Recent content by dink

With a 10 bit ADC, you are already kinda sitting in the noise floor of your ADC. 4.88 lbs per bit is not very good if you need 5lbs of accuracy. I usually shoot for 10 x precision of what I am trying to measure. I assume the Arduino 10 bit input is a built in ADC input, correct? You may need to...

Remember, your AC/DC adapter is a constant voltage source, not a constant current source. V=IR and all that. Almost all consumer electronic power supplies are constant voltage sources. You will rarely have a constant current source provided in a consumer product.

Thanks for all the responses. I pitched the copper tape idea using kapton tape layers and foil to impedance control, it was shot down as "arts and crafts." 125MHz isn't very fast, but we have a very critical engineering crew. I think I have a solution. Thanks again.

You really need an oscilloscope. Add one part at a time, checking your waveforms with each addition. Isolation transformers are always good because it keeps 240VAC from "electricfying" the case of the converter you are building. 240VAC both leads are typically "hot."

My take on RF in electronic design has always been, if the wavelength of the frequency you are working with is less than 10 times the length of the board/device(s), you should be using impedance matched networks for traces and cabling. Currently I have a problem where the wavelength is the...

I'm looking for a textbook that has an in depth coverage of brushless DC motor physics as well as control theory. -indepth mathematical approach as well as conceptual theory -controller schemes and design fundementals -mathematical study of induced currents on the stator/rotor, and what this...

Instead of trying to harness the wind, harness the heat loss off the fan motor. Use thermals engines like sterling motors to turn tiny generators and trickle charge batteries. You don't get perpetual motion but atleast your system efficiency goes up.

Nice, thanks.

Thanks for the replies guys. I think it is possible since I can't find any outstanding errors in my math or my assumptions.

This is sort of a simple question. In a steady-state semiconductor doped n-type, is it possible for the quasi-Fermi level for the holes (F sub p) to be above the intrinsic level for the conductor (E sub i)? That is, E - F = (negative value)?

Just a follow up incase someone else needed the same solution. Merely expanding the cross product (<P,Q,R> form as \vec{G} ) leaves a vector in differentials that is equal to \vec{F} . From then its just a matter of setting the components equal to each other and knocking off which ever...

http://astron.berkeley.edu/~jrg/ay202/node189.html ? 14.54 gives me the form, such that A = G, but does this mean B = F if I expanded to 14.51?

I'm having a bit of difficulty with this problem: \vec{\nabla} \times \vec{G} = \vec{F} where \vec{\nabla} \cdot \vec{F} = 0 and \vec{F} = <y, z, x> . Find \vec{G} . I'm really at a loss how to solve this. I know the solution must be quick and easy because it was on a quiz. What...

Thanks for the replies, ended up going with swiftech and artic silver. Averaging 60C. As to case fans, I have so many I had to get a 450W Enermax. I have an 80mm in back just under PSU pulling hot air out, two side mounted 80mm's blowing over graphics card and motherboard, and a 120 mm blower...

Thanks for your replies guys, with this simple elightenment begins the blossoming of understanding, and also 5 more homework points. :D