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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Need assistance in choosing diode for seat heater circuit

Background: I have been working on car seat heater circuit. I purchased the universal seat heater with manual 2 level (high and low) switch. Instead of manual switch, I re-wired the seat heater ...
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79 views

ideality factor diode > 2 possible?

Using non-linear regression I have worked out the ideality factor to be greater than 2 (2.04987187490894) using spreadsheet software. Is this realistic for a diode. Is the maximum ideality factor ...
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43 views

Diode Ideality Factor using Non Linear Regression (matlab) [on hold]

I want to find the ideality factor from the experimental data of a diode. I have obtained 10 I(sampleY) and V(sampleX) values, and used matlab stats::reg function ...
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55 views

Freewheel diode / capacitor with this board?

With DC motors, it is common to put a freewheel diode and/or a capacitor in order to protect the equipment as the motor can induce current into the system. I plan to use this board to control a 24V ...
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56 views

Maximum forward current on ESD diodes

I'm interfacing a dsPIC33EP512MC806 with a set of analog systems. The analog systems manage a battery and have vregs for the digital systems. The analog systems measure the voltage and current ...
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89 views

Can I ignore resistor for IR LED?

I have two IR diodes and I want to connect them to my Raspberry Pi. From Pi I have 3.3V voltage. Diodes are TSAL 6200 . Can I connect them to PNP and my PI without resistor safely with this wiring?
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129 views

Why is this diode here?

I am building a VU meter. Searching in the Internet and coming up with some things on my own, I ended up with the following circuit First, there is an amplifier whose role is to give the VU meter ...
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48 views

How to analyze this diode circuit for a resistance?

I'm sorry for posting a textbook question, but it does not provide any explanation and I am pulling hair trying to make sense of this. I tried converting each of the diodes to a 0.7V DC source with ...
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72 views

Why do we need to rectify or amplify the current/voltage? [closed]

I am a beginner in Electronics. What i read now a days in my text book is about diodes,transistors etc. They are used for some rectification and amplification etc ? I wonder why do we need to give ...
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29 views

Diode preventing coil from latching?

So I've come across a case where an input from a little 5v I/O system will trigger the coil of a reed switch but not it's direct equivalent that has a built in flyback diode and changing the resistors ...
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72 views

Replace some LEDs with Diodes [closed]

I have a COTS solar battery charger that has a number of different LEDs identifying the battery level, if its charging, etc. Its going to live in the shed, so 99% of the time no one will see its ...
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54 views

Why is wiring some LEDs in series better than wiring them all in parallel?

I noticed a lot of guides for making an LED array or matrix prefer to wire their LEDs in series first and then wire strips of leds in series in parallel. What is the benefit of this Vs wiring them all ...
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58 views

How to approach diode circuit analysis (novice)

In my microelectronics course we have just begun learning about diodes and semiconductor physics. We have been analyzing simple circuits with diodes, mostly solving for component values. The approach ...
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57 views

Built in potential of a pin diode?

I'm not sure how the addition of the intrinsic region affects the built in potential of the diode. I also can't seem to find any information about it online. Thanks for the help. How does the built ...
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1answer
86 views

Does a zero-recovery diode really have literally zero recovery time? If so, how?

Some diodes are advertised as "zero recovery". Is this true? Or is it marketing speak for "so fast you couldn't possibly care"? If it's true, what makes a zero-recovery diode fundamentally different ...
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70 views

Bulletproof ESD Powersupply Inputs

I have a power amp that is essentially functions like a benchtop supply, and you can connect banana plugs into it. I would like to protect it against ESD, but also protect the amplifier. People in our ...
2
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1answer
80 views

Creating a robust power MOSFET switch

So I have been researching about protecting a MOSFET. I have used MOSFETs for basic on/off switches but never really thought about fully protecting them. I have used them for on/off switches to engage ...
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0answers
55 views

Suitable Schottky (Dual) Bridge Rectifier ICs to protect stepper motor drivers [closed]

I need to protect a number of 24V stepper motor drivers from cable disconnects as described in "Adding diodes to easy driver stepper motor driver". This means using eight Schottky diodes with a ...
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1answer
128 views

Why do Schottky diodes have two anodes?

I was looking for a SMD diode to add reverse-polarity protection to a circuit I was designing, and the PMEG3020CPA looked like a good fit with regards to my current and voltage needs. What confused ...
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51 views

How can I derive a voltage equivalent without affecting the output?

In the above schematics, I want to make the equivalent of the circuit on the left side. What I mean is I want to derive V2 from V1 and get rid of using two supplies. I want to derive V2 from V1 by ...
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1answer
210 views

Why does this zener diode fix the voltage to the LEDs?

I am just getting started working with small electronics. I have soldered together a few kits and recently converted a car stereo into a home stereo. With all of this soldering, I found this ...
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2answers
92 views

What are the real properties of an ordinary LED?

I would like to simulate a typical LED in MATLAB. However, I need the following info: Internal resistance (in Ohms) Internal capacity (in Farads) Self-Inductance ( in Henries ) All of the values ...
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75 views

Type of diodes for a particular application

Read some of the other answers, some of them are not easy to read (I'm not a specialist), some others do not fit my application. A pretty simple system two brushed motors, each takes between 12V to ...
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82 views

Can anyone indetify this SMD component?

This is from N9005 phone and i would love to know what SMD component is this. Here is a photo. Thank]1
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3answers
135 views

Is the MOSFET source always connected to bulk?

