get a good grasp of what antenna is, the types out there, the differences between them. it will help you understand why people build antenna and use different antennas in different application as well as drawbacks. once you understand this, it will make more sense to build one.
there are 3 types of rfid, passive, semi-active and active. Passive rfid harvest the energy from the coil so it only works when it is close to detect the energy (inches). You will need active rfid. Try digikey.
there's a reader from atmel u2270B, add that with a controller and a tag to read.
capacitance has inductance as well. its generally Ceff = C + L//C or some other combination. As frequency increases, impedance drops, and once it gets beyond a point where inductance is dominant over capacitance, impedance goes up.
ok, so mainly the difference is voltage level, and as long you meet the requirements to toggle the gate it should work. One more thing, aren't all chips these days made CMOS, because its lower power consumption than TTL? How do i know if a chip is TTL or when to use 'T' type package?
Berkeman, what is the main difference between ttl compatible and cmos compatible?
A 'non t' part has the conventional cmos input threshold, while ones with 't' has both cmos and ttl compatibility. Does that mean if i use a 't' part it wont drive a 'non t' part? I thought as long as it meets the...
capacitance in parallel is same as resistor in series and vice versa.
c = permittivity*dielectric*area/distance
If you have a sphere, it will be an integration of series of capacitance depending on the diameter of the sphere at different location. At the tip of the sphere, the dielectric...
the electrician already explained. its called natural log. In your calculator natural log.
Its not 'In', the symbol is Ln, or some people write L as 'l', and unfortunately 'l' looks like 'I'
It would be best if you draw a simple circuit, with voltage and 1 resistor. What is the current? What happens if you add 2 resistor in series now. What is the current and voltage between both resistor. Keep adding, another resistor in parallel with 2 resistor in series and find...
you can make current go any way you want as long as you stick to the same convention throughout the circuit (this is just something to keep in mind)
In this case, you have 3 lines in your circuit with respect to that node. Current is not pointing up. That is just a symbol for current. It says...
Like the title says, if you have a bunch of data you can create a best fit line
For example back in school, for a linear line, y = mx + c, you just need 2 points to get a line. But what if you have more than 2 points, say 10, what is the best fit line equation or how do you do it...
images on checkboard like black-white-black-white-black-white.....
are you changing the size of the sequence image on the checkboard? or when you say focus image then the center looks focus and the sides look a bit blur? If you could post some image it would help
What does a higher index of refraction really mean? I know about speed wavelength etc but lets say you have 2 different material to choose and ignoring other variables, and focal length, diameter are all the same between both material, would you choose a lower index refraction or higher.
do you have multiple element lens and moving the distance of 1 lens to change the focal length?
This may be helpful. Check the resolution of the pixels, FOV of interest etc
why does the spot size increase with lower f#.
Lets says you have 2 lens of the same material, and diameter, just different focal length. F/2 has higher spot size than F/3 but F/2 is faster. Is spot size a characteristic of a lens? So if your detector is fixed in size you need to get a lens...