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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Directly Power STM32 from Lithium Battery

I'm putting together a wireless sensor node and it's running a STM32L051 which can run at a 1.65-3.6v range. I've also got an RFM69HW radio onboard which can run at 1.8-3.6 (2.4-3.6 for full power ...
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2answers
37 views

Diode Bridge with differential voltages. Transfer function

Hi, I've been struggling with this problem for about an hour and I just don't know how to determine the transfer function for this circuit. My first attempt was analysing how the circuit behaves ...
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1answer
43 views

Clipping circuit simulation producing unexpected result

I am playing around with a clipping circuit to protect a adc on my microcontroller. I beleive the following will work, but when I simulated the circuit I saw something funky. Any ideas on why adding ...
2
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1answer
53 views

LDO with supercap and diode circuit

I'm looking for an alternative for a backup battery i'm planning to use. PCB is powered by 24V DC power supply. I'm using a 3.3V LDO in combination with 3,6V battery to power mcu and other components ...
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1answer
23 views

Write V_final in terms of V1

simulate this circuit – Schematic created using CircuitLab Being \$V_1=10\sin(100t)\$ and \$V_D=0.7\$V, it is asked to find the output potential as a function of \$V_1\$. I made: ...
8
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2answers
134 views

What is the purpose of input protection on USB (or at all)?

I have seen quite a bit where reverse biased diodes are used to clamp input voltages when spikes occur. What is the typical reverse breakdown voltage for a diode used in this type of application? ...
6
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5answers
732 views

How is it possible for voltage to exist when only a single voltage source terminal is connected?

Please take a moment to look over the circuti below: As you can see, the circuit is nothing more than a 10 volt power supply and a diode. Note that the power supply negative terminal and the diode ...
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1answer
27 views

Can diodes be used as an OR gate when I use RTL for other gates?

I have been using RTL (Resistor-Transistor Logic) to build things like NOT gates, or any other types of logic. If diodes control the flow by letting electricity only flow one way, then could I use two ...
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2answers
48 views

Diode parallel to resistor on H-Bridge MOSFETs gates

I was looking at a TC4467's gate driver datasheet and there is one thing there that I haven't seen before when reading about H-Bridges. On the schematic of example H-Bridge motor control there is a ...
0
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1answer
31 views

Constant Voltage model pf Diode circuit analysis

I have solved this problem assuming an ideal diode model, but now I'm required to use the \$0.7\$V constant voltage model. If the same circuit in ideal model had both \$D_1\$, \$D_2\$ conducting, does ...
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1answer
22 views

diodes circuit analysis problem

simulate this circuit – Schematic created using CircuitLab assuming the diodes are silicon diodes (o.7 volt) which one is on/off and why , and what is the current through or voltage cross ...
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1answer
17 views

Minority Carrier Diffusions Equations in the derivation of Shockley equation

I am trying to get an intuitive grasp of the derivation of the ideal diode equation and I am struggling with a couple assumptions although the math itself looks pretty straightfoward. I am ...
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0answers
28 views

Diode at reverse biasing

Why the electrons don't move that way : giving that : 1- if the electrons of n type managed to get to p type and electric field will help them circulate again as electrons flow against electric ...
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0answers
47 views

Diode as variable capacitor

I'd like to ask about: Regarding the diode as variable capacitor, I've read that at reverse it will acquire more charges in the depletion region but imagine we did so then remove the diode from the ...
0
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1answer
39 views

Using a diode to lower supply voltage to nrf24l01+?

I was wondering if I could use a IN40007 diode (or Zener diode) instead of a 3.3V voltage regulator. I plan to power the module using a 3.7V LiPo. Since the battery would be 4.2V when fully charged, ...
0
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1answer
24 views

BZY97C47 zener diode datasheet questions

The BZY97C47 data sheet (I found no direct PDF link) confuses me on several points. I fail to find straight forward information about the maximum allowed forward current from the data sheet. Also, ...
1
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1answer
74 views

What happened to my second half cycle of my half wave rectifier?

