Diodes are semiconductor components made from a P-type and N-type silicon material, that allows current to only flow in one direction.

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Max peak to peak swing across ES without any clipping distortion?

This is an exam problem in which my instructor gave the answers but no work. Any one has an idea of how to solve it;FOM(figure of merit)= 25/125, RL=15 ohms, Rx=250 ohms, r1,r2,vee,vcc, are not given. ...
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3answers
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Analyzing a circuit with diodes

In this circuit: Assuming ideal diodes We have 8 combinations of assumptions. I have proved that 5 of them are wrong. The three remaining assumptions are: All diodes are on. D1 is on, D2 is off, ...
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4answers
164 views

How to calculate Vx in this circuit?

In this circuit: Assuming ideal diodes We are required to calculate VD1, VD2, ID1, and ID2. If I assume that D1 is off and D2 is on which is a wrong assumption (as I think). How I prove that it ...
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6answers
132 views

How to calculate Vo in this circuit?

In this circuit: The diode is an ideal diode The diode is on since V(anode) > V(cathode) and then we replace it by a short circuit. Now, how to calculate Vo when two sources are existed? I = (10 ...
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3answers
310 views

How do I analyze this circuit with diodes?

If diodes in this circuit are ideal diodes: I'm making assumptions to solve this circuit for I and Vo but I have some questions: 1. What is the voltage at the cathode of the upper diode if the ...
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1answer
46 views

How do you determine graded versus abrupt diode junction types?

The problem When a diode is reverse biased with 8V, it has a junction capacitance of 15pF. When the reverse biased is increased to 12V, the capacitance drops to 13.05pF. Find whether it's abrupt or ...
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1answer
45 views

Sedra and Smith Example 3.2

Problem: Assuming that diodes are ideal, find I and V. This is a worked example in the textbook and it says that if you assume both diodes to be conducting then V=0 and VB=0 (nodal voltage at B). ...
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1answer
265 views

Zener diode circuit

When I tried to find current flowing through 1.2k ohm resistor, I am finding 8.33 mA but there comes the problem: I am finding the current through the 1k ohm resistor is 6 mA. What am I doing wrong? ...
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1answer
155 views

Can a photodiode emit light?

I read that an LED (primarily emits light) can also be used as a photodiode (primarily detects light). Is this true in reverse? I mean, can a photodiode also emit light?
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3answers
95 views

Compensating input impedance

I'm trying to measure the reverse leakage current of some diodes with the method proposed HERE - the diode is connected in reverse bias to 5V through 1 megaohm and voltage is measured across the ...
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0answers
46 views

Why does it take several seconds of time for the photodiodes to come out of saturation?

I am currently studying about photodiodes and came across this fact that photodiodes take quite a bit of time to come out of the saturation. What really happens during this time (after it is saturated ...
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2answers
74 views

Design help for my 1A variable power supply

In a 1A Variable Power Supply circuit given below is it possible to use a 2A transformer and 1A bridge diodes.
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1answer
61 views

What diode do I need? [closed]

I have started my own solar powered shed and it's gone from a very small thing, lights only to lights, 12V cigarette lighter socket with USB points and on top of that, as I was generating a bit more ...
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2answers
60 views

Problem with a circuit of an controlled variable voltage source

I have this circuit, it should regulate the output voltage between 15V and 0V. But the output I get when I simulate it is between 2V and 3V, and when I implemented, I burned zener diode 1N4734A. ...
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1answer
50 views

Selecting diodes for HV full bridge rectifier

I'm using a current-fed Royer self resonant circuit to generate 1kV DC output voltage. The transformer is producing a sine wave of 100kHz/2kVpp (Cap-Royer = 100nF). At the output of the transformer I ...
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1answer
70 views

Zener diodes comparison 12V vs 6V2

12V zener diode has the same series as 6V2. It also has same wattage of 500 watt but VZ of 12V. Will it handle the same maximum current IZT as the 6V2? Any proof?
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2answers
348 views

Switching between battery and USB using diode OR logic

I have a Raspberry Pi that is powered by a USB cable from a Samsung charger. Now since my college has frequent power cuts, I designed a basic switch to automatically switch between a portable mobile ...
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4answers
103 views

Anti-wind up scheme in the implementation of PID controller

I want to implement designed PID controller. But I am facing the problem of how to limit the saturation limit in both positive and negative direction? I tried using zener diode, but I would like to ...
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1answer
47 views

Flyback converter current flow?

