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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What will be the value of Vo

simulate this circuit – Schematic created using CircuitLab This ckt comes as a question in our previous year exam. what will be current " I " and voltage drop " Vo " . It'll be very ...
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3answers
85 views

Full-bridge rectifier not working as expected

Im trying to create a full bridge rectifier from a step-down voltage source. The circuit is as follows: simulate this circuit – Schematic created using CircuitLab The problem is that I'm ...
17
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3answers
962 views

Why isn't there a potential difference across a disconnected diode?

I know this question sounds silly, as if there was a potential difference a current would be created when the terminals are connected together and this would mean energy has come from somewhere. The ...
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0answers
49 views

Calculate the voltage needed for the diod? [closed]

The reverse saturation current of one PN diode with T = 350K is 5pA. The series resistance of the P and N regions of the diode are 2 and 10 Ω, respectively. What forward voltage do we need to ...
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1answer
21 views

ICSwitching between solar panel and batteries

I would like to charge the NiMH batteries, when there is excess power from the solar power and use the power stored in the batteries, when I need it (to drive a motor and at night). I have the ...
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2answers
293 views

Diodes,when will it be undefined

So, As I am studying I keeping finding confusions in my concept of Diodes. Sorry if the question is too noobish. So in plotting the Vout with respect to Iin, my manual says that using the constant ...
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3answers
56 views

Diode circuit I/V plot

simulate this circuit – Schematic created using CircuitLab Hi, I have started studying diodes and In one of the exercises of my book, I have faced a problem.The exercise wants a i/v ...
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23 views

drift and diffusion

My question is about drift and diffusion current.In a semiconductor diode no "bias" condition diffusion is present and due to transfer of charges due to diffusion depletion region created and then ...
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2answers
73 views

1N34 / 1N270 obsolete

When I search for 1N34 on Mouser I get nothing, and when I search for 1N270 diode I only find a note that it is obsolete. What is now used in place of this part?
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2answers
132 views

Flyback diode forward voltage drop

In an ideal flyback diode selection, one would seek a diode which has very large peak forward current capacity (to handle voltage transients without burning out the diode), low forward voltage ...
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0answers
26 views

Convert Analog Based Full Adder Circuit into CMOS Based circuit?

I am working on PTL(Pass transistor logic) ALU for improvement in dynamic power i reduce transistor count from 8(Traditional Design ) to 6 for its adder module. assume transistor as ideal one.circuit ...
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1answer
72 views

Which diodes for 12v indicator light circuit?

Which diodes for 12v indicator light circuit? I have a car whose signal light audio indicator is too soft to hear. I would like to set-up an visual indicator on the dash for when the signal lights ...
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1answer
31 views

Windmill generator voltage-regulation with clamping diode

I am making a windmill powered generator. The charge controller I have is rated for a maximum input of 15V. I want to protect the controller in the event of high voltage spikes produced in a wind ...
2
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2answers
53 views

Peak output current of a Full-Wave Bridge Peak Rectifier

I am attempting to design the first section of my power supply. In this case, I am going through my calculations for the Rectifier section. I am simulating my circuit with PSpice and while most of my ...
2
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1answer
111 views

How to keep voltage when using two diodes to run two irrigation stations?

My limited knowledge of electronics allowed me to solve a 'problem' that I had with my sprinkler controller. I wanted to run zones individually, but for some zones also wanted to run them together ...
0
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1answer
61 views

STM32 Protection Diodes and Voltage over VDD

I have a 3 color LED that I'm controlling from an STM32. VDD for my mcu is controlled by a switching regulator set to 3.0v . Unfortunately the forward drop on the the green led is 3.2 volts. This ...
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1answer
70 views

Semiconductor basic

In reverse bias situation electrons attracted towards the positive terminal and holes attracted towards the negative terminal widen the depletion region. My question is why can't these hole ...
1
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1answer
46 views

How to model IR LED Diode in SPICE [duplicate]

How does one model an IR diode in SPICE? Specifically, the TIL38. Datasheet here: http://www.supermoduul.com/PDF/TIL38.pdf I get it that Is needs to be found - ...
3
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1answer
161 views

What is the purpose of D1 on the gate of the MOSFET? [NCP3065]

I've built this DC-DC LED Driver, and don't quite understand the purpose of D1. In particular it works with a 1N4007, but I wanted to replace it with a Schottky type for faster switching since the ...
0
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2answers
58 views

Zener Diode - Vz0

Theoretically, what is the importance of Vz0 in the following figure. When modeling the zener diode, why is Vz0 used over the diode's given Vz? For modeling, I was given the formula Vz = Vz0 + ...
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3answers
60 views

Can we minimize the no of transistor by using Transistor connected as a diode [closed]

I need to know the advantage and limitation of a transistor connected as diode. In a paper which i ref..its existing level shifter circuit consist of 17 no of transistor(CMOS) and this shift the ...
7
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1answer
263 views

555 saw tooth generator diodes purpose?

I'm given this 555 timer based monostable saw-tooth generator. This is a known arrangement for this part. The difference from other circuits I've seen is that the bias network of the external ...
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0answers
35 views

What happens to the energy bands when a forward bias > Buit-in potential is applied [duplicate]

When we applied a forward bias across a PN junction, the barrier height of the depletion region reduces. What will happen to the energy bands when we apply the forward bias greater that the built-in ...
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1answer
51 views

How is the negative resistance feature of tunnel diodes used in oscillators?

Can someone explain how the negative resistance feature of a tunnel diode is used in oscillators with the help of this circuit diagram:
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1answer
69 views

How negative resistance feature of Tunnel Diode is used in oscillators?

How is the negative resistance feature of Tunnel Diodes used in oscillators with the help of this circuit diagram.
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1answer
104 views

DIODE as capacitor?