When I'm doing a simple half-wave rectifier with the set-up as shown above (Note: Diode D2 is not connected) and connected terminal 5 and 4 with positive and negative terminal of oscilloscope, this ...
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0answers
67 views

TVS Diodes Exploding, how can i suppress transients?

I am using a TVS diode to prevent the switching transients taking my capacitor above 75V to prevent my dc-dc converter being damaged. However the TVS is dissipating way to much power and exploding ...
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0answers
45 views

Zener diode design

Design DC voltage regulator for 6V output. Given data are Vz= 6V at Iz = 20mA, Izk=2mA, Pzmax=500mW and rz=20ohm. The input voltage varies between 9.6V to 14.4V DC.Find the voltage regulation factor ...
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38 views

Discontinuity in I/O characteristics

I've have been trying to figure out that problem and checked the answer and found a discontinuity in the I/O graphs is it possible ? and what is the physical meaning ?
2
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1answer
58 views

How does dumping excess voltage works?

Sorry for this basic question but I am not finding a simple answer to it Lets say we have a input signal(a node) that we expect to be in the range from 0V to 5.4V. To make sure that it never exceeds ...
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2answers
51 views

Op-amp non-inverting amplifier with clamping?

I am designing a simple electret microphone amplifier for use with Arduino. My current design is shown below: I was wondering if there was a way to combine the diode clamp (D1 in the schematic) ...
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2answers
84 views

A simple pulse generator

Basically, I want a minimalistic pulse generator. I guess I've always like the idea of Avalanche Breakdown to do this. I was trying to do this by using 2N2222's in reverse breakdown mode, link here, ...
2
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1answer
83 views

Is there another way to think of/draw this simple diagram?

I'm not too familiar with this "not-fully-connected" type of diagram, and so understanding it is giving me some trouble. How do I approach determining the following circuit's characteristics (i.e. ...
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2answers
85 views

How can I make the dimensioning of a temperature monitoring circuit?

I need to design a circuit to measure temperatures in the range 15-40 degrees C (this will later be the basis for a regulator of a peltier-element for a fridge). I tried a circuit using the ...
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0answers
21 views

Diode selection or “Engine Running Only” electrical source on 1965 Mustang? [migrated]

Good Morning, I am working with a 1965 mustang and have added heated seats. The seat heater wiring does not have a latching circuit and is controlled by a SPDT Hi/off/Low switch. In an effort to only ...
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1answer
49 views

What is the second component?

The second component on the board says Diode CKT. What is that? Doesn't the left handed side of that component look like a resistor?
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2answers
48 views

Determining if a diode conducts or is cutoff?

Can somebody please explain to me how you exactly determine whether a diode conducts (shorted) or is cutoff (opened)? I found a couple of posts on this but I wasn't able to justify the answers ...
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2answers
62 views

why the PIV of full wave rectifier is 2vm

Peak inverse voltage (PIV) is the maximum voltage a diode can handle in reverse bias condition. Why does the PIV of the diodes in a full wave rectifier need to be 2×Vm? (where Vm is the peak ...
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1answer
49 views

Design the circuit such that the output voltage is 2.4V

How would I figure out the value of R? How would i analysis this circuit?
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1answer
37 views

Active electric motor for on specify voltage

Is it possible to power on electric motor ( a little ) only when the input voltage is 1V by example. The electric motor is supply by another source (9V by example) With diode?? Or something else? ...
0
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2answers
93 views

Diodes in parallel circuit analysis

Could some please help me understand why D2 is on and not D1 on a) and why is D1 is on and not D2 for b). This is for ideal diodes
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1answer
60 views

Building a micro generator, I need to account for the pulsing DC after my 3 phase diode bridge

I wound my own motor, and tested it to be about 300 RPM per volt, and if my noob math is right, it should be able to handle about 1600 watts with a ~40 volt supply without burning my nice but thinly ...
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2answers
123 views

Why does my LED blink when too much voltage is applied?

