Questions tagged [mosfet]

An transconductance (using voltage to control current) electronic component used for switching and amplification. Acronym for Metal-Oxide-Semiconductor Field-Effect Transistor. (from http://en.wikipedia.org/wiki/Transistor)

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1answer
109 views

Analyzing MOSFET circuit

Here is the problem: And here is my solution and I want to check if it is correct or not: ...
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1answer
110 views

MOSFET explanation

Hi i bought some MOSFETs IRFP2907 to be specific and i get some weird behavior from them. I have been testing them by connecting the drain to the positive side of a 9V battery and the source via a led ...
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80 views

Uprating for the MOSFET

How good is it to uprate FET device to exceed the 150C junction limit absolute? What are the critical parameters to look for when uprating FET device?
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337 views

Where can i get latest electronic seminar topics? [closed]

Hi i would like to know a website that discusses the latest technology in the field of electronics (mosfet, microcontroller etc). I have to give a technical seminar on electronics and communication ...
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1answer
110 views

Does IRF3710 have a schottky diode inside?

I'm using IRF3710 MOSFET H-bridge for 40A 12V motor driver. Should I use a schottky diode inside or should I use a separate one?
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1answer
77 views

Setting up a cascode amplifier in a schematic

I had been thinking this for hours. If anyone here could point me if I'm doing the schematic correcly I'd appreciate it. Here's the problem: Consider a cascode amplifier consisting of two stacked ...
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3answers
105 views

Qustion about subthreshold voltage and driving capability

Recently,i read some paper,and some of paper said : To reduce the power consumption of VLSI,Supply voltage has decreased to the subthreshold voltage,and the subthreshold circuits consume a very low ...
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1answer
407 views

Why use a mosfet instead of potentiometer? [closed]

A mosfet is being used to increase and decrease the current across an ir led and resistor (in series) circuit. The voltage across the circuit is changed to increase or decrease current flowing through ...
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3answers
574 views

Hot Mosfet IRL540N with Gate 5v and Source 12v-260 mA [closed]

I've connected the + of a 12v powersupply to a 12v LED-spot. The - of the LED-spot is connected to the source of a IRL540N mosfet. The drain is connect to the - of the 12v power supply and the ground ...
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940 views

Does connecting the gate of MOSFET to ground work? [closed]

In a MOSFET, what happens if we connect the gate terminal to ground? Does connecting gate to ground work?
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1answer
136 views

How to modify this circuit that controls servos with audio jack to control switches [closed]

A circuit is given at http://makezine.com/projects/make-34/smartphone-servo/ that controls two independent servos from a three pin audio jack. How do I modify the circuit so it can control two ...
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1answer
580 views

What is Minority Carrier Storage Time?

I know that Minority Carrier Life-Time is the time difference Between generation of minority carrier & their Recombination. I am bit Confused Between Minority Carrier Storage Time & Minority ...
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1answer
2k views

What is an acceptable temperature rise for a Mosfet?

I will be using driving N-channel Mosfets with 5v PWM to switch 24v 2A(per channel) LED strips. I will use four per strip (RGBW) and have 6 strips, totalling 24 Mosfets on the PCB. I am looking at ...
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what is conduction loss in a transistor(BJT)? how is transistor's conduction loss lesser than that in a mosfet? [closed]

why does a MOSFET have higher conduction loss compared to a transistor? While designing switching circuits , driver circuits controlled by a microcontroller, how should i select a switching device(i.e;...
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1answer
1k views

what is this error in PSPICE with IR2113 [closed]

I want drive a buck converter with bootstrap technique. but this circuit does not work!
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62 views

DS open failure mode for trench MOSFET

After switching on and off few times for a trench MOSFET in a motor application, D-S shows open. After decap to check the bonding, the bonding wires are all good. What might cause this kind of failure?...
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315 views

Need a P channel depletion MOSFET with continuous current of 2400mA [closed]

Can you guys recommend me some PFETs for Q2 in this circuit 1 (figure 2) that I can use to get continuous current flow of 2400mA? My segment current is 300mA, so I'm looking at 300mA X 8 = 2400mA for ...
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703 views

