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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Which diode configuration do I need for this solid state relay?

I want to add snubber or supression protection diodes for a solid state relay. Here is the diagram without the diodes: And this is the SSR I'm going to use: ...
6
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259 views

Lowest voltage drop diode possible

I am harvesting energy from an NFC device using a tuned antenna on my PCB. Though this method I am able to generate about 3.05V. I would like to charge a super capacitor using the power harvested from ...
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57 views
0
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23 views

Cut off low voltage lithium battery?

Working on a portable boombox powered by four 18650 Panasonic NCR 3400 mAh cells in series. I bought a PCB and I have a small 4s balance charger. The PCB will be secondary if anything fails and cuts ...
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2answers
55 views

Diodes and fixed voltage source [on hold]

This came from my elementary physics lab practical. The piece which I am confused over is the language used so and I quote Note that the ideal fixed voltage source direction is in the opposite ...
0
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2answers
54 views

LED MOSFET switching circuit

So here's my circuit for powering 4 LEDs with my arduino. Right now it seems to be working perfectly. I send HIGH to any of the pins and it lights the LED. I was wondering if I take in account the ...
0
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1answer
31 views

Diode Circuits Help

1) Assuming the input is expressed as Vin = V0 cos ωt, plot the output of each circuit in the figure below as a function of time. Use an ideal diode model. In the following problems, assume VB=2 V ...
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146 views

Voltage drop across a diode [on hold]

For the sake of simplicity, the voltage drop across a diode, \$V_d\$ made of silicon is assumed to be \$0.7\mathrm{V}\$ after the input voltage exceeds this voltage; and \$V_d\$ is assumed to stay ...
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1answer
36 views

Basic doubt regarding attached circuit

Could some one give me a quick answer why voltage drop at the drain of M1 is 4.611V and not 5V. Since the N-FET is non conducting, it acts as a open. similarly the diode should also be off and open. ...
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52 views

Help identifying diode

so I have this diode that is under a transformer on a battery charger. I was looking for faults on it with a thermal camera and noticed the one next to it was glowing at over 120C . I removed the hot ...
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25 views

for light on r/c plain reduce 5 volts to 1 volt [closed]

want to put 1 volt lights on my r/c plain and I have 5 volt out put not to much room and will 30 AWG wire be good ?
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0answers
45 views

I'm trying to build a Slayer Exciter [closed]

I've been trying to build this exact same Slayer Exciter circuit, but I'm running into problems. The only difference between my circuit and his is that I'm using LEDs instead. The circuit should work ...
0
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2answers
61 views

Diode oring and charger

I am trying to setup a schottky diode oring circuit to switch between my battery and a dc power supply. I am dealing with some pretty high amperages and a liPo battery, so I need to make sure I get ...
0
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3answers
73 views

Photodiode Circuit for measuring light intensity

I was wondering how to effectively read a photodiode datasheet. Leds have max current ratings and voltage drops clearly listed but the photodiode one confuses me. Im trying to calculate a resistance ...
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42 views
0
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30 views

Diode-RC Circuit Differential Equation

I want to find the differential equation relating Vout to Vin, I'm stuck at a part in the derivation and was hoping someone could help. From equating i1 to i2 + i3, I have: [![enter image ...
5
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1answer
80 views

Possible wrong use of TVS diodes?

I've been facing a weird situation and unable to find the reason behind so far, therefore I frustratedly turned up for help. I have a system comprised of 2 separated PCBs (A control box and an ...
0
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0answers
36 views

Step down converter circuit overheating

In the above circuit, the voltage is set by R7 to be about 4.1V. The coil L sets the output current to 1.2A. Input voltage is limited by C1 at 16V (approx. 14V in reality). The circuit is designed ...
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3answers
116 views

How to to Use a Nylon Shoulder Washer?

I'm somewhat curious as to how to use a nylon shoulder washer with a bolt. There is an example of this here (http://electronics.stackexchange.com/a/45579/95654), but I can't figure out how it would ...
0
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3answers
65 views

Light emitting diode colors

Why don't they use different colors of covers for LEDs, like they do with light bulbs instead of making them form differnt semiconductors to have different colors? In other words, why they don't make ...
0
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1answer
43 views

Power single device from two circuits

I am creating a closed loop gycol heating/cooling system for beer fermentation and lagering. The system uses a ITC-1000 temperature controller and two power supplies to feed a heating circuit and a ...
0
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3answers
46 views

Voltage graph of capacitor with AC source

below is the 'Dickson's charge pump'. What I want to know is that when clk is on, why does Vx is 3v instead of 1v? I just thought Vin contribute 2v to cap, clk contribute 1v to cap, so 2v - 1v = 1v ...
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2answers
147 views

what will happen at output current ? when two zener diode is in series? [closed]

"what will be the output current when we connect two zener diode in series " simulate this circuit – Schematic created using CircuitLab ?
3
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2answers
71 views

I need some help understanding overshoot and ringing in MOSFET half bridges

From FDA75N28 datasheet: What I am having difficulty understanding are the reasons behind overshoot and ringing in V_DS. Now, to what I already know: The current that passes in an inductor cannot ...
0
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1answer
50 views

diode and resistor in parallel with resistor

how do you calculate V\$_{R3}\$ in the circuit below? V\$_{in}\$, all the resistor values and the type of the diode are known. By simulating this circuit one can see that V\$_{D}\$ is increasing ...
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1answer
41 views

Efficiency of a centre tap full wave rectifier(qualitative analysis)

In a centre tap full wave rectifier the output voltage is half of the input(secondary coils voltage) voltage, so the power is half of power of secondary. Also in half wave rectifier the only half of ...
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1answer
73 views

What is the difference between rectifier/signal diode and zener diode?

