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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Plot of Ic and Vbe function

The book page 12 show the plot of collector current Ic vs temperature at fixed Vbe =600mV. With the equation: Ic = Is*e^(Vbe/VT). Where Is = 10^-16A. Vbe = 0.6V VT = kT/q = -8.6173324×10−5*T ...
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21 views

Cant Find 1N967 SMD Variety [on hold]

I cant find any SMD packaged 1N967 Zener Diodes, do the SMD variety of this diode have different part number?
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58 views

Diode Rectifier Circuits

I had a question. If anyone explain then it would be huge benefit for me. What is the effect in output for changing input signal frequency for half and full wave rectifier(with and without ...
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0answers
26 views

Unknown diode identification (27 XD or XD 27 markings)

Very much a novice here. I was attempting to repair an integrated control unit board from a 1990 honda/acura integra, but alas what I was hoping to be an easy fix is turning into more than I can ...
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1answer
68 views

What type of 555 timer circuit is this [on hold]

Could someone please describe what sort of 555 setup/circuit is in the image and how it operates. This is the webpage on which I found it http://www.thefintels.com/aer/protected/timer.htm Thank you ...
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40 views

Diode Circuit analysis [on hold]

how can i solve circuits like this ?! how current flow though determine the diode modes and calculate V and current in branches
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37 views

what is the possible causes of diode failure [on hold]

What are the possible causes of diode failure and Input diode of IQ4H-FTX(DC-DC converter) was shorted and input capacitor is 3uF.Input voltage is 300v and input current is 4A.
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1answer
30 views

Heatsink for diode and mosfet in 12V 15A LC circuit

I am trying to design simple step down bulk voltage converter: This circuit will be 'stepping down' 12V to lower voltages depending on needs (driven by 20kHz PWM with variable duty cycles). The ...
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1answer
28 views

Can I use barrier rectifier as a diode in bulk converter circuit?

I have this LC circuit which will work under 12V and quite high load (10-20A): The diode D1 must be a shottky diode but the only similar thing I have at the moment is actually 3-leg MBR3045CT ...
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1answer
54 views

Why the current across a diode is zero when the forward bias voltage is less than barrier potential?

In the I-V characteristics of diodes under forward bias , I have seen that the current starts increasing from zero only after reaching the barrier potential , say 0.7 for silicon. As far I understand ...
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2answers
64 views

Voltage Clipping with Two Series-Opposing Zener Diodes

Theory Schematic for Voltage Clipping with Two Series-Opposing / Bidirectional Zener Diodes Consider the following schematic for voltage clipping with two series-opposing/bidirectional Zener Diodes ...
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1answer
48 views

How to identify semiconductor parameters for spice model?

I am simulating circuit which uses NPN IRFZ44N power MOSFET and MBR1560CT rectifier (used in the circuit just as a shottky diode, connecting 2 out of its 3 legs only). Here is a circuit made in ...
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4answers
151 views

Can any BJT be used for temperature sensing?

I'm looking for a cheap and easy way to monitor temperatures and came across the Microchip EMC1403 which interfaces to general purpose diodes (or transistors with their base tied to collector/emitter ...
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2answers
100 views

Differences between TVS diode and Zener diodes, in diagrams and in practice?

I have been looking at circuit protection using TVS and Zener diodes. I have seen the following symbols used to represent TVS diodes in circuit diagrams: simulate this circuit – ...
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1answer
36 views

Determining the logical function of the circuit with diodes

simulate this circuit – Schematic created using CircuitLab Entry voltages, \$Vin_1\$ and \$Vin_2\$ can be either 5V, for logical 1, or 0V, logical 0. \$V_{cc}=5v.\$ Find \$R1\$,\$R2\$ so ...
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2answers
47 views

Should I Use a Diode to Protect LiPo Battery? [duplicate]

I am building a Bluetooth speaker and will have two power options running into a DPDT Switch. One side of the switch will go to an 11.1 volt 2200 milliamp battery which will be regulated to 12v. The ...
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0answers
71 views

Finding a diode with a low vDrop at low currents

simulate this circuit – Schematic created using CircuitLab So, I'm designing a circuit which has to work with current flowing in both directions through a resistor. I need to measure the ...
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2answers
44 views

Diode Sizing for DC Motor H-Bridge

How do I calculate the size of the diodes used in an H-bridge for a DC motor? What is the relationship between the motor parameters and the diode parameters?
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4answers
283 views

Regular (not Zener) Diode as Voltage Regulator

I see a lot of information regarding Zener diode voltage regulators but how about a regulator diode voltage regulator? What would be the potential drawbacks of using something like this: ...
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1answer
71 views

How must be real transistor model? [closed]

Transistors have some capacitance value. So where do i must put that capacitance when i want to draw real model of transistor. Also second question same about diodes? Can anyone draw simple real model ...
0
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1answer
37 views

Normal Operation Current for ESD Diode [closed]

I want to use a ESD Diode against Vehicle Battery which is rated @ 36V max. I have selected below Diode :- http://www.nxp.com/documents/data_sheet/PESD36VS1UL.pdf Now, I am okay with working voltage ...
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1answer
60 views

Find the maximum of three sinusoidal voltages at any point?

Given three sinusoidal input voltages, I need to design a circuit to output the highest voltage, without using opamps. I honestly have no idea where to start, so would just appreciate any hints or ...
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1answer
40 views

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: ...
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3answers
297 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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1answer
64 views

Need to Identify unknown components D53, CT7 and 22X

Please help me to find unknown components
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2answers
59 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
62 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 ...
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1answer
37 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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2answers
150 views

Voltage drop across a diode [closed]

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
37 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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2answers
53 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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2answers
66 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 ...
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3answers
111 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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2answers
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42 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 ...
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92 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 ...
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0answers
39 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
120 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 ...
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3answers
67 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 ...
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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 ...
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3answers
48 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
180 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 ?
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2answers
79 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 ...
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1answer
56 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
49 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
95 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
votes
1answer
46 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 ...
1
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2answers
84 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 ...
3
votes
2answers
235 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
387 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 ...