Recent content by hayowazzup

Hello, I am currently working on a PCB design project, just wondering if anybody knows how to reduce the size of the gap(the black circular region) around individual pin of IC Chips (after I have done the polygon pour) so that a 0.5mm ground track can get through. In addition, what is the...

thanks a lot for the replies above. I really appreciate it. by the way, I have a question that's unrelated to the topic. Is it possible to bias the bjt so that the output voltage can have a voltage gain of 20 (2V peak to peak AC) from a 100mV p-p signal ? I tried changing the resistors value...

This is actually the circuit I am working on http://img96.imageshack.us/img96/8237/bjt1.jpg I've chosen the first two peaks to measure. P-P voltage 2.58 - (-1.207) = 3.845mV so 3.845 = (R/(1000+R) * 100 => R = 39.9875 Ohms...

I have tried it with voltage divider rule but when I put the Rin value back at the resistor it measures 0.64 of the voltage source, is that normal?

So I guess by putting 1k in series then I could just measure the Vin p-p and use the voltage divider rule to solve for Rin?hmm I tried it but it doesn't seem to work.

I just tried it on Ltspice but there's something I still dun understand ..does this have to be done in ac analysis with ac amplitude? And also will this method also work on circuits such as oscillator,opamp etc?

Does anyone know how to measure the input and output impedance of a bjt circuit on Ltspice? eg. a circuit like this

Homework Statement A beam of α particles with energy/particle = 2.86 MeV is directed towards lead foil. What is the speed of the α particles? Homework Equations E = 1/2 mv^2 v = SQRT(2E/m) v = SQRT((2)(2.86E+6)(1.602E-19) / (1.673E-27) ) = 23403526 m/s = 0.078c but the ans is 0.039c...

oh i get it n1/p + n2/q = (n2 - n1)/R Putting p = infinity, q=f => n2/f = (n2-n1) /R R = f(n2-n1)/ n2 R = 35(1.33-1)/1.33 = 8.68mm

ok I just did a guess θ = 25 / 2 = 12.5 but why?

Homework Statement Radium-226 decays with a half-life of 1.60E3 years via the process: Ra -> Rn + He + Energy (Masses : Ra = 226.025403u, Rn = 222.017570u, He - 4.002603u) How much energy, in MeV, is released in each decay? Homework Equations E= mc^2 The Attempt at a...

Φ = 180 - 2θ θ = (180-Φ)/2 = (180-25)/2 = 77.5 2dsinθ = nλ λ = 2dsinθ = 2(0.1E-10)sin(77.5) = 1.95E-11m λ = h/p λ = h/√(2mE) E = (h/λ)^2 / 2m E = (6.63E-34 / 1.95E-11)^2 / 2(1.67E-27) = 3.46E-19 J E = 3.46E-19 J/ eV = 2.16eV ?

Use I use this equation to do it? 1/f = (n-1)(1/R1 - 1/R2)

Homework Statement A mono-energetic beam are of neutrons is directed perpendiculary at the surface of a metal crystal whose atom are a constant distance 0.1E-10m apart. The scattered beam of neutrons is found to have maximum intensity at an angle of 25degree to the initial direction. What is...

Homework Statement Parellel light in air enters a transparent medium of refractive index 1.33 and is focussed 35 mm behind the surface.Calculate the radius of curvature of the surface of the medium. Homework Equations Can someone help me with this question , i have no idea where to start...