I need to caution: I'm absolutely beginner in electronics! :) I'm stacked with the difference between rectifier and zener diodes. I've already read all the answers at ...
0
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1answer
45 views

Switching from battery to usb power source [duplicate]

I'm currently creating a small device to operate on a CR2032 battery when it is disconnected and a USB power when it is connected. I want the device to be powered by USB when it is connected, without ...
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2answers
78 views

How do I calculate voltage using the complete diode method?

Doing extra examples for a electronics class, came across a section uses the Complete Diode Model (We haven't covered it in class in much detail, only the definition). The question is: Determine the ...
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2answers
231 views

What happens if I put my DC voltage source AFTER the diode instead of before?

I have a homework question on diodes, in which I have to calculate the Voltages across the diodes. All the questions I have encountered thus far have had the DC source BEFORE the diode. This one has ...
3
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2answers
383 views

Differences in using c user-defined functions on PC and on ARM

I am new to programming in c and to ARM also, so forgive me silly question. I would like to find answer on the net rather than to bother you, but there is not many materials in the web. I am using ...
0
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1answer
68 views

LED forward voltage - why does series resistor take excess voltage?

I am currently having a problem wrapping my head around a pretty simple problem. I know in multiple sources when taking into account considerations and assumptions of powering an LED you can use it's ...
6
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2answers
127 views

Why do the inputs of this CC circuit op-amp need clamping?

I'm studying the constant current circuit of the HP E3610A DC Bench Power Supply. I'm building a supply of similar topology using surface mount components and the LF442 isn't available in a SOIC-8 ...
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2answers
85 views

Very low power voltage regulator - diode?

I'm developing a very very low power system, and it has some components that need 3.3V. These components are actually spec'd to operate anywhere between ~1.8V and 3.7V, so theres some wiggle room ...
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1answer
68 views

Where do I put capacitor in my diode bridge AC to DC circuit?

I want to make a AC to DC converter, the seller give me these: KBP307 diode bridge 2a104j capacitor And a 470uF 50V capacitor. All I can find on the internet only use one capacitor or two ...
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2answers
83 views

Does the N material need to be directly touching the P material?

I know a diode works like: anode wire --[ P ][ N ]-- cathode wire Would it also work like so? ...
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3answers
445 views

Schottky barrier diode as a bridge rectifier?

I need a bridge rectifier for my project and the diodes I currently have can only handle up to a maximum of 1 amp which is not enough. But I have a bunch (YG862C15R) - datasheet. Can I somehow use ...
0
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1answer
90 views

How do you solve for current through a zener diode once it has reached its zener voltage?

I am doing test prep for an exam tomorrow and ran into this problem. The question asks you to plot Vo in terms of Vs. It also provides information that the zener diode is ideal and that its zener ...
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0answers
2 views

Factors affecting crossing of depletion region for carriers

My question is that the crossing of depletion region for the carriers(lets say electrons) , in a pn junction diode depends on what factors? Is it the number of electrons or the energy of electrons ...
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2answers
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Range of Holes Flow in pn junction diode

Lets suppose we have a pn junction diode made of silicon. When it is forward biased we say depletion region shrinks because electrons in the n-region are pushed towards the junction resulting in the ...
5
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1answer
99 views

Understanding an 'ideal' diode made from a p-channel MOSFET and PNP transistors

The Raspberry Pi B+ models have a protection circuit between the USB connector and the 5V net on the board. They recommend putting a similar protection circuity on a Pi HAT before 'backpowering' the ...
3
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2answers
556 views

The classic 1N34A Ge Diode has a Vf of 1V… how could a diode with such a high Vf work in crystal sets they were packaged in?

Back when I was younger I got a crystal radio set kit which included a 1N34A Ge diode (as far as I can remember, I don't have it anymore). I wanted to build one again recently and all I had a was a ...
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65 views

Help me to calculate and sketch transfer characteristic of this BJT circuit

Here is my task: Calculate and sketch transfer characteristic for circuit below, for 0 < Vin < Vcc. It is known Vcc = 2.1V, VBE = 0.7V (when BJT conducts), VD = 0.7V (when diode conducts), VCES ...
0
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1answer
42 views

MOSFET overheats and results in short circuit

I use this 40V, N-Channel NexFET Power MOSFET http://www.ti.com/product/CSD18504Q5A in simulate this circuit – Schematic created using CircuitLab The solenoid takes 25A peak current. ...
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3answers
40 views

Parasitic Capacitance Diodes

I was reading about diodes and I know that they have a certain parasitic capacitance. Now, according to Wikipedia, At low frequencies parasitic capacitance can usually be ignored, but in high ...
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1answer
41 views

Clipper circuits

If I want a clipper circuit that clips at the negative voltage at -4 V, can both of the following solutions be used? simulate this circuit – Schematic created using CircuitLab Or is one ...
0
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1answer
36 views

Weird behaviour from S1J-13-F Diode

I have the following circuit in which I expect a 1.1 V voltage (datasheet)across the diode but I am measuring 6.18 V. This voltage is output no matter what way around I have the diode, consistently ...
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0answers
66 views

Zener diode,Mosfet protection

I am building a circuit in order to see how to protect a power mosfet with a zener diode. This is my circuit: I have used a 560 uH inductor, 28 V zener Diode, 1K ohms resistor and a square wave ...
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1answer
196 views

Using diode for reverse current protection

There are some devices such as step up converters that if you connect the power supply reversely it will burn, also some ICs such as ic555. my question is >> why the manufacturer doesn't use simply a ...
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1answer
34 views

Separating lithium ion cells for charging

I have a large set of circuits to make using Lithium Ion cells for power. The circuit requires ~12V, which is easily achieved by stacking three cells in series, but the charging circuits I've ...