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 do the numbers on a zener diode signify

I have a zener diode obtained by reverse engineering, there is an icon of what is surely the mathematical model, and there are two numbers 41 and underneath 48, what do these signify?
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Schottky Diode disadvantage as compared to usual diode [duplicate]

Schottky diode have a low forward voltage drop (typically \$0.15-0.45V\$) and very fast switching action, as compared to traditional diode, which typically have a \$0.7V\$ voltage drop (Silicon ...
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35 views

Maximum input voltage so that no clipping occurs [on hold]

Suppose we have a combination (dual) clipper circuit with two diodes. What is the maximum input voltage width so that no clipping occurs at all? Is it 0V because in any case at least a really small ...
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1answer
129 views

Properties of transitors used as diodes

Consider the NPN BJT. Normally, if you want to use it as a diode, you short base to collector and treat the emitter as the cathode. But in principle, you could also use the base emitter junction by ...
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38 views

Flyback (?) diode on the Solid State Relay output

I am looking at the recommended wiring diagram of this SSR and I am wondering about the diode connected in parallel to the load. Flyback diodes for inductive loads make perfect sense to me, but in ...
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2answers
66 views

Diode detector strange discharging

I am building a diode detector circuit in order to detect ASK signal with 125 KHz carrier frequency and 8 KHz data rate. However, I realized I would say a strange behaviour and discharging of ...
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2answers
72 views

Avoiding body diode conduction

I am trying to design a replacement for a 2:1 switch using FETs, which would be really easy if I didn't have to concern myself with the body diodes that are present on PMOS transistors. My scenario ...
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3answers
82 views

How does a constant current (CC) power supply regulate voltage (V) in parallel circuits?

I see that some power supplies provide a wide range of output voltages meanwhile maintaining the current. For example: 2.7 A, 20-36 V output. I understand that the voltage rate will depend on the ...
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26 views

Series diode voltage clipper, on Multisim clipping and shifting on positive and negative voltage

This is my circuit: I’m testing a Series diode clipper circuit, and the end result should be this: (I've used 5V in my circuit, not 10V like in this plot, but this is not the issue) Instead what ...
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1answer
64 views

What's the difference between IC 74HC04 and IC 74AC04PC?

I am trying to make a simple logic gate simulation for which I require the former IC but I could only procure the latter. Will it still work?
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1answer
43 views

Why avalanche breakdown in a PN junctions is said to be caused by minority carriers?

Reverse bias increases the depletion region (the "space charge region"). Remembering that electrons travel from (-) to (+) terminal, and that in reverse mode the (+) terminal is attached to the ...
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Zener Diode identification (color bands)

I am trying to fix power supply, but I have a problem with identification of parameters of zener diode. Diode at the photo is shorted. Can anyone help me identify the value, based on the coloured ...
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3answers
61 views

Half-wave recitifer diode (0.7v) problems

I can't seem to decide which is the correct answer for this question. An ac voltage of 5 V (peak) is applied to the circuit shown. What is the peak inverse voltage (PIV) of the diode? Silion diode ...
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2answers
45 views

Reading Diode Datasheet

I am learning about Diode and its use (Just get interested in electrical stuff after reading a DIY project), I have been reading information around and want to get more understand on diode especially ...
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33 views

Replace Panasonic ML421 battery

I'm trying to replace a rechargeable ML421 battery in my old Panasonic FX100 camera. The specs of the old battery are here ...
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3answers
126 views

problem regarding AND gate using diode

I am currently having problem understanding the basic circuitry of AND gate using diodes and how it works. As we know, the basic AND gate circuitry using two diodes is something like this. And we ...
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0answers
29 views

opamp input protection for piezo as microphone

I have a Piezo buzzer that I made into a contact mic, across a 1Meg resistor. That goes into an opamp that I use as a differential pre-amp. I'm thinking I should add some diodes to protect the ...
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26 views

To find the current of a current mirror circuit

In the figure given above all transistors are matched and! diode voltage and Vbe = 0.7V. Also the dc current gain is assumed to be very high. I got the answer for I as 3.6mA. However, the answer ...
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1answer
57 views

Limiting small signals to one direction (ideally with passive components)

My setup is as following: I use a Y-Cable for splitting an audio signal to two devices (boxes and earphones). The headphones have quite big speakers so they act also like a microphone - feeding back ...
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3answers
116 views

The “AND” gate function

I am learning about the "AND" gate function in Navy school. What I know is that when a low voltage is at the base of Q1, the transistor is in cutoff mode since the collector is reading high (> 2 ...
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35 views

Function of diode-connected transistor [duplicate]

Can anyone explain to me how a diode-connected MOS transistor works especially intuitively?
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1answer
40 views

How the Depletion Region is shrinked when Diode is in forward biased?

I would like to know why does the depletion region gets shrinked when a potential is given to a diode(Forward Bias).Is it because we have given a higher voltage than the voltage of the depletion ...
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2answers
78 views

Dark current of photodiode gets higher after heating, why?

I'm doing some experiments using photodiodes. I raised the temperature to about 1000 degree Celsius for 1 second with melting AuSn near the PIN junction. Then the dark current of photodiode is higher ...
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1answer
44 views

Will a tvs diode help my relay with inductive loads?

I am not an EE, so please be gentle! I will obviously get a certified EE to review my design before anyone else touches this so please assume that I know enough to at least be safe with 120VAC and am ...
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1answer
42 views

Load lines and Esaki diodes

I wanted to check something I was working on, and it's an assignment so I don't want the answer, I just want to know if I am approaching it right. I have an esaki diode. I have a curve (the s-curve ...
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2answers
72 views

Long term effect of over-voltage on clamping diodes and ADC reference voltage

I am contemplating building a small voltage/current monitoring circuit that needs to monitor a wide range of voltages and currents. Currents will just be a single low-side shunt. Monitoring will be ...
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2answers
75 views

How does reverse leakage current of a Schottky diode come into play with a SMPS?

