# Tagged Questions

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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### LM317 vs series diode (1N4007) as voltage regulator?

I am using the SIM900A GSM module which requires 3.2V to 4.8V with max current draw of 2A. In my board, I have a 5V, 3A supply which will be used to power the SIM900A. Generally, in my search I ...
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### Proof that every circuit with diodes has exactly one solution

Consider an electronic circuit consisting of linear components plus a number of ideal diodes. By "ideal" I mean they can either be forward-biased (i.e. $v_D=0$ and $i_D\geq 0$ ) or reverse-biased (...
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### What is the purpose of the diode in this diagram?

If a diode causes resistance then the path of least resistance would always be to ground. So what is the point of this diode?
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### How holes and electrons in the diode gets back to their original position when it is turned off?

When diode is turned on the holes and electrons gets mixed that is the holes will also appear largely on the n side and electrons also appears on the p side but when turned off how electrons and holes ...
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### Choosing the right diode for a 9v circuit with npn transistors? [closed]

I'm super naive to this field, so pardon me if i sound stupid. i'm building a guitar stompbox and i want to use a diode to be sure the signal doesn't go backwards. how do i pick the right diode? are ...
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### How do I compute the average and RMS of a series of triangular pulses?

I'm trying to calculate the Average and RMS values of the current through a diode with the waveform image attached. I'm struggling to work out which equations to use. Any feedback would be appreciated....
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### Does LiPo4 battery amperage output increase as voltage decreases from 4.2V to 3.57? I'm trying to size up a diode [on hold]

I'm trying to determine the max amp output of a battery pack that has 28 cells in it. To be more specific towards what I'm doing: I'm trying to size up a diode for the charge port; the battery charges ...
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### What is the function of the diode in the image?

I am buildind a circuit like this, but I am confused about D1, is it necessary?
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### can a simple diode and resistor in series qualify as an inverter? [closed]

I'm working on a single-sided PCB and I find transistor pins are too close together for tracks to run through, so I'm wondering if I could roll off my own inverter by using the cathode of a diode as ...
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### Reverse Polarity & Load Dump Protection (TVS)

Based on this and other material I’ve read, I should have a diode for reverse polarity protection and a TVS for load-dump protection in an automotive circuit. I have prototyped the circuit and its ...
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### Using diodes to channel battery charging current

I have a setup with Solar PV, battery, inverter, and AC load. Between the battery and inverter I have connected a custom circuit with DC power/energy/charge measurement, and a relay. Problem is, ...
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### Class D Output Stage - MOSFET turn off diode

I am currently working on a class D audio amplifier. During this process I've come to have a pretty decent prototype, which I now wish to improve. In this manner I wish to improve especially the ...
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### How does current get into a diode?

I think I understand more or less how an ordinary semiconductor diode works: Crystal doped differently in different regions, carrier depletion where they meet, bla bla bla. However, actual diodes ...
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### What does the diode in this D flip-flop “One-shot” do?

Does this diode help discharge the capacitor once the flip-flop is reset? Thanks in advanced. (Image was taken from http://educypedia.karadimov.info/library/oneshots.pdf)
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### IR emitting diode chip angle of half intensity confusion

Datasheet of IR emitting diode chip TS8514VA from VISHAY states that the chip typical angle of half intensity is 55 deg. But the plot of radiant characteristics in Fig. 2 show that the half ...
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### Why is breakthrough voltage of a TVS-diode decreasing when in parallel with an inductance

in our lab we are testing a circuit which has an inductance and a TVS-Diode in parallel. The task is it to determine the breakthrough voltage of the diode. The test works like this: We apply a ...
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### Need help with Laser Driver Voltage with Specific 3-PIN Diode

Thanks for reading. I was hoping someone could help me with the electronics of my project. So I am trying to drive a L980P200 - 980 nm, 200 mW, Ø5.6 mm, A Pin Code, Laser Diode. Link to spec sheet ...
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### What typ of Diode would I use ? I don't know much about Electronics.

I have a motorcycle that is running a 12V system. My question is, What type of diode would I use for my cooling fans for my radiators. The power comes from the ECU on my bike. I want to install ...
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### Narrow TVS margin between operating and overvoltage

Devices like the PIC16F18323 have an extremely narrow margin on I/O pins. The standard logic-high voltage level is 5V, but the absolute maximum is Vcc+0.3V, i.e. 5.3V. Reading about TVS devices, in ...
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### Why to use a Schottky diode instead of a normal diode on a solar panel?

I see all forums recommending using a Schottky diode instead of a "normal" 1N4007 diode on parallel with each solar panel cell. Why a Schottky? You don't need speed here. And the voltage drop is about ...
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### USB & 12V-Power-Supply simultaneously - Diode?

I'm currently designing a (fairly easy) circuit, which is powered by an ordinary 12V Power Supply. To flash the embedded µC and/or get debugging output, I use an onboard USB-UART-Interface. To make ...
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### What can I use to replace an SV-04F bias diode?

I had a nice Wega V3840-2 audio amplifier, but sadly, it broke. During my attempts to test what was wrong, a diode, attached to the heat sink, failed with a nice whiff of magic smoke. According to the ...
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### Can anyone tell me what is the purpose of diodes at the output of a chip?

