Diodes are semiconductor components made from a P-type and N-type silicon material, that allows current to only flow in one direction.
0
votes
2answers
35 views
Can I replace an ER107 for an IN4007 or IN4005?
I am trying to repair a Power Supply where 2 resistances and one diode got burned, that diode was a ER107.
I was looking at the datasheets and the things that change are the Forward Voltage, Peak ...
0
votes
0answers
18 views
How to wire latching SPDT relay using proximity switches
I was asking a question in a discussion and was told that I was opening up a new discussion and that went against Q&A forum...
So I am asking here...
You can see the original discussion here: ...
0
votes
1answer
81 views
I don't understand why this open collector not gate needs diodes
I'm trying to understand why the following circuit, which corresponds to an open collector not gate, needs to use two diodes. The circuit I'm taking about is below:
I think I understand the one just ...
6
votes
4answers
668 views
Causes for a burned up flyback diode on a relay?
I'm repairing a control board for a premium washing machine (model #s at bottom for anyone that's interested). The machine was displaying an error code for relay failure. I took the board out of ...
2
votes
2answers
65 views
How do I calculate the diode parameters for reverse polarity protection?
I understand that a diode allows current to flow in one direction only, and that inserting a diode in series with a power source will protect the circuit from a reverse polarity battery.
How do I ...
0
votes
1answer
41 views
Led as an input photodiode [Arduino AVR]
I’m trying to use a LED as a light sensor(input) connected to a Arduino Nano.
I connected the led with the Anode at digital pin 8 (PB0) with a resistance of 56 Ohm and the Cathode at an analog pin A0 (...
0
votes
1answer
35 views
How to test 3528 smd LED
Using my DMM and the diode selector, the SMDs 3528 in a brand new Led bulb does not light. I used this method to test the classic "round" leds but in this case it does not work. What seems to be wrong ...
4
votes
3answers
333 views
ESD ratings of diodes and bipolar transistors
While it's easy to find ESD ratings for ICs (bipolar, CMOS, and any mix) and to some extent for MOS transistors (for the inherent reasons), I don't find ESD rating for many common diodes (left apart ...
1
vote
1answer
97 views
Component identification (SMD)
Help me identify this component: test results identify it as a diode. I believe the manufacturer is Vishay, but I can't find anything when I search for it. There is a label placed on the component: "....
-1
votes
0answers
76 views
Help with a diode problem
Here is the problem text:
\$R_1\$ and \$R_2\$ are 5.6 and 0.7 kilo-ohms respectively. The voltage \$V_{CC}\$ is 5.3 volts. The diodes follow the standard diode equation, with \$I_S\$ of 28.6×10−12 ...
0
votes
1answer
59 views
Transistors as Switch and Amp to control LED strip
I am controlling an LED strip based on audio input from my phone. I am having some good results, but not exactly what I want, and my ignorance of transistors is holding me back (I'm a Mech E major ...
0
votes
1answer
49 views
Simple diode question
I have the following doubts about a p-n junction diode:
1) If we short the diode ( connect it's terminals together without any power source) then how is the Kirchoff's law across the loop satisfied?
...
0
votes
2answers
109 views
High-Power Switching using MOSFETs
For a project, I need a means of switching a high-current circuit between two inductors. The purpose is, each inductor serves as an electromagnet, and they are switched every 15s or so in order for ...
1
vote
1answer
49 views
Diode Ideality Factor
Does the diode ideality factor can be lesser than 1? or very close to 1?
ID and VD are the diode current and voltage, respectively
q is the charge on the electron
n is the ideality factor
k is ...
-2
votes
0answers
70 views
Keeping Logical Inputs fed by diodes from floating
I am implementing a circuit similar to the one shown below
The idea behind the circuit is that the switches on the left work as the buzzers on the show Jeopardy.
Each player’s buzzer consists of a ...
0
votes
1answer
108 views
Using mosfet as diode (Making an UPS)
I'm trying to make a high power UPS, I have a 13.6V PSU and an Inverter and a Lead acid battery.
Everything would be connected this way:
There's a problem with that circuit, if the battery is too ...