If you look at the flyback converter circuit above, the current only flows in one of the coils at any instant of time. What stops the magnetic field generated by the coil in series with the MOSFET ...
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2answers
42 views

Meaning of zero load and full load in circuits

This might be straightforward but it has been tough to grasp for me. When a question says to calcualate the power dissipated by the Zener diode under zero load and full load. What exactly does the ...
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3answers
75 views

voltage change inn diodes [closed]

voltage relation diodes of rectification process related to electronics
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1answer
39 views

PSpice OrCAD Adding Diode and Unknown Source

On the PSPice OrCAD, how do you add a diode with a 0.7V forward bias and a unknown voltage source?
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2answers
55 views

Why is the Vbe threshold of a Si NPN transistor 0.7V and not -0.7V?

In case of an n-p-n transistor, the Vbe is more like voltage across a p-n diode. Now, since the direction of electric field in the depletion-region is from n to p, how come the voltage across the p-n ...
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1answer
43 views

Diode equation.Needs understanding [duplicate]

Kindly explain this equation for me.I do not understand what it means and from where this equation comes out?it's a diode equation $$ r^{\prime}_d = \dfrac{26\mathrm{mV}}{I_D} + r_B $$
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2answers
149 views

What are the use of these diodes?

I have a circuit diagram which is for a circuit used for testing batteries under a load, only one of the batteries can be tested at a time and I was just wondering what the point of the diodes in the ...
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2answers
64 views

For the circuit shown, use exponential model of diode to find value of R for which v=80mv

I know how to do this if the diodes were ideal, however here, they aren't. I've tried. Please help out. I've gone this far: log (iL/i1) = (v/vT) i2/i1 = e^3.345 (assuming vT = 25.4mv) i2/i1 = 23.31 ...
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1answer
72 views

Explain the equation [closed]

Explain the following equation... $$ r^{\prime}_d = \dfrac{26\mathrm{mV}}{I_D} + r_B $$ Explain from where and how this equation comes out . Also elaborate the terms used in above mentioned ...
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3answers
116 views

Precision half wave rectifier

How does a precision half wave rectifier work? The one with a single diode. When the input goes positive, the output of the op-amp is a large positive signal which turns on the diode and completes ...
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0answers
24 views

Find the Output curve for the given Input Curve

For the circuit given below find the output wave form for the given input wave. The following are the answer choices for the curve of Vout. The answer choice selected in my book is (3) Please ...
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1answer
48 views

Cutoff and Conducting diodes

Why is D1 considered cutoff and D2 considered conducting ? Note : I am working with constant voltage model where the diode voltage is 0.7v and I need to figure out I and V. Please explain why D1 is ...
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1answer
83 views

What is the purpose of the following configuration of diodes on an RF line?

I've been told that these are disconnect diodes. However, I am unsure as to what purpose they serve. They are used on the line that sends a signal to a piezoelectric, the return signal from the ...
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0answers
35 views

Graph of the output Vo for a given Vi in a diode circuit explanation [duplicate]

We have the following diode circuit: We have found when the diode is on and off. I perfectly understand this. Now the teacher gave an extra question that I don't understand. What is the output ...
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1answer
70 views

Diodes circuit question please help?

We have the exercise in the figure.I understand the answer.Now my question is: Whatis the output going to be if we put an input of V=10sinwt? Can you draw it for me? Not totally accurate,just so I ...
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3answers
192 views

Where to put freewheeling diode in relay circuit?

