Diode Definition and 555 Threads

When drawing a circuit diagram with a forward bias dioide, is it the "fat" side of the dioide which is on the same side as the "long" side of the battery? Thanks

Hey guys, just thought id clarify what happens when an AC current passes through a diode. Say for instance the wave featured in the link below entered a diode, what would it look like once it leaves the diode? http://www.pcguide.com/ref/power/ext/z_ac.gif

Homework Statement In all physics textbooks, the V-I graph for diode appears like the followings http://211.233.39.205/phpBB2/forum_img/diode/diode-14.gif However, when I conducted the experiment with a 1N4001 diode and 12V-AC, similar graph was found, the the graph seemed to have reflected...

I need to understand how diode-resistor gates work. I've read a lot about what's supposed to happen based on inputs, but I need to see some numbers & analysis to understand what's going on. Where do you start in terms of trying to analyze the following AND gate...

when forward bias of led is increased, the intensity of emitted light increases until it reaches a max after which it starts decreasing again...why? also, in which of the two cases is barrier potential greater, led or pn diode?

Say we have a silcon pn junction (diode) - i.e., a block of p-type on left, attached to a block of n-type semiconductor on right: anode ------[ p | n ]------ cathode Because of diffusion we get a barrier potention at the junction, which makes the n-side/cathode 0.7V higher...

Homework Statement "You are required to design a laboratory experiment to investigate how the current in a diode varies with temperature in the range of -20 to +150 Degree's C" Homework Equations N/A The Attempt at a Solution Perhaps using a freezer for the negative temp's and a...

Can someone explain me what a zener diode does? I don't know what the turn on and breakdown voltage mean, and what forward and reverse biased means. And what the difference between a zener and a normal diode is? Thx very much

Can anyone explain me the mechanism of vacuum diode.Specifically how the electronts which are 'boiled' of the cathode behave

http://img151.imageshack.us/img151/1953/51953732lu5.png In this case, is the reverse breakdown voltage at V = 0V since there is negative voltage?

Homework Statement See attachment Homework Equations We are to assume the voltage drop across diodes is .7v (don't use the diode equation!). The Attempt at a Solution I first was assuming that both diodes were "on". Then my work is as follows: V1 is the voltage directly above diode D1 (the...

Over size diode problem There are two sensitive auxiliary relay in one portion of DC control circuit (relay no.1 & no.2) separated by one semiconductor diode. Two relays (R1, R2), their two run up contacts (C1, C2) and that mentioned diode bridge (D) is located in "H" form. When relay no.1...

Homework Statement This problem is to find the I and V by ideal diode model method (assume there is no voltage drop and resistance within the diode) Homework Equations Just simple Ohm's Law equation The Attempt at a Solution First i assume the diode 2 is open, but i don't know...

Homework Statement Find the peak current in the circuit config: V1 = 15v amplitude, 1khz freq. R = 1.5k Vd = 0.7v Draw the transfer characteristic. http://img341.imageshack.us/img341/9761/picture2ge7.jpg Homework Equations The Attempt at a Solution Transfer Characteristic...

Homework Statement Find the parameters of a piecewise linear model of a diode with the following known values: v_d = 0.7V i_D = 1mA n = 2. Make your model fit at 1mA. Homework Equations They are in the image below, written there. The Attempt at a Solution Here's my...

Good morning lovely people ! As I got some really helpful advice here yesterday i though i'd try it again, hopefully you haven't yet had too much from me (-: So my question is concerning the attached PDF file (Last problem #3) i am asked to find the current I_B in 3a) and 3c) but to my...

Hi everyone, I don't have any homework question but I need help on a different thing: I have to write a lab report on "Semiconductor Diode" ... so if you guys know any useful website that can give me some useful and important information (such as appliactions of semiconductor diode...

Homework Statement A scheme of a diode circuit is attached. The voltages at the inputs A and B are 5V. A. What is the output voltage (=voltage at the black node, Z)? B. What values of resistance would you recommend for the resistor R? 2. The attempt at a solution A. The diodes D1 and...

Hi! What would happen if the resistor in the attached diode OR gate removed (connection with the ground would be preserved)?

Hi! There's a schema of a diode AND gate attached. Could anyone of you, please, explain me why the voltage drop across the D1 diode is so big compared to the voltage drop across the D2 diode? Thanks a lot in advance!

Hi! http://www.phys.uAlberta.ca/~gingrich/phys395/notes/node71.html" 's an electrical network for a diode OR gate. It says there that "[t]he 12 V battery does nothing until the power fails; then it takes over without interruption." I just wonder what electrical circuits (closed loops) are...

I have an interesting question about this circuit... if I were to calculate the voltage from point X to ground... essentially all it is, is voltage across the 4 kilo-ohm resistor because if it went the route of the diode, it would lose an additional 2.7 volts.. so its going to take the better...

I have to utilize a Curve Tracing machine on a 5V Zener Diode for a lab. The curve tracer shows voltage vs. current. The lab asks me to examine the curve and determine whether it is a Silicon or Germanium diode, but I'm wondering...what would be different about the graphs of the two types? Wont...

What type of circuit should one set up in order to induce chaotic outputs? My current research is pointing me towards a diode resonator circuit (resistor, inductor, diode in series) any ideas on that model or improvements from other research?

Hello, In lab the reverse leakage current of 4 different diodes was measured. Then ranked from smallest to biggest. Then we are asked to decide which diode would be most suitable for charging up a capacitor and allowing the capacitor to keep its charge for the longest period of time? I...

i am conducting research in chaotic behavior within diodes, can someone please direct me to the derrivation of the ideal diode equation and more importantly for my research, the calculation required for non linear activity in a diode such as that which occurs when the diode is over-reverse...