How does Diode act like a capacitor when voltage across diode is less than forward voltage spec. Basically when diode is turned off? What is its usual capacitance when diode (zener) is turned off.
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2answers
72 views

A question about Diode Clamps

I was just wondering out of curiosity... In the following circuit, if I were to supply a steady DC voltage to Vin and another to the Offset input, would this be true: Vout = Vin - Offset
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1answer
50 views

Modeling the Diode forward Characteristic

I want to know easiest way to remember the modeling methods. What I have figured out, is that we only have to find out resistance of diode in case of small signal model, otherwise we will be provided ...
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1answer
104 views

Protecting NPN transistor from negative base-emitter voltage?

I have a circuit that converts 5V RS-232 polarity signals (logical 0 = +5V, logical 1 = -5V) to 3.3V TTL polarity (logical 1 = 3.3V, logical 0 = 0V) using a BC548 transistor. It forms a NOT gate so ...
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2answers
45 views

Rms value of rectified output from a half wave rectifier

The rms value of an alternating quantity which is the input to a half wave rectifier is Imax divided by square root of two. Then the rms value of output should be IMAX by 2*sqrt two. But it Isht ...
2
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3answers
123 views

Does a clamping current specification under Absolute Maximum Ratings imply that less current is OK?

I have an application where I want many small signal relays driven by an I/O expander chip. In this case, I have selected the Microchip MCP23017 (Datasheet) as an I2C to GPIO expander. I have also ...
9
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5answers
728 views

Why don't relays incorporate flyback diodes?

Warning: this may be an extremely naive question (if so, please enlighten me). Many applications of relays require a flyback diode to protect against inductive voltage. I'm unable to find any relay ...
0
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1answer
80 views

Making an AM radio with a silicon diode

I've been working a few days on this and have still come up with nothing. I am trying to make an AM radio using a silicon diode, but all of my attempts have failed. I believe my latest attempt most ...
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0answers
31 views

Amplifying an antenna signal before rectifying it

I do not have any germanium diodes for a radio project I am working on. Due to this, I must amplify the antenna signal before I rectify the signal, as I will be using a silicon diode. How do you ...
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1answer
65 views

about the diode detector

Suppose we have the following diode (ideal diode) detector: In a Course notes, they did the following: When the diode is on, it conduct current \$i_{d}\$ which is also equal to ...
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2answers
94 views

How to use ordinary voltage regulator from a 40amp source?

My power source is 12v 40amp(car battery). My project needs 12v but only 500 or 1000ma max. My 12v voltage regulator (NTE960) explodes with 40amps, so I must reduce the current (too much current for ...
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1answer
65 views

Diode in Proteus

I am designing a circuit that has some diodes. And I found a problem. Please take a look on the images and tell me why the 8th pin is at HIGH level?
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2answers
98 views

Can I use a diode to block current?

I am building a circuit from a 4.2 volt battery and I cannot use resistors to lower the current, and I cannot calculate the load resistance but I want to protect the switch from over current, and ...
0
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1answer
55 views

Diode Rectifiers Driving Highly Inductive Loads Producing Input Square Wave?

According to a textbook that I have, when driving an inductive load with a diode rectifier, the input current becomes distorted. The illustration of the circuit below has the input as an AC source, ...
3
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1answer
75 views

Ideal Diode Equation: Current Too Large

I'm having some trouble working with the Shockley's Ideal Diode Equation. I'm trying to generate a model plot for a 1N4001 type semiconductor diode, but the resulting graph seems incorrect. ...
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1answer
71 views

How the envelope detector works?

Suppose we have an ideal diode cascaded with an RC filter , what is exactly the analytical expression of the voltage across the resistance R in terms of our initial (ac) voltage , that is : how to do ...
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1answer
43 views

How is the PN junction formed?

I am confused about a couple of points: When the electrons diffuse from N side to P side, and holes diffuse from P side to N side, negative charged region is formed at the junction in P type and ...
4
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1answer
64 views

Unexpected rectifier waveform

I've built a simple half-wave rectifier using the following components. \$10\$k\$\Omega\$ resistor 1N914 diode 1 kHz sinusoidal source I'm measuring the voltage across the resistor with an ...
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2answers
113 views

Thinking about LED light bulbs..as full wave rectifiers

Tw questions on LED bulbs. First Qt: Just something I was wondering. Since LED's bulbs are, by definition rectifiers ( I believe they are full wave) would it be possible to use them as such by putting ...
0
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2answers
93 views

Using normal diodes to rectify high frequency waveforms

Recently I was try to rectify the output of an “electronic transformer” using an ordinary rectifier diode 1N4007. The output of this device is bursts of frequency around 50kHz, with an envelope of ...
2
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2answers
134 views

How does a flyback diode work?

In a previous question I posted to the exchange I asked for some instructions on trying to variable speed control a motor. Someone suggested utilizing PWM from my Arduino to open and close a ...
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2answers
90 views

Soft Clipping with Diode

I have this simple circuit with a diode (with voltage drop \$V_d\$) and resistor in parallel, and another resistor in series with them both. The circuit can be seen in the diagram below. ...
0
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1answer
97 views

H-Bridge diode makes the motor go faster

I am making a little robotics project were my robot spins around a shaft. Since it can't spin a full 360º turn I placed some limits in the software but just to be sure I also placed two limit switches ...
0
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3answers
77 views

Reference voltage source using classic rectifier diodes

I want to make some simple voltage stabilizer using operational amp, but need source of reference voltage. I know that I can buy this component, but shop is far away from me and paying 8e for courier ...
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3answers
75 views

Diode rating for a UPS project with extra battery

I am planning to add an additional 12volt deep cycle battery to my APC UPS but I dont want to use the charging circuit built into the UPS. I think that if I throw in a Diode between the external ...