I am new to engineering, and now I am puzzled. My friend bought the product and he gave me the circuit diagram. But I don't know the purpose of diodes D10-D17. Can anyone give me an answer?
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### Decaying envelope when audio passes through diode

This is a basic question about passing AC (audio) signals through a diode. I'm trying to use an audio signal to power an LED (which in turn heat-shrinked to an LDR) in order to control the behaviour ...
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### Circuit Partial Failure

We are working on a circuit which appears to be failing during operation due to heat (putting a fan over it keeps it running). We have narrowed the possible parts down to a power resistor and a zener ...
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### How do I limit voltage from two power sources?

I am designing a system to mist my outdoor air conditioning units during the summer. I will be powering a low voltage irrigation value using the low voltage from the AC controls - 24 VAC. I have 2 ...
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### Burnt SMD diode identification. General Semiconductor S4 6CA

I have an Artesyn 7001138-Y000 835 server power supply unit that has a burnt component. The burnt component reads S4 6CA and has the general Semiconductor logo on it. I have been looking online to ...
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### Minimum Voltage for Forward Bias Diode

I am trying to understand how Diodes work. Specifically the physical details. With a PN diode, assume we connect a battery in a forward bias setting (The negative side of the battery to N and the ...
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### Is it possible to repeatedly use a schottky diode at its surge current without damage

I've been working on a circuit with an inductive load and a MOSFET, but I'm having trouble finding a suitable freewheeling diode. If I choose a diode with a maximum surge current higher than the ...
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### 1N270 Spice Model

Does anyone have the spice model for the 1N270 Germanium Diode? I have found several online libraries of spice models for diodes, but none of them have the 1N270. A google search didn't find it, ...
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### Is “catch diode” the correct term to use in SMPS context?

UPDATE: Ok, two good answers, I've chosen the one with more votes as the "right" answer, leaving it to the wisdom of crowds to choose between two fine choices. For anyone who cares, I think I'll ...
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### Model for Diode Shows Voltage Increase not Drop

It's well-known that if a diode is forward biased at a sufficient voltage, there is a voltage drop across the diode, i.e. it dissipates power. However, I was reading Wikipedia's article on the ...
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### What is the difference between red glass diodes and blue glass diodes?

I have some old hermetically sealed glass diodes that have a blue color under the glass, which is different from the red ones that I normally see. Does anybody know what the difference between the red ...
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### one-way RF signal diode

Is there a special diode or band pass filter that will only allow RF signal to go though a wire in one direction like a diode does with electricity?
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### How big does the Schottky Barrier or Band Offset have to be for a junction to be a diode?

Current rectification happens when there is a large Schottky Barrier or a large Conduction band offset (excluding cases such as tunnel diodes). My question is, how large (in electron volts) does the ...
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### Motherboard RGB diode control and resistance?

I've recently acquired a new motherboard for my PC which features RGB strip control. That's well and good but I have particular need to control a single RGB diode with that same header. The issue I'...
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### Will light turn on in a closed circuit for a moment if a diode stops electric current after light source is reached?

I drew an example of the closed circuit I was thinking of for my question. Below I have the diode stopping the electric charge after it has already passed through the light bulb. My assumption is that ...
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### Does N-type or P-type semi-conductor show electrical effect?

I am reading the book Electrical Engineering 101. It's a book of basics for not-so-newbie. It contains below description in Chapter 3: A diode is made of two types of semiconductors pushed ...
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### Operating frequency of RD15VHF1 and 1N5822

I am currently building an inverter circuit and a rectifier circuit. I proposed to use RD15VHF1 and 1N5822 in the circuit because my target is to operate the circuit in the range 500kHz to 1.5MHz. In ...
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### Current, when Zener and normal diode in parallel? (picture inside) [closed]

1.) What are the currents , I1 and I2? And why? 2.) What are the currents here (when the diodes are the same): Thanks.
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### How to measure fast transient capacitance response

I would like to measure a fast transient capacitance response of a diode when switching from forward to reverse bias. There are commercial instruments available to do this, such as the Boonton 72 or ...
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### Rationale for operating the diode in the (reverse biased) breakdown region

For the circuits I've studied thus far involving diodes (which admittedly are not that many), they have been nominally used in the forward-bias mode. For example, the LED only lights up when it's ...
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### Trouble with rectifying a pulse with a diode

I'm trying to obtain a pulse from a square-wave of a function generator. I thought it is an easy straightforward thing. So in this case the square-wave is +5V to -5V. I use a 1N4001 diode and a 220 ...
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### What current rating does my kickback diode need to have?

This seems like it should have been asked before, but I can't find anything. I've got a large 12v DC motor (11A startup surge, 7a running current) that I'm PWM-ing at ~20khz through a mosfet. I, ...
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### How to Build slayer exciter

i am trying to make a slayer exciter .i am using this diagrm http://www.instructables.com/id/How-to-Build-a-Slayer-Exciter/step2/The-Driver-Circuit/#step1 but I used components like TIP36C(PNP),5oo ...
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### How powerful(in terms of output watts)can current Gunn diodes get?

That is, if I wanted a Gunn diode in the low GHz range with a 20kW output does such a device exist? If not what kind of semiconductor materials would be needed to support ballistic transport at high ...
Consider the circuit below, where $\ v_2$ is an arbitrary input voltage and not necessarily equal to 3V as in the image. Both diodes and the OpAmp are ideal. If only diode 1 is conducting or if ...