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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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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53 views

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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41 views

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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411 views

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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4answers
125 views

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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0answers
59 views

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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1answer
53 views

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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2answers
397 views

How do zener diodes regulate voltage? [duplicate]

So i read about the Zener diode voltage regulator circuit in the The Art of Electronics book, it made no sense to me, then I read about it in this article which was ...
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1answer
41 views

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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1answer
61 views

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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2answers
63 views

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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3answers
59 views

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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29 views

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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1answer
98 views

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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0answers
21 views

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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6answers
650 views

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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2answers
643 views

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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2answers
62 views

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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1answer
62 views

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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1answer
37 views

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 ...
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1answer
70 views

OpAmp circuit with diodes: conduction conditions

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 ...
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1answer
570 views

What's the purpose of this diode in this level-shifter?

look at this circuit: I don't get that what's the usage/purpose of the BAS316 in this circuit?
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1answer
80 views

A question about parallel diode configuration

In a textbook when mentioning a setup to measure a simple 10uA ammeter's internal resistance, they recommend to connect two diodes with opposite orientation in parallel with the (ammeter). The setup ...
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1answer
95 views

How can CAN transceivers ouput CANH=3.5V and CANL=1.5V?

When sending a dominant bit (0bit) on the CAN bus, I understand that CAN transceivers output CANH=3.5V and CANL=1.5V. But when looking at the schematics of a CAN transceiver, I do not understand how ...
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6answers
1k views

How to memorize a diode's polarity in symbol? [closed]

How to memorize a diode's polarity (Such as anode and cathode) in symbol?
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2answers
131 views

How to connect flyback diodes on a h-bridge [closed]

I'm using a SN754410NE h-bridge to drive two DC motors (4.5V each) with Arduino. After testing the circuit and the code, I made a standalone Arduino on a perma-proto breadboard. My problem is that ...
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1answer
45 views

Find the Vo at Vs = 10V?

In the above Question, I am not able to judge the states of the Diode when Vs is at 10V. Can somebody can explain me, how we can proceed in order to find the Vout.
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1answer
29 views

Diffusion Capacitance: Forward Bias

Please see attached image. I'm struggling to understand how the book went from line 2 to line 3; it doesnt seem obvious how they did the differential. Thanks
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4answers
493 views

Lower than 0.7-0.6V voltage drop on sillicon diodes

I am trying to understand how voltage drop happens. From what I know, there should be about 0.7-0.6V drop across a silicon diode. This is exactly what happens when I remove the LED from this circuit. ...
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62 views

How to Read STMicroelectronic Schottky rectifier marking code

I need to know the value of a Schottky rectifier shown in pic. I tried ST site but still unable to find it. Please help me.
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1answer
38 views

Bulk Capacitance and Inrush Current Limiting Diodes burn for PSU first stage

I've been trying to get the first stage of my power supply working for some time so that I can move on to the more interesting Voltage regulation circuitry for my variable bench power supply. After ...
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1answer
28 views

Schottky diode equivalence in RF wattmeter?

I think I may have fried D1 in the circuit below, if that seems plausible? (During my initial testing, with up to 15W of input power, I had an open circuit after R4. I really don't understand how this ...
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2answers
70 views

5/12V voltage TTL selector

I want to select an output of 5 or 12 V with an isolated digital output control signal (Vcc 3.3V in the picture, 0 selects 5V, 1 selects 12V). Right now I have something like this: Corrected version:...
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4answers
251 views

I need the full range from an LM34DZ, but I don't have an 1N914 diode. Is there a replacement?

I want to read the full range on my LM34DZ, but I can't seem to find any 1N914 diodes. Is there anything I can replace it with?
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2answers
65 views

Damaged glass shield of diode

I was repairing a PCB, when I noticed that a diode is damaged. The glass shield is missing a piece but the gap is still covered. Is the diode still ok? I don't know how to replace it since part of ...
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2answers
64 views

Why a diode is in parallel with the current source in the equivalent circuit of a solar cell?

The model of a solar cell has a diode in parallel to the current source: (source) Why is the diode in parallel and not in series with the current source?
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3answers
83 views

DIY mixer - use diodes to prevent input potentiometers influencing each other

I've builded a simple amplifier (just stereo audio in, two speaker outs) and I'm building a mixer for it. There are some audio inputs, which goes through stereo potentiometers (volume for each input)...
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2answers
82 views

Diode Clamp failing with LDO Circuit

I'm back with yet another mystery. Summary question: Why would an input to a voltage clamped circuit de-stabilize and or elevate that voltage clamp's upper rail? How do you properly clamp voltage ...
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1answer
89 views

How do you size the correct diodes for OR application of two power supplies? [closed]

How do you size the correct diodes needed to OR two 12V 1.25A power supplies? What voltage and current rating do the diodes need to be?
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1answer
46 views

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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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
73 views

What type of 555 timer circuit is this [closed]

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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1answer
47 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
29 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
57 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
86 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
58 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
175 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
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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 – ...