Questions tagged [diodes]
Diodes are semiconductor components made from a P-type (or metal in Schottky diodes) and N-type material (usually silicon, but germanium, selenium, and gallium arsenide can also be used), that allow current to flow in one direction only.
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Effect of coupling factor in flyback converter relative to rectifying diode
I'm simulating a CCM flyback converter on ltspice, and I need some help in understanding the results when I decreased the coupling factor from 1 to 0.96.
When K=1, the voltage appearing across the ...
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How can I build a full wave rectifier with a grounded load without the use of a transformer?
I replaced the transformer with an AC source. If I only ground the load and not the AC source, it works. I have to ground the AC source due to the use of function generator in practical purposes. It ...
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Help with vehicle killswitch design
I am relatively new to electronics/electrical, and want to design a killswitch for my car, since it is easy to steal.
I have created the design shown below, which is intended to function like so:
if ...
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Why do the diodes make a huge difference in an RC sinewave generator circuit?
In the following LTspice simulation of a sine wave generator circuit, it cannot oscillate without D1 and D2, but as long as D1 and D2 are added, (1+R5/R6)=1.5 can also oscillate (as shown in the ...
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Analysis of the below op-amp circuit and its waveform
What will be the output voltage and capacitor voltage waveform for this problem?
[The approach I tried --> When the diode is ON, the negative feedback is complete and voltage of inverting terminal ...
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What is this part marked WH5 33?
What is this part and what is its part number? I can't find a part with the code WH5 33.
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Lightning cable bundle testing
I have two wires going to a solenoid. Power and ground. The wires are in in shielded bundle. When we apply a induced lighting voltage let's say waveform 5A, will both wires will be impacted equally? I ...
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Finding Is, Id of a Diode in reverse-bias mode
Excuse me, sir,
I'm currently finishing my lab experiment report but I got stuck finding Id and Is of a Diode in reverse-biased mode.
Here is the question: Vin is in the range of 0V to 18V with the ...
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Output diode selection to make 50Hz stick welder DC
I am fixing up a stick welder with a max output current of 240 A. DC welding has advantages in some jobs so I want to design/build a rectifier. My measured open circuit voltage is about 50 VAC, it ...
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How can I connect multiple 8V AC inputs into one earthed probe?
I am trying to design circuitry to connect 4 separate float-less water level controllers into one probe. Each unit needs to confirm that there is water in the tank and if not, will shut down. Not all ...
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Finding resistor and capacitor values for a snubber circuit to reduce diode's reverse recovery time
I'm trying to wrap my head around snubber circuits. I've read that the purpose of these circuits is to absorb energy coming from voltage spikes when a switch closes. We're currently studying snubber ...
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Flyback diode with 12 V/4 A water pump
I have a DC water pump (12 V/4 A) and I used a 1N4001 flyback diode connected with it in parallel. The 1N4001 only can handle max. 1 A constant current and 30 A transient.
Should I use a diode to ...
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Plotting input and output characteristics of diode circuits
I'm new to microelectronics and I'm having a bit of trouble with plotting the input and output characteristics of diode circuits.
Initially I practiced plotting the circuit circled in red. I do not ...
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Is it possible to write a sinusoidal steady state response of a RC circuit with diode involved?
Let's consider this circuit. When everything is ideal and the forward voltage of the diode is 0. When the current is going forward, the time constant is R1*C. When reversed, it is (R1//R2)*C. Is it ...
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Diode directed into the negative terminal of a sinusoidal voltage source
If my V_in is a sinusoidal voltage, what would be the V_out?
I tried to plot this in ltspice, however, I ran into trouble on where to connect the ground, on what node should I use to extract V_in and ...
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Diodes selection for High Side switch protection against inductive load
Hello I would like to design protection for HSD, BTS7200-2EPA against inductive load. Spec data for the inductive load is limited. But the PCB was designed for 2.5A peak, and approximate L and R_L ...
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Help me on this voltage divider question
There is only description of the circuit and a question.
In a voltage divider circuit powered by a 12V source, two resistors R₁ and R₂ are connected in series.
An LED with a forward voltage drop of ...
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Manufacturer of electronic components
I've a hobby, dissasembly old household appliances. I found this arrangement and i can'f find its datasheet. Does anyone know who manufactured it?
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Identify SOD882 diode marked F1
I am trying to identify a diode on a Turtle Beach controller. I can't find what diode this could be.
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Identify diode specs
I need help identifying this diode, I believe it to be faulty as I am getting a reading in both directions when testing with a multimeter. The markings are 3125. There is some discoloration on the PCB ...
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Intrinsic current of the diode, what is its current?
I'm having some difficulty finding the diode's intrinsic current, I applied some formulas, but I don't know if it's correct. Could anyone tell me if this is correct or why it is wrong?
If this is ...
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Why would an IV characteristic plot for a diode be linear and not exponential?
I was curious about the IV plot for a diode. My professor, and the internet, said it should "skyrocket" AKA be exponential after the knee voltage or forward voltage is met. So, I took the ...
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Will voltage at the inputs/outputs destroy an unpowered opamp?
I have a circuit powered by 12V that accepts an input signal of 0V to 10V. The circuit shall act as a buffer to the signal, with an added LED indicator. In certain circumstances, the circuit itself ...
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What is this shorted diode from a Bosch BMS for an eBike?
I am currently trying to repair a Bosch BMS from an ebike and found a shorted diode so far.
I can't figure out what exact model the diode is can anybody help me to identify it?
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identifying an SMD component (marked as 1J15)
I'm having issues identifying a SMD component (the one marked with "1J15"). The component is a part of a differential circuit breaker. Here's the picture :
Its length is 2.7mm. To me, it is ...