Gain of a differential amplifier in PSpice

I am modelling a differential amplifier in PSPice using MOSFET. Here is the schematic: In this i want to track the gain of the circuit by changing the value of the width of NMOS. Now can anybody ...
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2answers
667 views

Solenoid Driver Circuit

I want to drive a solenoid (12V load and 20A rating) using a MOSFET and an Arduino. What kind of switching circuit should I use?
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1answer
652 views

overdrive voltage margin to enter MOS into subthreshold and saturation region

What is the equation for Vgs value for any MOSFET in such a way that, Below Vgs, Mos is in subthreshold region, Above Vgs, Mos is in saturation region?
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2answers
279 views

Why does one LED slightly influence the other parallel LED although controled by differenct MOSFET-N?

I created a simple circuit that turns on and off two 12VDC LED with signals from my Arduino Leonardo R3, which is powered by a 5V USB cable from my PC. The LEDs are attached to a dedicated 12V power ...
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1answer
273 views

Where to place a diode - DC 12v motor controller [duplicate]

I'm building a controller for a DC motor. I'm using a 12V DC motor from windscreen wipers. Here is my circuit diagram and a video of the simulation I made. https://www.youtube.com/watch?v=...
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1answer
57 views

Logic-level MOSFET not varying drain voltage [closed]

I have a series of FQP30N06L logic-level MOSFETs connected to a 3.3V logic controller. I am feeding the MOSFETs a PWM signal in order to vary the drain voltage, however, I am only experiencing a ...
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1answer
722 views

MOSFET replacement / equivalent

I'm looking for a replacement or an equivalent MOSFET to replace 6R190C6. Seems to be a 600 V MOSFET and only available in large quantities.
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1answer
562 views

Charge LiFePO4 Cell using Arduino and a MOSFET

I want to charge my LiFePO4 cell with the following schematic. simulate this circuit – Schematic created using CircuitLab The arduino provides a PWM signal, which goes to an isolated MOSFET ...
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1answer
1k views

N-MOSFET and high frequencies [closed]

I am using this Mosfet (http://www.vishay.com/docs/91017/91017.pdf) as a switch. Vd is a sinusoid, amplitude = 2V Vgs is either 0V or 5V. In low frequencies (less than 1 MHz), everything is fine: -if ...
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2answers
847 views

Low Vgs MOSFET as switch

I'm trying to figure out how I can switch this device on. I tried p-mosfet but it has too high Vgs and the difference between gate and source is really low. Is there any other way?
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Slayer Exciter Circuit [duplicate]

R1 = 2Ω R2 >= 22kΩ D2 = 1N4148, or 1N400x (x is a number) U1 = MIC4452 (MIC4452YN is the through-hole version) Q1 = 2SK2542 So basically I want to run the circuit from a NE555 timer because I don't ...
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1answer
709 views

What is the most commonly used transistor?

Just a question about transistors from a rookie. I was wondering what kind of transistor is most commonly used? Bipolar transistors? JFET? MOSFET?
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4answers
3k views

Switch from 3.3V to 24V Raspberry Pi

I want to convert the Raspberry Pi's 3.3V output to 24V as this is what the I/O uses on the Universal Robot arm, UR5. The 24V is supplied by the UR5 and so I thought that a simple NPN transistor would ...
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2answers
86 views

Calculate resistance for high amperage LEDs for control with Arduino

I'm trying to control my LED strip with my Arduino, so I decided to buy a FET. Now I want to learn why and what kind of resistance should be put between the gate and the Arduino. I have a long (1560 ...
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2answers
362 views

How do we explain the common-mode feedback in an intuitive way?

