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Just some clarifications for you to get a clearer picture.
LEDs are a type of diode, and diodes dont have resistances unlike resistors. The function of an ideal diode is very simple, it allows current to flow only in one direction. The key thing is that it allows ANY amount of current to flow...
Re: NO!
I was reading from this quote. He was not very clear, but my interpretation is that he doesnt want to use an RS232 scanner because it's more expensive than a usb one.
Another indication that the scanner is a usb one.
These are just interpretation issues, but I just wanted to give...
If you are implying you want a PIC that is capable of communicating with a usb scanner (with no other IC required), then I can safely say that it's definitely impossible.
Fourier series states that all signals can be represented as sums of sinusoids.
x(t) = A sin (wt + p)
If phase p is linear,
p=aw
Then
x(t) = A sin (w(t+a))
= A sin (wT)
where T = t+a
The importance is that no matter how many sinusoids your signals contain, all of them get...
Most memory card readers use specially designed ICs that handle all these in hardware logic. You can always use a PIC and implement the protocols in software. In that case, there is nothing much to include on the schematics other than the pic itself, and try to use a low-voltage version as most...
I once remembered this simple experiment that my prof did. He placed a transistor radio into a meshed cage and reception dropped to nothing almost immediately. Stick a metal rod through the mesh (not touching the radio or mesh) and reception returned. A simple yet interesting experiment on...
There are 2 main methods for getting negative regulated voltage. You either supply a negatve unregulated voltage (with additional negative voltage clearance for dropout), as others have mentioned, or you use dc-to-dc convertors, which are based on oscillators. The second method is mainly for low...
zevon8 has the closest answer. It's called impedence matching. Reactance is an increasing function of frequency. At high frequencies and denser layouts, pcb traces possess significant impedances and turn into circuit elements. (Recall that a capacitor is simply 2 conductors seperated by a...
dlls stand for Dynamically Linked Libraries.
Library - Shared functions
Dynamically-Linked - Loaded only at runtime. This reduces program file sizes, memory required, and allows programs to "share" a common library. Any changes required need to be made only to the library, instead of updating...
I've read numerous articles on how grounding in mixed signal PCBs should be handled, and I've observed the following 3 camps.
1. Solid ground with split power plane or power traces.
2. Split digital/analog ground plane, with star-point at power supply.
3. Split digital/analog ground plane...
Just take a look at the modules offered by your university. Electrical/Electronic engineering is a much wider field than what you may expect. Over here, all of those you have mentioned above are covered in merely 2-3 modules. So in actual fact, your "edge" may not be a lot after all.
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