I'm trying to understand all the basic connections of a MOSFET. These questions may seem very basic but I have flipped every single textbook I own and googled every single website and never found a ...
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1answer
79 views

NPN transistor is always on

I'm completely new in hobby electronics, and I assembled the following circuit to control a power LED over wifi using esp8266. The problem is, that it is always, on no matter, what I send via GPIO1 ...
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156 views

long wire kickback voltage problem

the long wires acts as inductor which shutdown and sometimes damage my microcontroller(IC1), for the AC part ill be implementing an optoiso along with triac and snubber circuit (lemme know if you ...
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1answer
57 views

SIM900 CR2032 rtc battery backup

I would like to use a CR2032 battery to power the internal RTC of the SIM900 gsm module. The datasheet (given in the link) says that the battery should be rated at 3V. They also give the following ...
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42 views

Testing a power chain with a microcontroler

A microcontroler is powered by a double power supply. Each of them is composed by a battery, a voltage regulator, and a diode to avoid current flowing from one side to the other. Here's a schematic. ...
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59 views

The diode and the relay question

Do I need to use a diode with the following setup ? What i want to do is activate a relay which then closes the positive side of a nema 5-15 portable receptacle and allows electricity to flow. When a ...
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131 views

Two-sided connectorless USB on a PCB

This question is inspired by Connectorless USB on a PCB. I saw a cool USB LED on AliExpress that can be inserted in either direction: I'd like to build a board with a similar symmetric ...
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37 views

RL and RC circuits with ideal diodes

Can you help me with this problem? what is V(t) before t=0 ? And also, any hints on how to solve the problem. This is not homework. I'm studying for a final exam and I'm really stuck. So if anyone ...
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70 views

Op-amp and ideal diode problem: determine Vout as a function of Vin

"Determine and graph v OUT as a function of v IN for the circuit shown in Figure 16.31. In doing so, model the diode as shown in Figure 16.29, and assume that the Op Amp is ideal. Also, contrast the ...
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41 views

Electron Flow Confusion

Using conventional notation in the diagram below, I understand that the circuit is not complete because the diode is in reverse bias. But knowing that the electrons actually flow from the negative to ...
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605 views

diodes blow with no load on full wave bridge rectifier

I have built what I thought is a simple first stage for a power supply consisting of only the full wave bridge rectifier (made up of individual 3A SMD diodes) and bulk capacitance. The moment I apply ...
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93 views

Transistors hooked up to one another

I stumbled upon a very badly drawn circuit on the interent which must be good . I have not been able to figure out how a series of transistors work in this circuit. It is depicted below. ...
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172 views

How to combine two chip enable(/CE) signals into one with discrete components?

My VIC-20 has a few bank select lines that are used for enabling ROM chips on the cartridge port. When one of them goes low, it means that a certain 8KB region of the address space has been accessed. ...
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62 views

Determining which diode I need [closed]

I have the following board with the below diode: One diode fails circuit testing and needs replacing, but how do I find out the specification of the diode I should buy to replace it? (it is for a ...
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93 views

Voltage Drop across Diode

I have a 6V input on my board. I need to put a load switch for USB 3.0 which needs 5V. I need to stepdown 6V to 5V using a series diode. 6V is going to other circuits also. Can someone suggest the ...
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1answer
38 views

Multiple laser diodes in series using a driver board

I couldn't find this in the search so I hope that I'm not repeating a question that's been asked already. I'm using a driver board that monitors the photodiode feedback in a laser diode to maintain ...
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66 views

LED typical and forward voltages

So, I was going through the spec sheet of super bright 5mm orange LED, and it was listed that the forward voltage is between 1.8V and 2.5V. Below that there was a property listed as 'typical voltage' ...
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126 views

Is this protection circuit designed properly?

I designed this protection circuit to avoid reverse polarity and over-voltage. Here is the circuit: simulate this circuit – Schematic created using CircuitLab Is the circuit designed ...
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110 views

How to chose a diode for breadboarding?

I use Rasperry Pi / Arduino as power source (5V,3.3V) and for input/output (GPIO, Arduino headers). I reached a point when I realized, that what's in my mind needs diodes. I'm building a morse ...
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104 views

How do I know if there is internal resistance in an LED?

So I have a circuit that seems to defy all that I know about LEDs. I cut apart 2 flashlights that run on one 1.5v battery each with a variable resistor (0 to 50 ohm) to change brightness. I am now ...
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49 views

How do I work out the total circuit Current?

I am trying to work out the circuit current so I can workout the voltages across my resistors but I don't know how to change the diode Which has a 0.6V drop into ohms so i can complete the formula. ...
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70 views

Sensing power supply - sensing after the on/off switch

I have a sensing power supply powering a custom build LED light for video. There is an on/off switch after the sensing lines and everything works well. The setup looks like this: However I'd like ...
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4answers
112 views

How much Should a Diode Read on a Multi Meter?

I'm trying to self learn all this stuff as I am a programmer not a engineer by trade So any help will be great. I have a Samsung TV Model : UA46B7000WF The Problem is that the TV blew a fuse which i ...
3
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1answer
80 views

Wien bridge sinusoidal oscillator

simulate this circuit – Schematic created using CircuitLab I would check that in the Wien bridge sinusoidal oscillator the gain A_V=1+(R5+R4)/R3) is actually A_V=3 as the Barkhausen ...
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If the current moves from negative to positive, are we placing the diode the wrong way? [duplicate]

I recently discoverd that the current moves from the negative to postivie, but if I placed a diode from postivive to negative it will work, but if I placed it the wrong way (from negative to positive, ...
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2answers
146 views

What is LED spatial distribution?

I was going through a 5mm blue LED data sheet and found this diagram in it. Couldn't figure out what it is.