Looking at diodes for a low power switch-mode power supply I'm designing. I'm not quite sure what the reverse leakage current value is, or if it's relevant in the component selection.
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4answers
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What is the function of a diode connected to a GPIO?

I'm reading a schematic (done by a former employee) with a microcontroller, and I came across this circuit: What is the function of D1? Also, I think that R2 isn't necessary, because the control ...
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3answers
60 views

What is the Q-point of the zener diode?

Is the Q-point f the zener diode in figure equal to its breakdown voltage of 4 V ?
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1answer
54 views

Diode peak reverse recovery current

I'm trying to calculate the peak reverse recovery current \$I_{RM(REC)}\$ of a diode from information given on a typical diode datasheet (really what I want is the transit time TT, but the only piece ...
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1answer
40 views

Finding depletion region without built in potential

I am trying to solve a problem as to find the depletion region's width of a p+-n-n diode. I am given the width of the first n region and the doping of both n regions. Here is the problem: I ...
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40 views

Cannot find built in potential for this problem

I am doing some homework for my semiconductor physics class but cannot for the life of me find out how to continue... Here is the problem: A p+ n junction is formed in an n-type substrate with ND = ...
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2answers
158 views

Can I use a BC547 NPN transistor as a thermometer?

In the article Electronic Thermometers for Brewers Ken Schwartz talks about how to use a 2N4401 to create a diode thermometer: I attempted a similar setup with a BC547 transistor ( BC547 Transistor ...
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1answer
64 views

Silicon Diode problems

Hi guys i just learned a new topic last week and i was unsure on these questions. Does anyone know how to determine in the diagram if it's forward-biased or reverse-biased? How can i calculate the ...
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66 views

Anti-Parallel Diodes and H-Bridge

Does the anti-parallel diode forward voltage in a single phase inverter need to be lower than the body diode of the MOSFET? I have MOSFETs with a forward voltage of 1.2 Volts, and SiC diodes with a ...
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291 views

Another 'What is this component?' question

I have looked through all the other 'what is this component' questions and have not found my component. I am looking for the component in the red box. It is from a rectifier circuit off a 1973 9.8 hp ...
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44 views

How to analyze this diode circuit (zener regulated power supply)?

My solution: a- Full-cycle rectifier. b- V1(max) = vs(max) - VDo = A - Vdo = 15sqrt(2) - 0.7 = 20.5 v c- Vo = Vz = 15 v. d- Vr = Vp * T / 2RC = (15sqrt(2) - 0.7) * (1/60) / 2 * 100 * 1000 * ...
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How does a diode clamping circuit protect against overvoltage and ESD?

I always see this circuit when talking about overvoltage or ESD protection (does this circuit accomplish both, or just one?): However, I don't understand how it works. Say I put in 20V at Vpin. So ...
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32 views

Please help determining component specs of BQ76930 (BMS IC)

I was wondering if you guys could help me with some questions I have about the BQ76930 schematic (below, also found here: http://www.ti.com/product/bq76930 on page 42). How can I determine what ...
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2answers
65 views

How to measure the saturation current of a diode

Just wondering how with DC measurements you could measure a diodes saturation current and the Emission coefficient factor N. I was thinking a basic DC circuit varying the voltage taking voltage ...
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1answer
103 views

Will a flyback diode prevent an analog MCU input from being destroyed in this schematic?

Quick question: In this schematic, would D1 prevent high flyback voltages caused by the motor going into the voltage divider network and destroying pin A0 on the MCU? Pin A0 can only tolerate 5V max. ...
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1answer
82 views

Determining Vo in a circuit with diodes

This is the question: And this is my solution: (a) (b) When vI > 2.7, D1 is on and D2 is off. The circuit will look like: ...
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54 views

PWM and flyback diode dependency

I have to choose components for a pcb motor driver, there is a dependency that I have to take into account between the PWM frequency and the speed of the flyback diode? If yes, what it is? Thanks
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1answer
65 views

Analyzing a circuit with diodes connected in series

This is a problem with its solution: What I don't understand is how he replaced the three diodes with the voltage sources in DC-analysis or with the resistances in AC-analysis. What assumptions ...
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2answers
109 views

Diodes in series

simulate this circuit – Schematic created using CircuitLab The diodes are both made of Silicon. What will be the voltage across D1?. Edit: I voted for 0V only. But this is the ...
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1answer
94 views

Zener diodes in series

Hello, In this problem, i am not able to understand how I2 is getting replaced by I01. More over, will these zener diodes become ON as the applied voltage is less than Vz? Thanks in advance.
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What should I do with the unused diode in the SOT-323-3 (SC-70-3) package?

I'm planning to use one of this diode in my circuit. But the package contains two of them. I chose it mainly because of its 3ns reverse recovery time. How do I use them in my circuit? I have three ...
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2answers
87 views

Need help identifying a strange symbol in a wiring diagram

I have this simple wiring diagram for an old tractor, and there are some symbols that look almost like diodes, but not quite. I have highlighted most of them in red in the attached image. Do these ...
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68 views

Zener Diode Minimum Input Voltage

My question is with regard to establishing regulation using values taken off the characteristic curve. I have \$I_{kn}\$ = 1.8mA and \$V_z\$ = -8.2V. How can I determine the minimum input voltage for ...
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555 timing formula when the diode forward voltage drop is not neglected

(Image Sources) In this modified astable multivibrator circuit the forward voltage drop of the diode D1 is always ignored, and the timing formulas are given as $$ t_1 = \ln(2)R_1C_1, \quad t_2 = ...