1
vote
1answer
67 views
Jumpers within diode through-holes in a PCB
I'm designing a keypad and I may not need to use diodes so I was thinking to use open jumpers within through-holes.
In case I need a diode I can still solder it otherwise I can bridge the jumper.
Is ...
0
votes
1answer
57 views
2n2222 transistor control motor from raspberry
I'm new and i know almost nothing about electronics (i'm a programmer).
I have to control a DC motor by using a transistor with a PWM pulse given by my raspberry.
This is the scheme i thought about, ...
-3
votes
0answers
54 views
Bridge rectifiers
How to find the peak primary and the peak secondary voltage ?
From research I found out that the formula for primary voltage is equal to
primary voltage = half* RMS voltage
But I do not know how to ...
1
vote
4answers
53 views
Flyback Diodes For Inductive Loads With Long Wire Runs
I have a project that uses several high power DC solenoids (50 VDC) that will have ~10 feet of wire between them and the driver board. This is for pinball machines. These solenoids typically come with ...
-3
votes
3answers
94 views
Questions regarding a diode and a resistor in series [closed]
For the first question, I believe that the diode is shorted.
My reason is: Since the voltage across the diode is positive (i.e 5V), the current will flow in the circuit, since current flows in the ...
0
votes
2answers
48 views
Schottky - Zener - TVS diode
I have a question!.
As I understand,the 3 diodes are "more or less" the same but with really important differences:
Zener diode: Clamps voltage at a breakout lvl.
Schottky diode: Like Zener but it ...
0
votes
0answers
59 views
why do mosfets often require protective diodes?
Why do Inverter circuits that use mosfets often require another hyperfast diode between drain and source? Mosfets come with one builtin dont they? is it because of when a inductive load is switched?
-1
votes
2answers
57 views
Voltage gain of common emitter amplifiers with negative feedback
Im trying to make some fuzz pedals for guitar using a single transistor. The one on the right is as far as i understand a common emitter amplifier with negative feedback, I somehow can't find anything ...
0
votes
1answer
76 views
How does this circuit work? I can't reproduce the results in real life
I've built this circuit in Paul Falstad's circuit simulator (trapezoidal approximation is off), and I don't understand how it works.
When I switch the input from 0V to 5V and then to 0V again, the ...
0
votes
1answer
79 views
Help to ID a Diode? I think
Can anyone please help me to identify this? I’m not sure if it a Zener, Schottky, or rectifier.
It came off a board from a 12V camera. The camera is not getting power.
I thought it just look like ...
0
votes
0answers
49 views
Diode vs diode-connected transistor [duplicate]
Are there any differencies in functionality between those two or any advantages of one over the other?
The only thing that comes to mind why someone would use diode-connected transistors over diodes ...
2
votes
1answer
84 views
How to decrease the speed of a DC motor?
After replacing the motor in a cassette player with a matching 6V DC motor, the minimum speed of the motor is too fast for desired playback speed (even when the internal potentiometer is at the ...
0
votes
3answers
34 views
Will lower voltage power source supplement/charge higher voltage power source?
I would like to add a 4.5V 1.5W solar panel to supplement an existing electrical setup in my vehicle. My current setup is an Arduino and other electronics wired up to an "add a fuse" in the car fuse ...
1
vote
0answers
65 views
Help me understand this diagram
I'm building a kit car with a bike engine and want to strip down the original bike wiring loom as much as possible.
I'm trying to work out how the junction box that controls the starter motor works.
...
0
votes
4answers
76 views
Question regarding ripple factor
For the pictures above, I am confused as how to how they got/derived the formulas for the peak to peak ripple voltage (VrPP) and Vdc. So far, I got the output voltage, which is 14.9 volts. However, I ...
1
vote
2answers
319 views
What is the purpose of diodes in parallel with transistors in a solid state relay?
I know the diodes facing each other are for ESD protection, but what do the diodes facing opposite do ?
The circuit is basically a 24V (usually used in industry) digital output.
1
vote
3answers
97 views
Balance of current through oring diodes
I’m curious about current flow through an oring diode configuration. I’m using oring diodes to “autoselect” between two power sources: a 4.2V (max) battery, and a 5V USB line. The battery has one ...