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Creating a circuit with negative differential resistance
Is it possible to construct a circuit with negative differential resistance by only using components that have no negative differential resistance (e.g., resistors, diodes, BJTs, etc)?
If possible, ...
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How to calculate diode forward voltage (Vd) for a MOSFET within a SEPIC?
I am in the process of selecting a MOSFET for a SEPIC. I require Vd in order to calculate the peak currents across the inductors, which are ultimately needed to calculate the MOSFET peak current, with ...
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Reverse Breakdown Voltage for a diode
Could anyone explain why is the reverse breakdown voltage measured for a general diode? Diodes work in the forward biased region. Then why is it important to know the reverse breakdown voltage?
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Oring Diodes: is RC discharge circuit needed for prevent disconnection issue?
I have a new design implemented with oring diodes circuit as shown in picture below, where I have POE_VIN_24V coming from POE+ Module, and PHNX_DC_IN coming from phoenix connector, that is connected ...
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TVS Diode current flow at breakdown
This was a question asked to us by our client.The question is
'We have a TVS diode with a break down voltage of 31V.When a pulse of amplitude 31.7V and a duration of 100ms second is applied the diode ...
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How to avoid short circuit on battery wires on a charging circuit
I built a mobile robot which uses 24Vdc 200Ah battery pack to power 2 DC motors.
The circuit used to power the system is pretty robust, I used a relay to switch the motor controllers on and off, and ...
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Help me identify an SMD diode
I have a faulty power supply circuit of a PELCO PTZ camera. It has a burnt diode with the marking CT 6DZRS. I can't find the exact specs or type of the diode. The image is attached
Help will be much ...
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The effect of silicon diode vs Schottky diode as reverse voltage protection of a LED
I have a 24Vac, 50Hz source and RGB LED to be driven from it. As the LED reverse max is like 5V, I have to prevent the reverse half cycle of voltage from being applied across the LED. There are two ...
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Which is better - series or parallel rectifier? [closed]
The idea for this question gave me the question Understanding positive and negative rectifiers. Here I want to summarize the ideas behind the two circuit configurations - series and parallel, hoping ...
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what is the voltage graph of the resistor that found in between two reversed ideal diodes in series?
I find a small problem when I tried to illustrate the voltage graph of this circuit, I used multisim to help me but the result was confusing, sometime the graph is the same of the input voltage and ...
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Understanding positive and negative rectifiers [closed]
How is the first circuit a negative rectifier? My thought is the current flows forward so the diode turned into a short and Vout is postive, and if current is reversed then the diode blocks the flow.
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Why can't I apply the same logic?
it's difficult to understand the exercise, because I can't apply the same logic as the exercise. To solve it I have to find the Total chains one and two. However, when I did exercise a I managed to ...
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Why does it seem like the ideal photodiode model leads to a violation of conservation of energy?
Short version of my question:
Roughly speaking, the output power from a properly biased ideal photodiode feeding a resistor is quadratic with the optical input power, with seemingly no limit. So at ...
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Charging a capacitor through a diode
I am a student who is trying understand some things.
I read in a book that a capacitor can charge up to battery voltage when connecting in series with a resistor and battery like this:
Can it charge ...
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How to select ESD TVS diode? [closed]
This is the following specification of my circuit
Vin 8V to 32V
The breakdown voltage should be 33V of TVS
I don't know what clamping voltage means please simplify it for me
What should be Vc?
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Is the synchronous buck converter suitable for high current applications? [closed]
For I know, the reason why the efficiency of synchronous buck converters is higher than that regular ones is because they use a MOSFET instead of a freewheeling diode, and MOSFETs generally have ...
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How to analyze ideal diode circuit
For the first part of the problem, I have figured out that when Vs = 60 V, Vo is 50 V when D1 is reverse biased and D2 is forward biased.
The question also asks to find Vo when Vs = -60 V. This is ...
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Art of Electronics - Confused about Zener Diode voltage formula
Working through Art of Electronics and the section on Zener diodes confuses me. There's another question about this section on the site (Art of Electronics - Zener Diode Example), but I'm still ...
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Determining the region of operation of these two diodes
I'm having trouble determining the region of operation for these two (ideal) diodes. Do I check the Vopencircuit values or their current values?
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Testing a hockey puck SCR
I have a hockey puck SCR in my circuit which I suspect might be faulty. The reason I suspect the SCR is that while my system is charging up it discharges prematurely and arcs.
I tested it with an ...
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Can anyone identify this surface-mount sensor?
The picture shows a part of a brushless motor. The sensor looks like it may be a Hall-effect sensor, but I'm not sure. Can anyone help me identify it?
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Chip based logic, NOR by sn74hc02n analog [closed]
I think I'm not understand something obvious when trying to implement the complex logic(half-adder) by NORs. Possible to simplify my question, why in this position the diod is emitting:
In this state ...
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Transistor gets too hot, what am I doing wrong?
I am very, very new to circuit design.
I have designed a PWM circuit to control the flow rate of a small diaphragm pump. Prior to making this PCB I have demoed this setup on a solderless breadboard ...
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Step-up like logical "inverse diode" operation [closed]
In the same way that a diode lowers the voltage typically by 0.6V/0.7V, I would like to understand the minimum and simplest circuit to obtain the reverse, i.e. raise the voltage by 0.6V/0.7V compared ...
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Can diodes be tested successfully in situ? [closed]
I have tested a bunch of diodes in situ on a washing machine PCB. One comes back as expected with values of 0.6v and OL depending on testing direction. The rest show the same 0.6v in the expected ...
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