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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56 views

MOSFET to disconnect 3S 12.6V battery

I have a device absorbing up to 12 amps that is powered by a 3S 12.6V lipo battery. Every time I have to start this device, I need to plug-in the battery and this is quite annoying. I would like to ...
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43 views

PWM Mosfet (and help identifying the right one)

I am building a project to control a 12 V, 10 A heating system from a Raspberry Pi. I have identified that I need to use a MOSFET transistor and I will control the output by using pulse width ...
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51 views

What is the reasoning behind Barkhausen's criteria?

Especially why should loop gain be equal to 1, won't that give us infinite circuit gain?
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14 views

Arduino RGBW 24v LED strip driver

This might not even be the right place for me to ask, but I hope somebody can help; I have an arduino mega with 4 PWM outputs (5v, fitted with 220 ohm resistor) that I would like to use to control ...
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31 views

In a 3 phase 5 level inverter how is the gate pulse for each mosfet/igbt designed [on hold]

How is pulse generated for each thyristor
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88 views

What are these resistors for?

I am looking at implementing a MOSFET Bridge Rectifier circuit. I am trying understand why there is a difference in the basic application circuit and layout from the app note. The layout image below ...
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56 views

exceed drain-source voltage on mosfet

what happens if I exceed the maximum rating of the drain-to-source voltage of an N-MOSFET I am using NTNS3C94NZ so 12 V in this case datasheet: https://www.onsemi.com/pub/Collateral/NTNS3C94NZ-D....
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24 views

Error in LTSPICE MOSFET model

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43 views

How to start designing a multistage amplifier? [on hold]

My professor will make us do a project and it's to build a multistage amplifier with these specifications: Design a three-stage amplifier with Bipolar and CMOS transistors to satisfy the ...
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52 views

Switching power source using P-channel MOSFET

In a below schematic, PVBUS and VBUSIN are both attached to USB VBUS of two different USB ports (so +5V). The goal is to be able to power +3V3 regardless of whether VBUSIN is present or not. If VBUSIN ...
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37 views

How to choose the correct N channel Enhancement MOSFETs?

Having little to no experience on MOSFETS i am having trouble part sourcing the correct one, one that will work for my applications. But before i go with the terms let me show the circuit first ...
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55 views

Driving a motor freezes Arduino

I am trying to drive a Carrera Digital car (brushless DC motor) using an Arduino and an L293D h-bridge motor driver. My schematic is the following: I have also connected an IMU (GY-521 MPU-6050) to ...
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35 views

Connecting battery packs in parallel and series, each with their own BMS

Recently I bought cheap a lot of CASIO DT-9723LI battery packs. Every pack consists of 2 Sony 6th-gen Li-ion 18650 cells and its own 2s BMS. Here the question arises: Can I connect this packs ...
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41 views

Is Vout in this circuit loop-grounded when Vin becomes 0V?

I don't have expertise in this area. So any answer or instruction would be helpful to relieve my pain. I think Vout would lose its GND when Vin becomes '0V' because C is located before GND. Am I ...
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26 views

Switch AtTiny1614 on and off

I have built the following circuit to reset an AtTiny1614 (the mega tiny 1 series). They don't have a reset switch and I thought with this circuit I could (hard-)reset the chip by doing a power cycle. ...
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19 views

ZXM61N03FTA as a replacement for Si1308EDL

I'm working on a e-Paper display driver. The reference design uses Si1308EDL as part of the boost converter. I'm sourcing the components from LCSC, but unfortunately Si1308EDL is not in their stock. I ...
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How to suppress noise in my circuit

I illustrated what my circuit do as you see. Switching frequency is 800 Hz. When I increase the load, a noise is heard from my circuit. Here is my drain oscillocope view in frequency domain. What can ...
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44 views

Dual MOSFET Switch Circuit not switching

I'm trying to switch a high-current, 12V load (large parallel LED strip, with the anode connected to LOAD-) using a PWM chip. My approach right now is to use a ...
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43 views

IGBT chip metalization

Consider an IGBT chip within a power module. The top surface of the chip is often metalized by aluminum (with approximately 5 microns thickness) to bond some aluminum wires into the chip; I am hazy ...
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94 views

Circuit for choosing one power supply from several of them

I have a load and four different voltage sources. I want to change the voltage on the load by using four different enable signal as seen in the schematic below. Note that, all of the "Enable" signals ...
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27 views

Designing an over discharge lithium ion protection circuit

I am trying to build a portable RGB LED display that runs off a Lithium Ion battery. After a few days of research, I understand the importance of using a dedicated IC to handle charging the battery, ...
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28 views

Are there MOS VLSI Process Design Kits (SPICE models) for free SPICE simulators?

I want to do some proof-of-concept work in IC analogue IC design. I know that plenty of free circuit simulators exist (LTSpce, NgSpice etc.), however they are meant for PCB simulation and most perform ...
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37 views

Logical level conversion with MOSFET-N

I doubt if the way I am converting the logical level is correct and if it is the best way to do this. The PWM_1 signal comes from a STM32F4 microcontroller. When PWM_1 = logic level 1 I have 3.3V. ...
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42 views

Turn-on and turn-off switching energy

Is it possible to calculate the turn-on and turn-off energy of SiC-MOSFETs with datasheet parameters? The method with ½ * U * I * tr (or tf) cannot be used here. Let us take the C2M0080120D from Cree ...
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52 views

Noisy MOSFET RGB LED driver problem

I'm controlling a 12v RGB LED strip from an Arduino Mega following the tutorial here I'm controlling with 3 pots via the Mega's ADC >> PWM value written out using ...
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33 views

Making a more efficient replacement for my diode

I am making a boost converter using the LM3481 IC (although it might be considered a sepic topology as well). Typically in a boost topology, you put a diode before the output capacitors so they don't ...
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53 views

Pulse Transformer design problem: cant understand for sure whats the reason or irregular output waveform?

