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
149 views

Is this circuit damaging my microcontroller?

I have a circuit which is designed to set off one of two e-matches at a given time as controlled by a microcontroller. The circuit itself functions as intended. The potential problem is that after ...
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2answers
60 views

SPDT using transistors to switch between two seperate voltage sources

This is probably a stupid question but I have been searching everywhere and cannot find a solution that works. I am trying to come up with a circuit using transistors that acts as a SPDT switch to ...
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2answers
70 views

Making a “voltage switch”

I'm an electronics newbie. I have a circuit in which I have two input voltages, Vin and Vflag, and one output, Vout. Basically I want the following: If Vflag =0, Vout =0. If Vflag = 1, Vout = Vin. My ...
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3answers
126 views

What is the purpose of MOSFETs in this schematic?

On the main power line there are two MOSFETs but for what reason? The MOSFETs in question are Q1 and Q2.
0
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1answer
70 views

PWM signals averaged or not

I am using analogWrite(PWM) from Arduino UNO to control the gates of 30N06L N-channel mosfets. The values of PWM are programmed such that it controls the current through the loads for my control ...
0
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1answer
40 views

Finding exit resistance of a MOSFET [on hold]

Two MOSFET-s \$M_1,M_2\$ are in saturation. Canal lengths: \$L_1=2L_2\$, Drain currents: \$I_{d1}=I_{d2}\$, \$V_{ds1}=V_{ds2}\$ and \$\Delta L\$ is same for both of these MOSFET-s. So, I don't know ...
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1answer
43 views

N channel MOSFET to drive 9-12V device with micro controller

Would this MOSFET would fine for driving things like a 9-12V DC motor? Datasheet: http://www.jameco.com/Jameco/Products/ProdDS/1560173.pdf
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1answer
63 views

555 and transistors: using a transistor to ground the reset pin of a 555 and how to drive a MOSFET with a 555

Parachute Deployment Timer I am busy trying to build a parachute deployment timer for an amateur rocket using 555 ics What have I done thus far I have a switch that closes temporarily while the ...
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2answers
43 views

For 3.3V microprocessors, what's the best way to power the gate of a MOSFET?

The new processors are all 3.3V and dropping. So while I am used to 5V arduinos being able to power the gate of a MOSFET, at least most of the way, this is not going to be true any more. And for an ...
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votes
4answers
306 views

Is there any reason to use junction or Darlington transistors for power applications?

In quite a few Arduino examples, you see people using junction transistors to power a motor. In this case, for example, he's using a Darlington transistor: ...
0
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0answers
24 views

semiconductor device modeling [closed]

in FDSOI NMOS,the channel is to be made of metallic conductor .since the process of accumulation,depletion and inversion need not nescessarily to take place.whether this will eliminate the threshold ...
0
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1answer
35 views

5a 24v mosfet h bridge to power solenoid

I created a mosfet h bridge based on the design from bristolwatch. I'm using it to power a solenoid (that needs +24v or -24v to open/close a valve). If I connect the solenoid directly up to my ...
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3answers
37 views

RaspberryPi + FET LED lighting controller

I'm attempting to control an LED Lighting Strip from a RasperryPI GPIO pin. I have the following setup: simulate this circuit – Schematic created using CircuitLab This is the diagram ...
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0answers
23 views

Graphing a relation between input and output voltages in a circuit with 2 MOSFETs [duplicate]

simulate this circuit – Schematic created using CircuitLab Sorry for the 'homework' post. \$Vout=f(Vin), 0V < Vin < 3V, Vdd=3V, R=20k \Omega, \beta1=\beta2=10mA/V^2, Vtn=0.5V\$ And ...
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3answers
68 views

Mosfet motor problems with bluetooth module

I'm playing around with a bluetooth module and want to control a motor using the module and a phone. I manage to control a small motor (±30 mA), but as soon as I'm connecting a bigger motor I'm ...
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0answers
79 views

MOSFET circuit: Calculating power in a resistor

This is the problem and the second question. I know by default Power = VI, but I'm not sure which voltage to take (I'm assuming Vds). I know Vgs controls Vds. I assume the Power here is Vds x Id, ...
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0answers
34 views

Graphing a relation between input and output voltage in a circuit with 2 MOSFETs

simulate this circuit – Schematic created using CircuitLab Sorry for the 'homework' post. \$Vout=f(Vin), 0V < Vin < 3V, Vdd=3V, R=20k \Omega, \beta1=\beta2=10mA/V^2, Vtn=0.5V\$ And ...
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3answers
102 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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2answers
61 views