I bought a set of simple light-emmiting diodes. Connecting one to Arduino's full 5V output (without a resistor) causes the diode to blink. However changing the duty cycle to a value below 80% causes ...
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1answer
66 views

Diodes question is this correct?

We have the diode circuit in the figure. The diodes are real and Vd=0.7 Volt I have to find the currents in the diodes and in the resistances R1 and R2 So I apply KVL in loop 1 and I have -20+ ...
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1answer
44 views

What Diode have I here?

I am trying to figure what is with my broken power adapter (230V AC -> 12V + 5V DC at both 2A). After checking the fuse, now I extracted two heavily cooled diodes, which could be the cause. But I ...
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2answers
72 views

Diode: reverse and forward bias current and voltage

The question asks : "Assume that diodes have voltage of 0.7 V and resistance 4Ω. Find the current through the forward and reverse bias of diodes. Draw the characteristic of diode through the given ...
0
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2answers
62 views

How can I make a log amplifier's logarithmic region span across the range of 0-5V input instead just working close to 0V?

I need to implement a log amplifier. Currently I'm doing it using a diode in the negative feedback loop but it only really gives me the log response close to the zero input, with the amps output ...
2
votes
1answer
60 views

Is there a simple circuit which would behave similarly to a diode, but with a higher cut-in voltage?

I was wondering if there exist any relatively simple circuit which would have an I-V characteristic similar to that of a diode (i.e. exponential but small before the cut-in voltage) but with a higher ...
0
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1answer
88 views

Why diodes are made up with semiconductor?

I am little bit confuse about 'Why diodes are made of semiconductors'. I know the properties of semiconductor and also know the process of doping but still confuse to get the answer. Why the making of ...
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2answers
57 views

Use of MOSFETs body diode

I have an N-MOSFET array IC and I don't need to use all of them, but I do need to use a diode. Is it OK to use the body diode of one of the MOSFETs as a regular diode to decrease component count and ...
0
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2answers
88 views

How to design capacitance value for a given full wave rectifier [duplicate]

I have been searching for design equations for 5v regulated power supply but unable to figure it out. Please check the below circuit diagram Could anyone explain me why 470uf ? why not 2uf? how can ...
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1answer
69 views

DC motor working on Arduino but not Attiny with batteries [duplicate]

I have a simple working circuit to control a DC motor with an Arduino as indicated in the Arduino examples. For instance, ...
0
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0answers
61 views

ideal/non ideal diode design using Multisim

I am design the following circuit using Multisim, but I came across a problem. I used 1N4004 for ideal model, but I have no idea what would be the model for non-ideal ( ideal + 0.7 V). or I just ...
0
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2answers
84 views

BJT Switch with a Diode from Base to Emitter

In this circuit, the diode is supposed to force a higher input voltage to turn the LED on, however when I created it on a breadboard I measured about the same input voltage (without the diode) to turn ...
0
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1answer
64 views

Trying to understand flyback diodes and general diode orientation

Let's start with this: I know the top image is of a flyback diode. I also get that its purpose is to protect the power supply from a voltage spike when the electromagnet releases. So I've gotten ...
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3answers
89 views

Calculating voltage in diode circiut

Could you explain to me why U_out is -4,4V and only 3rd diode is open in the following example? Given that R is 10kOhm. My physics resistant brain tell me that voltage at each anode is is 10,15 and ...
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4answers
76 views

LED Voltage Drop Confusion

Please take a moment to checkout the simple circuit below: simulate this circuit – Schematic created using CircuitLab As you can see, this is a simple circuit consisting of three LEDs in ...
0
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1answer
99 views

Reduce power supply voltage

I'm trying to build the power supply described here. R1: 1K8 1/4W Resistor C1,C2: 4700µF 25V Electrolytic Capacitors D1: Diode bridge 100 to 400V, 1.5 to 4A D2: LED Any type ...
3
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2answers
134 views

Precision high speed peak detector

As a follow-up to my previous question, where I seek to determine the amplitude of a 2 MHz sine wave, I've settled for an op amp based solution. To recall, my input has a maximum 240 mV amplitude -- ...