0
votes
1answer
47 views
Easy way to protect a battery from charging
I am looking for an easy way to protect a battery from charging.
I have a one cell li/ion that should supply the electronic of a board with a connector usb c (one connector from the battery, one on ...
0
votes
1answer
42 views
What current should be used to calculated the drop across the diode? RMS current or average current?
I was designing a power supply, following is the output bridge diode current waveform from LTSpice simulation .
My intention is to calculate the power drop across the diode. What value of current (...
0
votes
2answers
121 views
A Drone 1900w led lightning flasher with a ssr problem. Help please
I'm a lighting technician that works in the UK film industry. I was really hoping some one could help me with a SSR switching issue.
I have built a led lightning flasher to simulate storm lightning ...
1
vote
2answers
69 views
Protective diode across dump load
I have a rectified DC Voltage and I will switch in a dump load resistor. I have a 25PV045 Schottky diode connected across it as a flyback to deal with the inductive properties of the load when the ...
0
votes
1answer
91 views
What the difference between pin and pn diodes i-v curve?
For my understanding there should be no big difference in i-v curve between regular p-n junction and p-i-n junction, the only difference i can think about is do to the bigger resistance of the ...
2
votes
1answer
104 views
Is a MOSFET's body diode different than an ordinary silicon diode at audio frequencies?
So a friend of mine asked me to evaluate how hard would be to build a guitar effect like the ones described in this thread. The pedal in question is a customization of the Ibanez Tube Screamer. The ...
0
votes
1answer
75 views
What is the function of diode and capacitor in RS232 shifter circuit?
as shown in the picture, can anyone explain the capacitor and diode in detail? Thank you!
-2
votes
2answers
124 views
What is the purpose of the transistor in the following circuit?
I'm a beginner, this question might be silly, but please bear with me.
What is the difference between the two following circuits,
What does the transistor do? The LED glows in both the cases if we ...
1
vote
2answers
62 views
Different logic levels on single input
I have a circuit that has about a 1V input that gets boosted to 3.3V.
To enable the boost converter IC, a switch is pressed which causes the enable signal [EN] of the converter to go high (and stay ...
1
vote
1answer
92 views
Confusing regarding measuring barrier potential of a pn junction using a voltmeter
I have been trying to understand why we can't measure the Barrier potential existing in an unbiased pn diode but on seeing the answers I am quite confused.
There seems to be two answers to this ...
0
votes
0answers
107 views
Does anyone recognize this diode? Or manufacturer?
first post! I found this diode (a pair actually) at the bottom of a parts bin at a local surplus store. I was intrigued by the markings; I've never seen a white painted diode, or the "TN" (or TZ?) ...
-1
votes
1answer
93 views
I want to to charge a capacitor with rectified mains voltage BUT
But when I make the connections the house fuse just blows.Capacitor values is 3000uF 450v. When I measure the voltages of the rectified (bridge) mains, I get a reading of 207VDC and 80VAC
(ı think its ...
0
votes
0answers
53 views
Sizing a Freeflowing Diode for solar charging application
I have been having trouble with my solid state relays dying. After further research I need a free flowing diode on the load side of my charging application. The diagram is below. I'm not an ...
2
votes
1answer
160 views
How are glass diodes produced?
What I am trying to understand is how the diode is placed inside of the encapsulating glass container such as that pictured in the following:
I've tried to read some patents, where I more or less ...
0
votes
2answers
101 views
Momentary Switch NAND Latching IC Burning and (Possibly) Faulty Logic
Problem:
My issue is that the momentary switch with NAND latching logic that I have designed is not functioning consistently. It does work as intended at first, but then fails to work after repeated ...
1
vote
1answer
85 views
Need equivalent for diode
I could not find the datasheet of this diode. I need an equivalent, could you help me?
0
votes
1answer
73 views
How to find relationship between switching energy loss, temperature and current in an IGBT
I am calculating the losses of an inverter in Simulink. I used 'IGW25N120H3' IGBT for the inverter.
In the datasheet, they have mentioned switching energy losses for 2 different temperatures and from ...
