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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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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64 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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306 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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2answers
70 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
39 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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32 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
66 views

voltage change inn diodes [closed]

voltage relation diodes of rectification process related to electronics
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1answer
28 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
52 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
38 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
141 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
57 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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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
92 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
23 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
40 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
74 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
51 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
169 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
249 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
64 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
69 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 ...
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2answers
78 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, ...
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1answer
65 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
74 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
57 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 ...
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318 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
147 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
77 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
59 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
145 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
66 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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76 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 ...
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1answer
71 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 ...
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1answer
53 views

SMD diodes identification

I'm trying to identify the SMD components on a contactor control circuit. They are from General Semiconductors and have the labels: YR103, WX104, and RZ102. I think they are diodes, but I'm not sure ...
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104 views

How ICBO gets amplified to ICEO in BJT when base is open

I have been doing some reading about ICEO and ICBO, but couldn't really understand how ICBO is getting amplified (1+ beta) times to reach ICEO, in the open base condition. This is my understanding ...
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ICEO, ICBO physical interpretation in BJT

I am stuck with the equation: ICEO = (1+β) ICBO My questions are: What is the physical interpretation of this equation? Will both the currents exist simultaneously? Are any of the reverse currents ...
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287 views

Why is there so much overshoot in my LED circuit and how do I prevent it?

I'm trying to PWM a 5 meter RGB LED strip with a microcontroller. With this setup: simulate this circuit – Schematic created using CircuitLab I have built it on a breadboard and probed ...
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116 views

How much power/intensity IR Diode should have to be seen from 30-50 meters

How much power/intensity IR Diode should have to be seen from 30-50 meters by camera with IR pass filter? Must be a good point in a photo. Should be seen in a day light. Preferably with wide angle. ...
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59 views

Single Phase Diode Bridge Rectifier - Inductive Smoothing Question

So I don't understand how the answer is 2.124 volt-seconds when if you put the equation through a calculator it comes out as -0.174. Is there an additional mathematical step to do on the cosines in ...
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1answer
95 views

A small circuit with two diodes

We have circuit like this: There's no internal resisters in batteries. Is \$\frac{I}{J}\$ equal to zero? If it is nonzero what is the voltage between the ends of the lamp (assuming the lamp has ...
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1answer
85 views

Diodes and CMOS 4060 (14-stage counter)

Take a look at this popular circuit for a fridge alarm based around the 4060 binary counter (http://free-electroniccircuit.blogspot.co.uk/2012/02/refrigerator-alarm-schematic.html): One thing I ...
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121 views

How does a Schottky diode work?

There are no spare positive/negative charge carriers on the metal side of the diode, so the spare positive/negative charge carriers on the semiconductor side can not diffuse into the metal and ...
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2k views

Why do some diodes have a glass package?

Put simply, why do some diodes such as most Zeners and Schottky diodes have a glass package as opposed to the more traditional plastic package? Is it ease of manufacturing, thermal properties, or ...
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2answers
164 views

Make a zener diode out of a MOSFET

Does anyone know if its possible to wire up a MOSFET transistor as a zener diode? I have been happily making normal diodes from my MOSFETs by shorting the gate and the source simulate this ...
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93 views

Diode rectification on a device

I have a Peltier (TEC) module, with diodes in series with each lead. (see image below) I'm not quite sure what the specs are for the diode, but it says 130 on one line and SB560 on another, so I ...
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95 views

Laser diode M140 current driver

I am trying to build a driver for my M140 laser diode. I made a circuit following a guide. Then I made a test load. When I change the pot value to the minimum I get a maximum current of <100mA on ...
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Can an operational amplifier circuit be made entirely out of diode Nand and Nor gates?

I'm not sure whether this question has been asked before, but in researching my question, I came across this user's post (at If-else decision structure using op amps or any other non-programmable ...