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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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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777 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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692 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
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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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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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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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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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259 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
221 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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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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954 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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368 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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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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154 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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682 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
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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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24 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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637 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
131 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
606 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
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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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2answers
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Mosfet gate driving circuit by microcontroller [closed]

IRF540 will suitable for switching positive supply..? "will It work under 5voltage to gate"?*
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Can MOSFET(BSS138) able to switch 5v 1a (DC) load? [closed]

I have one simple question about the MOSFET. Can N-Channel MOSFET(BSS138) able to switch the (DC) 5V 1A load/line ? (Input to mosfet will be the 3.3V from MCU). Below is the image of connections. ...
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Need help to find out this datasheet or similer model parts that can replace with this?

Need help to find out this datasheet or similar model parts that can i replace with this...??? i have have a problem with this transistor...this transistor front pin broken from body i want to ...
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1answer
177 views

irf840 power mosfet [closed]

can irf840 power mosfet pass ac and also is it possible to logically control it? I have the need to control an ac motor with a microcontroller (msp430). so whenever there is a dc signal from the ...
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45 views

Accumulation layer cause by threshold voltage

Is \$V_T\$ , the voltage that just causes an accumulation layer to form in the conducting channel is larger the closer you are to the source contact in MOSFET?
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324 views

Make an opamp go rail-to-rail on a voltage higher than opamp supply [closed]

So I've chosen to work with an High Frequency Opamp that can only use 5V for power (I can't use any other Opamp). But I need the signals to go Rail-to-rail at say, 24V. So naturally I thought I'd just ...
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1answer
79 views

Cash drawer working , if possible schematic [closed]

Can anyone tell me as to how the cash drawer works? A schematic would be helpful too if anyone can find it! This circuit will work after adjusting the resistance and adding diode for reverse current.
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579 views

I need a simple example of IRF510 mosfet

I am attempting to duplicate the circuit of IRF520 Mosfet Driver module. I am however a bit confused at all the examples ive found online. I want to turn on and off 12v but i have to supply 5 volt ...
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1answer
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turn off MosFet?

video of waveform Hi, A 555 timer at 10 kHz is driving a IR2117 gate driver. IR2117 datasheet here The load is a capacitor in parallel with a light bulb. The IR2117's Vcc is supplied by a bench ...
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136 views

Are these resistors in series?

We had this question as a part of a small signal analysis question on the Final. This circuit I drew below is the DC analysis which is the first step pre-AC analysis which will have a totally ...
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1answer
79 views

How a MOSFET transistor works [deeply]? [closed]

I want to know deeply about how a MOSFET transistor works ! for example , Why electric field makes electron flowing ? , Why do we use metal oxide instead of other materials ? , what is advantages for ...
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1answer
76 views

mosfet circuit without get supply mosfet on, why? [closed]

in ckt i not give gate supply and vd=12v than vs=12v in this condition mosfet not work as switch. why this?
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1answer
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How to determine 10 K resistor on the schematic? [closed]

I have problem determining my 10 K resistor. I need the calculation. Please help me.