A ferrite core pulse transformer provided with 12V PWM signal (as primary winding input voltage) as shown in Fig-1, produces irregular output voltage across the secondary winding as shown in Fig-2. I ...
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249 views

Please review this electric guitar buffer / volume / tone circuit

I have been tinkering with creating a MOSFET buffer circuit for my guitar to boost the high impedance output from the pickups to help drive the signal through long cables and pedal boards. This also ...
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53 views

Would this shift register schematic avoid master/slave if I extended it to four billion bits? [duplicate]

simulate this circuit – Schematic created using CircuitLab The basic data structure for the machine I want to build is a shift register. Quite some time back someone told me that if I could ...
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680 views

Are MOSFET drains ESD sensitive?

There's a lot of post on here about MOSFETs and ESD sensitivity. But whenever the general question is asked, people always go straight to the gate and how sensitive it is. I've developed an LED ...
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22 views

Parasitic Inductance - DPT circuit

I have a question about parasitic inductances. Let's take the figure below as an example, a DPT circuit is shown here. I have added an inductor (parasitic loop inductance). I would like to have a ...
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32 views

How do I solve the input resistance of this BJT and MOSFET in series?

This is a sedra-smith microelectronics excercise question for which I can not find the answer and I hoped for perhaps a solution here?
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33 views

How to get the gain for this MOSFET amplifier?

This is a common drain MOSFET amplifier: simulate this circuit – Schematic created using CircuitLab This is its small signal model at low frequency: simulate this circuit I am at a loss as ...
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47 views

What does worst-case gate capacitance mean in a MOS transistor?

I have searched the statement; MOS worst-case gate capacitance in various forms but no avail. Keep in mind I'm a student. The course I am taking has no reference material. With note slides with ...
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54 views

MOSFET, the effect of the gate voltage

Here the gate voltage is 5V and lots of the 12V input voltage stays across drain and source. Here the gate voltage is 12V and still some voltage stays across drain and source but this time smaller. ...
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3answers
85 views

Driving two MOSFETs with one AND Gate?

I am designing a circuit to drive the brakes on a DC motor. The brakes are a 19.9Ω coil that is disabled when energized (think wheelchair motor style brakes). The brakes work on 24VDC. I have found ...
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103 views

Is there Mosfets for wires? [closed]

Mosfets are pretty cool but they are either designed for circuit boards or for breadboard's. Is there a version of a mosfet that can be used for slightly thicker wires than what would be usually ...
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112 views

What is wrong with this circuit simulated in Proteus?

When simulating this circuit in Proteus, I expect the LED to light up when the switch is closed, but it does not light up. What am I doing wrong?
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45 views

Trouble controlling LED strips with n-mosfets on 2 power supplies

I have 2 equal power supplies and I try to control LED strips using arduino and n-channel mosfets. I've split the strips between the supplies, strip A + arduino is on one power supply, strip B is on ...
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48 views

Send an AC signal from a DC device [closed]

I was able to read a 18VAC signal from the old-school door bell with a voltage divider to my 3.3VDC ESP controller. Nice. Now, I wish to send a 18VAC signal (for 3 seconds) to open the door with that ...
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26 views

Spark plug trigger with time delay

I'm currently working on a personal project where, a part of it, is having a spark plug discharge with a time delay after a signal is sent. Below is the schematic I've come up with so far but I'm not ...
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85 views

Series diode instead of a flyback one

My question is can I use a diode in series with a MOSFET, instead of pusing it as a flyback diode. simulate this circuit – Schematic created using CircuitLab
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52 views

FET-based H-Bridge for bi-color LED

I've got a bi-color LED in a push-button that is red when powered in one direction and green in the other direction. I would like to control it from a Raspberry Pi GPIO pin, e.g. High=Red, Low=Green. ...
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41 views

Parking Light And Signal light with same LED using MOSFETS

I have a project where I have an existing 12v parking light and I want to also have the turn signal use the same light. I've constructed a circuit using 2x NMOS and 1x PMOS. I think it will work and ...
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68 views

IR Light Detector as MOSFET Gate

I would like to use an IR transmitter/receiver pair to detect when an object obstructs (or does not obstruct) the path between the the transmitter and receiver and illuminate an LED when the path is ...
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50 views

high current passing through mosfet is damaging the nrf52

simulate this circuit – Schematic created using CircuitLab recently trying to make a led strip that can be controlled over bluetooth. I need high currents up to 10A. for the test purposes I ...
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1answer
37 views

MOSFET simulation model

I am trying to model a synchronous buck converter, for which I need to choose mosfet models for simulations. I am seeing that it has various parameters out of which length and width is affecting the ...
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69 views

Where is the voltage drop? / How can I test circuit this without using an actual battery?

I've put together the following circuit, it's just a rechargable LED torch, just to try load sharing: simulate this circuit – Schematic created using CircuitLab BAT1 is a LiPo battery, 5.2 V ...
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SiC MOSFET SPICE model not behaving properly

I have been trying to simulate a fully controlled full bridge using SiC MOSFETs and so far haven't gettng at least expected results. So I tried to check what is happening using a single MOSFET and a ...
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1answer
39 views

Requirements for low voltage, low current MOSFET used in current source

I'm trying to determine the minimum requirements for a MOSFET that will be used in a op-amp based current source. I've hit Google and this site and looked at multiple pages, but almost always, they ...