Recent content by foobag

Hey guys I have a few questions to ask: 1.) Why are materials whose yield stresses are highly strain-rate dependent more susceptible to brittle fractures than those materials whose yield stresses do not exhibit marked strain-rate dependence? 2.) How would you define 'toughness' in the case...

so I think I should clarify that f_2 would be (A = 2, or gain equal to 2?) so in a bode plot with log f vs log A, the more integrators/low pass filters added would make the line much more steeper am I correct? Thus for a single LPF (low pass filter), if F_o = 1000 Hz, then F_2 = 500 Hz at (Av...

well so were my equations to solve for ripple close? my understanding is I need to find the current running through the capacitor am I correct?

Hi Guys. I have a question on the behavior of active filters (low/high/band) that are connected serially in multiple order magnitude. For instance given 2 low pass filters. Now I understand there exists a -6dB/octave cutoff, and generally f_o or the -3dB value is situated at the...

http://img683.imageshack.us/img683/5329/unledtw.png So its basically a power supply with a voltage regulator LM317T at the end. The question asked to find the voltage ripple across the capacitor. So I basically solved the peak voltage found which would be 12V * SQRT(2) = 17 volts...

ah ok, thank you for your help!

http://img684.imageshack.us/img684/8362/opamp2.png Lets say we are given a non-inverting Op-Amp The gain of this circuit would be A = 1 + (R1+R2)/R3 if the switch is off. What happens when the switch is turned on? It shorts the R1 and R2 resistors am I correct? Does this mean that R1...

ok so a resolution of 0.008 volts would still be an acceptable answer?

i am a bit confused how you arrived at +/- 0.004 volts. I understand 1 part in 128 resolution, but converting that scale back to 1 volt full scale I am getting: +/- 0.0078 volts.

I have a question about digital to analog converters. Lets say I am given a R-2R ladder type DAC with 7 "wrungs". This implies that I have 2^7 = 128 bits. Now if I want to represent an equivalent decimal resolution of that DAC, how do I go about doing that? Let's say the input...

any insight?

I caught an error for part B, i shouldve used the current running through D0 only, so recalculating gives me Vout = 0.00781 volts for D = 0000001. for part c, I understand there are 2^7 = 128 bits possible. To calculate the decimal resolution would it just be 1volt/128 bits = 0.00781 volt/bit...

http://img851.imageshack.us/img851/2991/captureyd.jpg To start off, I understand that I can compute the current flowing through each of the ladder rungs, as I = Vin/((2^n)*100k), where n is the terminal ladder interested in. Doing so, I solved part a of the question for when the digital...

ah so if Vcc varies a lot, than the current I(ZD) through the resistor source won't be as steady as using the current mirror source for I(ZD), basically because of Ohm's Law (R = V/I)? the extra info they gave about the T4&T5 having Vbe (base-emitter) as 0.7Volts and beta >100, do they have...

thanks for your feedback, i really appreciate it!