, and you wanted them to go back into the holes they came out of. I prefer pushing screws into foam, but trays are useful when working in awkward...
Thanks for your reply BoB, I will check out the drivers.
I can set PWM period with the pot and cap on the trigger/threshold input of the 555. 1 second with half-waves gives me 100 points of resolution at 50 Hz. Unless you mean that I can vary the period without altering the circuit, which would...
Thinking of a circuit to control the AC power to a heating element. I wanted something fairly linear, and analog. I don't have anything against using a programmable controller, I just wanted to think of an analogue solution, seeing as I don't need to learn how to write a program.
I'm afraid you would have a better understanding of it than I would. I don't actually know anything about the physics of photovoltaics.
My grid suggestion would only give a reasonable answer if the resistance of Rv and Rh were both significantly higher than the junction resistance, and whether...
Ahh, thank you
Looks like the thing lacking from my understanding in this case is the derivation of series expansions of functions. Right now is the first time I have read the formal definition of the Taylor expansion of a function. I have used expansions to solve problems, and I'm fine using...
Thank you for the help, I'm mostly there, I can now solve R(t) for a given T(t). I was not interested in that sine function per se, it was just a simple bounded continuously changing function that I could use for R to follow on a graph.
What I'm still unclear about, is this part:
How did k...
I realise I can pretend so to speak, the graphs illustrate that.
I want the actual continuous function though (not because I need it, but because I'm curious), and I'm having a brain lapse. I was hoping someone could point me in the direction of what to look up.
I am basically looking to do...
Never done a problem like this, but here's my thoughts
The mesh is basically a rectangular grid of individual resistors, from which the extremities (apart from that at B2) can be ignored. I am also assuming there is no electrical connection between the three busbar ends beyond the final finger...
A few things:
Voltage polarity is due to potential difference.
Your equations don't seem to be loop (mesh) equations.
The direction to assign a current for analysis is arbitrary, as long as you don't swap it's direction mid analysis. If you guessed the correct direction, the result will be...
My question: Can I turn this difference equation for R below, into a continuous function R(t)? I have no idea if, or how, I can. And I'd like to.
Equation derived from the following manufacturer statement on the thermal response of a thermistor to a fixed temperature:
I forgot to stress it is the silver I am most interested in, because I can't find information on it either, whereas gold and copper information (anecdotally at least) seems much more available.
Reason I ask is for fashioning custom soldering heads. I want to know how silver behaves...
My question relates to electronics soldering, where the main metal in the solder is Sn, with small amounts of Ag and/or Cu
If a rod of Cu, Ag, or Au is placed in molten Sn, which of the rods would melt away fastest?
Is there a threshold temperature up to which the solid metals won't...
The way to select the right example is by first asking the questioner about themselves and their lives. If people want a one-size-fits-all answer, well whoever comes up with one will make an absolute fortune in education.
Yes, but is the question "why do you pursue knowledge?" or "what does that knowledge end up used for?"
It doesn't matter that there is no existing use for something, or that one can't be thought of. The fact people are building it means it exists as a tool.
You told me it is wrong, yes, but I'm not agreeing with you. With logic, sorry, I was thinking of programming logic, which is very simple.
Part of set theory is being used eh? Wow, so it is a tool after all, even if all the applications haven't been figured out yet
But it isn't different at all.
Engineer has a problem, uses the relevant mathematics to solve it.
I mean, no wonder laypeople are having difficulty understanding it, if people are over complicating it with their philosophical pursuits!
I thought the question is the general public asking what the practical use is?
But I also honestly don't see it as anything other than a toolbox. Why do people use mathematics if not to solve problems?
The pursuit of it, well, that is another matter.
Then the problem is your ability to communicate with less educated people, because it isn't hard. You're not putting yourself in their shoes.
If they are asking you to explain how the mathematics works, that is a different story.
A quick search for solving 5th degree polynomials brought me to the Quintic function page on wiki, where it says the impossibility was proven by the Abel–Ruffini theorem at the beginning of the 19th century
That is why i put it in terms of craftsmen
People might not be engineers or scientists, but pretty much every adult uses some kind of tools in their day to day life, so they know how to appreciate a good toolmaker. And they can also appreciate that scientists and engineers do important stuff...