I am building a circuit to lock/unlock a door using a standard electromagnetic door lock (http://www.amazon.com/Seco-Larm-E-941SA-600-Enforcer-Electromagnetic-Holding/dp/B00196YB5Y) and controlling it ...
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5answers
341 views

Diode circuit with parallel voltage source

What will be voltage V if all diodes are considered ideal simulate this circuit – Schematic created using CircuitLab
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3answers
66 views

Very short question about the circuits in the figure?

We have the circuit in the figure.In my book it says Vo=Vi.Why?
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1answer
70 views

Alternative LEDs Blinking circuit(Analog) Help

Can someone explain the operation of this circuit, I understand the basics of the BJT and its modes, but most of my confusion arises when there is some-sort of feedback loop in the circuit, my thought ...
2
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2answers
91 views

How to modify this circuit for variable clipping without affecting gain?

Below is a basic implementation of a circuit used to clip an incoming signal using the diodes in the feedback loop of the op-amp. Since the diodes are different they have different characteristics, ...
2
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1answer
68 views

Diodes working zone graph explanation?

We have the following diode circuit.We have found when the diode is on and off.Now the teacher gave an extra question.What is the ouput Vo (represented in a graph) when we have an input of a) \$V_i = ...
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2answers
77 views

Understanding a tuner Circuit with a reverse biased diode

This is a circuit extracted from the book "Electronic Circuits Analysis" by Phillip Cotler. simulate this circuit – Schematic created using CircuitLab The potentiometer R1 can be ...
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1answer
68 views

12V UPS power supply and battery [closed]

I'd like to use a Tripp Lite PR40 as a backup 12V UPS by connecting it to a battery before a couple motors in parallel. The battery is 125AH deep cycle AGM. Can I do this? The manual says that the ...
3
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4answers
322 views

Steering Diodes

What are the "steering diodes" next to the pot for? Source: http://www.youtube.com/watch?v=OXsu29K_Ap4
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48 views

Diffusion capacitance

As far as I know, capacitance is created by two conductive plate with an insulation between them as they can store charges. When a diode is in reverse bias, it shows a capacitance because the n and p ...
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4answers
160 views

How do you remove negative voltage from a sin, triangle or square wave?

I need square wave without negative voltage. Considering a source which produces square wave (could be function generator or from other circuits) has no ability or I don’t have the control required ...
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3answers
97 views

Connecting diodes to a motor in H-bridge

I'm attempting to design a three wheeled toy that is controlled by a remote connected with it via a cable. I first designed it with relays, however I had to change to transistors due to contrast ...
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1answer
65 views

ATtiny85 absolute ratings for outputs?

The ATtiny85 datasheet specifies an absolute maximum negative voltage for any pin of -0.5 volts relative to ground. Consider this partial schematic: MOSI and MISO are the respective ATtiny85 pins ...
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4answers
163 views

Cool White LED bulbs: Are they “full-spectrum”?

I don't have much knowledge on LED lights and find the technology quite fascinating (yes, I know, it is not that knew!) I have read that in order to create "white" light, LEDs actually need to emit ...
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1answer
71 views

Why can current flow through the reverse biased base-collector junction (N-P junction) in a BJT with a forward biased base-emitter junction?

If the base-emitter junction of a BJT is forward biased, then current can flow through the reverse biased base-collector junction (N-P junction). This disagrees with my understanding of the PN ...
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2answers
84 views

How do you choose a diode for a 5v to 3.3v clamping circuit

I have a logic input that is 3.3v and I want to be able to allow it to interface with either 3.3v or 5v input signals w/o worrying about it being damaged. I would like to use a resistor with a ...
2
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1answer
77 views

voltage regulators destroyed — protection diode needed?

I have the following basic circuit: As I was flipping the button to turn the relay on and off, I noticed sparking from the voltage meter, and it eventually caught fire, releasing the magic smoke ...