Hi, everywhere I look for the equation describing the current of a diode, I get I=I0exp(qvb/nkt-1) n=1 for ideal case. for non-ideal diode you got values between 1-2. in order to calculate n you have the equation: n=1+kt/(2*q*phi) (phi=contact barrier height) anyone knows how to...

Here is my question in the formation of Schottky Diode: "Why does conduction band is lower than the original value in the semiconductor side?" And I think it is lower because the postitve charged donor ions provide a attractive force ,which makes the electrons in semiconductor more easy to...

I'm trying to follow an example in the book that leads into more complicated circuits. Consider a voltage source connected in series to first an ideal diode, and the diode is then connected (in series) to a capacitor. Let the input v_I be a sinusoid with a peak value V_p , and assume the...

Q: In the circut below, I is a dc current and v_s is a sinusoidal signal. capacitors C_1 and C_2 are very large; their function is to couple the signal to and from the diode, but block the dc current from flowing into the signal source or the load (not shown). Use the diode small-signal...

In Zener diodes, what is Rz? Could someone give me an idea how it is modeled, i.e. an equivalent circuit? Thanks.

For a PN junction diode, the total potential across the semiconductor equals the built-in potential minus the applied voltage. Phi = Phi(built-in)-Va(voltage applied) My question is what happens when the Va exceeds the Phi(built-in)? Will the Phi = negative? But how come they always...

http://www.sendspace.com/file/qhojgm can anybody pls show me how to determine numerically the diode current I(D) for t<0 and t>0 thanx

Does anyone have any information on diode failure? I'm interested in knowing how diodes can fail and what happens when they do fail. Specifically, what conditions of a diode will cause it to fail to be a closed circuit either direction criteria (like, become as useful as a wire)?

During the processing of a PN junction diode when the Ptype material and the Ntype material are joined together. The holes tend to diffuse from the Ptype material to the Ntype material and conversly the electrons from the Ntype material diffuse from the ntype material to the ptype material...

hey guys, the topic basically explains it...Can someone please help me out with this question...How does SMPS differ from diode rectification? Thanks jake

Can you guys look at the attached file. I have a sensor hooked up to a plug box. My question is, i am suppose to control the sensor through labview. My question is, how does the diode play a role? I would technically send the commands to the 1st input right? and if i wanted to read data, i could...

Anyone knows where can I find graph(characteristics) of the 1N4148 diode. Is there any website that has large number of different graphs for transistors, diodes ?

i have to draw the c.r.o. display for a diode, is it just the same as for an a.c. input but with the parts that were below the x-axis, intead reflected in the x-axis?

Hello all, I've been tasked with drawing the I-V characteristics of a silicon p-n junction diode and I've managed to do that fine. Now, I've been tasked with showing how this curve will vary with temperature (200-400 deg.c) and by illumination with light of photon energy greater than the...

in the diagram below, the voltmeters are as near to perfect as possible, the cell has negligible internal resistance. the red blob is a conducting diode, and the green blob is non-conducting. the coloured boxes are resistors. in order to work out the current through the red diode, is it ok to...

Hi All, I'm replacing a switch in a piece of equipment. I'm looking at the circuit diagram and the actual circuit, and I notice that the diodes in the circuit aren't wired as they are in the diagram.:smile: The HI signal is dc from 0-1 Volt and LO is ground. Is there going to be any...

A thought experiment: (note that this comes from a student with only amateur experience in solid state physics) suppose you could shortcircuit a pn diode... ie you just link a wire between both ends, or maybe even bend the pn diode in a ring (so you'd have a n-surface between two p-surfaces...

I have been trying to figure how a commuter diode effectively works in a circuit with a coil. I know that once the electric/magnetic field collapses in the coil after the current is cut to it that it induces a current in the opposite direction on the diode, which can only travel one way. But...

Hi Guys! How are u my friends? Well i want to ask u one important thing! Please tell me the way to find out the junction area of a diode Thanks in advance

Hi Guys! My Question is this: Dsign the circuit of the fig: so that Vo= 3V when IL = 0 A AND Vo changes by 40mV per 1mA of load current. the value of R = 4.8Kilo ohms. find the juction area of each diode (assume all four diodes are identical) relative to a diode with 0.7 V drop at 1mA...

Hi Guys: My question is this for the circuit in the 1st fig: sketch the transfer charcteristic "vo" versus "vI" the answer of this question is the 2nd fig. but i want to know that what is the logic behind this sketch or in other words how we can draw such a sketch. Thanks in advance

Can someone please explain what exactly the gain curve of a laser is? Is it exactly the same thing as the natural linewidth of the laser [a graph of intensity vs frequency] or am I off track? I found this graphhttp://www.phys.ksu.edu/perg/vqm/laserweb/Ch-5/C5s1p5.htm that tries to explain...

when it comes to pn junction in diode, p and n are doping semiconductors. if P and N semiconductor are contacting each other, some holes in P and some electron in N are combined. that is, they are recombined. this recombination caused the current, very small. I was wondering that...

http://www.eweek.org/site/DiscoverE/PDFs/middle/First%20you%20see%20it%20Then%20You%20Hear%20It.pdf In my Photonics & Fibre Optics class today, our lecturer showed us a "Modern day photophone" he created for an easy $15 AUD (1AUD = 80US cents) I did not have time to ask him how to make one...