I managed to get an OS-1838B IR detector, so no longer need to figure out what the mystery device is exactly. But I still want to!
I compared the output waveform of the 1838B IR detector with that of the unknown element, when they are excited with a TV remote control signal. I get the...
Thanks, fellow sleuths. A photodiode seems likely, although the pinout still confuses me. Perhaps a phototransistor, where the base should be left floating?
An excellent rule! I think I'll adopt this. This should have been my approach from the beginning, but since I can't just buy components...
Hello!
I found this circuit element below in a drawer marked "IR detectors" (which I must have written on it myself, a long time ago...although I must admit don't remember doing so #OldAge).
First of all, I'm trying to figure out what, exactly, it is. My initial assumption was that it looks...
I have looked into this. It doesn't seem like a possibility anywhere near where I live. There's no evening universtiy classes in mathematics for the purpose of obtaining a degree in the country, as far as I can tell!
Thanks for the advice. I am considering a one-year postdoc position at the...
So, as the title says, I'm considering doing a second undergraduate degree having recently completed my PhD. I've searched for advice on this online and I can't see anyone else who has asked this before, which hasn't made my decision any easier.
My educational background is an undergraduate...
Non-homogeneous secx eh? :P
You could always try a Power Series solution if you expand the sec(x) in a power series:
http://en.wikipedia.org/wiki/Power_series_solution_of_differential_equations
Yes, I suspect this may the approach the question is designed to test. But, of course, Carnson's Rule only gives about 98% of the bandwidth - there's no indication in the question that this is enough.
That's actually the instantaneous phase, not the frequency. To get the instantaneous...
1) Measure the actual resistance of the "220 ohm" resistor.
2) Check the accuracy of the meter (use another meter - digital might be better as it would probably change the circuit less than and analgoue one)
The question is really weird! First of all, sampling is generally defined for signals that exist for all time, yet you're told you only care about signals between t_o and t_f . Also, sampling is usually based on Fourier theory, but this signal doesn't have a Fourier transform if you're...
Yep, that's it - as the energy of the electrons increases the probability of finding some at higher energy also increases, and in particular the energy level at which the probabilty of find an electron is 0.5 i.e. the Fermi level, will rise up from somewhere near the middle of the bandgap in an...
The Fermi-Dirac distribution gives us the probabilty that, should there exist a quantum state at a particular energy level, we find an electron occupying that state. It is the "probabilty of occupation" of an available energy level. To get the total number of electrons per unit volume, in a...
Seems useful to me. It'd be hard to have enough applied maths courses. Pertubation theory appears in many areas, if you get into the quantum side things it would be quite useful there. Hamiltonian stuff is useful for quantum too, and Laplace, special functions and Sturm-Liouville theory is...
A good book by all accounts (I haven't read it yet myself) is this: Quaternions and Rotation Sequences. It may be a bit too advanced at the moment. Keep it for later reference maybe, something to work toward!
Hi Sara, I came across this article on computing pi recently. It might be of use in general for implementing variable precision commands in matlab.
http://www.mathworks.co.uk/company/newsletters/articles/clevescorner-computing-pi.html