There are such beautiful circuit ideas that make you hold your breath and admire them silently. Such an idea is the common-mode feedback (CMFB) in fully differential amplifiers. I was not familiar ...
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3k views

How to create a circuit to turn off LED when switch is “ON” and turn on when “OFF”

how to create a circuit to TURN OFF LED WHEN SWITCH IS "ON" AND TURN OFF LED WHEN SWITCH IF "OFF" for 12v input? simulate this circuit – Schematic created using CircuitLab Figure 2. Basic ...
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1answer
1k views

Why are FETs preferred over BJTs? [duplicate]

Why are FETs preffered over BJTs nowadays? Does this have to do with higher switching speed. Also, if someone says that they are preferred due to low cost, please tell the industrial rate comparison ...
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269 views

RGB control with MOSFets

I would like to control RGB leds , or other PWN channels , using a micro controlelr, and ...
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2answers
229 views

I'm having issues getting a basic MOSFET switch to work [closed]

I read this: Using MOSFET as switch And this: http://bildr.org/2012/03/rfp30n06le-arduino/ This is my wiring(G, D, S are Gate Drain and Source): It's not working. The MOSFET is of the correct ...
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1answer
106 views

What type of MOSFET is this

Hey so I was able to conduct a wireless powered experiment, using a power MOSFET. The range of the electromegnetic field was amazing. Truly beautiful. Anyway so I found this MOSFET and I was like ...
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1answer
967 views

Electronics Books [duplicate]

I am earching for a good book for electronic devices and circuits. Details about 'dc' as well as 'ac' biasing are what I am interested in. If you could guide me to a good book, it would be wonderful. ...
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1answer
374 views

Fet array operation [closed]

Can anyone explain to me the operation of the following FET arrray . http://www.diodes.com/datasheets/DMN2019UTS.pdf
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1answer
60 views

What is the scope of semiconductor device fabrication compared to other fields? [closed]

I am planning on applying to colleges for pursuing an MS degree. I would like to know the scope of semiconductor device modelling, both in terms of jobs as well as research. I also wish to know about ...
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1answer
159 views

Trying to debug a PWM motor drive with cascode configuration - is the MOSFET busted?

I made a simple DC/universal motor drive as per the circuit in the picture. I was experimenting with it by powering it from a variable transformer. Note that both Vdd (300V) and the 12V Vb1 (for ...
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1answer
734 views

Help with this MOSFET comparator

So I'm building something and I figured I needed a mid-voltage Comparator or symmetrical Schmitt Trigger (by losing the MOSFET half of the V2 side). For reasons of "just-because", I decided it should ...
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2answers
219 views

SPI control STP16CP05 [closed]

I have this LED driver STP16CP05 https://www.st.com/resource/en/datasheet/stp16cp05.pdf I would want to PWM control 16 mosfets with the 16 outputs of the driver, is that possible or do I need a ...
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1answer
25 views

Danfoss ac drive output voltage unbalance

i have a problem with danfoss ac drive, i replace the output igbt module with new one, when power the drive the output voltage not balance and the input voltage balance L1: 400v,L2:400v,L3:400v, ...
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1answer
692 views

Need help in understanding miller plateau region [duplicate]

Will somebody please help me to understand what is role of millet plateau region in switching of MOSFETs?
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1answer
135 views

practical Mosfet circuit Y/N? [closed]

Hi im trying to activate non-logic Mosfet using Arduino as in img. is that ok or the mosfet will still on?
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1answer
633 views

Help Identify N-MOSFET labeled “540N 3811g” for monitor repair [duplicate]

Could somebody please help me identify this n-mosfet? the pcb belongs to a qnix QX2710. I didn't found any datasheet\or specific information about it. *i created another thead with a correctly ...
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3answers
3k views

Why is BJT called as current controlled current source and FET as voltage controlled? [duplicate]

If BJT amplifies only current then why CB configuration has voltage gain but no current gain?
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1answer
55 views

Does LTSpice even have a time delay for its MOSFETs?

When I use LTSpice to create a MOSFET, it comes with a very high resistance when closed and a very low resistance when open. My guess is that the creators of LTSpice just took two values that are some ...
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2answers
342 views

Mosfet gate driving circuit by microcontroller [closed]

IRF540 will suitable for switching positive supply..? "will It work under 5voltage to gate"?*