Will this P channel Mosfet switch work from a 3v3 GPIO

I'm designing a circuit that I can reuse over again to switch loads of different kinds from around 8-30v and from around 0.5-15amp. Like a universal Solid state relay but I want my own custom circuit ...
0
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1answer
32 views

Heatsink for diode and mosfet in 12V 15A LC circuit

I am trying to design simple step down bulk voltage converter: This circuit will be 'stepping down' 12V to lower voltages depending on needs (driven by 20kHz PWM with variable duty cycles). The ...
1
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0answers
31 views

driving a Peltier with a MOSFET

I am attempting to drive a Peltier device using a single MOSFET, controlled by a microcontroller. I am working with several different peltiers and various MOSFETs, so wont provide component details ...
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2answers
157 views

Understand mosfet conductance simulation?

I made a simple simulation of following circuit (in LTSpice): The IRFZ44N mosfet (10v on gate voltage) is switched on and off with 1kHZ 12V 50% duty cycle PWM signal. The "Heavy-load" is just a ...
0
votes
1answer
49 views

How to identify semiconductor parameters for spice model?

I am simulating circuit which uses NPN IRFZ44N power MOSFET and MBR1560CT rectifier (used in the circuit just as a shottky diode, connecting 2 out of its 3 legs only). Here is a circuit made in ...
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2answers
30 views

Using a IR2125 to drive a MOSFET gate

I've done a good bit of experimentation and learned quite a bit from other members of the site here. I've built several circuits that drive an N-channel MOSFET on the "low side". But to build an ...
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3answers
221 views

MOSFET to run 12 V, 0.5 A door lock

After searching for a BJT solution, I decided to replace my Darlington pair with a single MOSFET transistor. I have a microcontroller with max I/O pin current of 4 mA at 3.3 V. I have a FQP30N06L ...
3
votes
3answers
369 views

Power MOSFET gets hot while driving Peltier by step-down buck voltage converter

I have a TEC1-12712 Peltier element, which I am driving using Arduino microcontroller through IRFZ44N and buck step down converter (to smooth PWM). Overall, circuit consists of: 12V, 8.5A max DC ...
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2answers
51 views

12v switching ChipFet with a 3V gate? [closed]

The title may seem ridiculous, but I am unable to find a ChipFet that has a 3V gate, and can switch 12V, I am unable to provide 5V to the gate. Are there any well known SMD small and compact Mosfets ...
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0answers
36 views

Isolate LiPo While Charging

I'm working on a very small board design that will run from a 25 mAh LiPo battery. Given the board size constraints, I'd like to move the charging circuit off to another board and just have a JST ...
0
votes
1answer
30 views

what should be the aspect ratio for 32nm and 45nm technology?

i am designing a combinational circuit and circuit worked well too. but i want to know if i directly write a net list rather than generating it through some schematic what should be the concept behind ...
0
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2answers
76 views

How to control physical buttons [closed]

I want to replace physical keyboard with raspberry touchscreen. Is there any IC that can make contact between any PIN, like keyboard does? Keyboard is connect to GAL22V10, but I don't wanna mess with ...
0
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2answers
144 views

How can I protect my MOSFET?

I'm using this depletion-mode MOSFET in a high-voltage power-management circuit. My 500V DC supply isn't high grade, and now that I've blown two of these MOSFETs (gate shorts to drain) I'm wondering ...
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0answers
69 views

Mosfet rail to rail discrete level converter gate drive

I've been trying to work out how to implement a fairly simple gate driver from discrete mosfets, probably similar to a basic comparator with push pull outputs. The purpose is to drive the gate of a ...
0
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1answer
47 views

Inductor waveform not increasing when supply is increased

I am building and testing the transmitter side of a wireless charger. The image below is a rough representation of what I am doing, U1 is powered by an IR2110 driver at 5kHz off a 555. V1 is 30VDC ...
0
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1answer
35 views

CMOS on breadboard - Which P & N type MOSFETs to get started?

I would like to implement my own CMOS logic on a breadboard. I have already designed a simple PCB with basic logical functionality but now I'm stuck on the choice of N & P Type transistors ...
0
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1answer
25 views

Intermittent Power Selection with Mosfets

I'm designing a few boards that go in series with with each other. simulate this circuit – Schematic created using CircuitLab The PCB layout is the same for all, so PCBs with unpopulated ...
0
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1answer
25 views

Creating Cadence Virtuoso Layout in Rectangular MOS Power device [closed]

I am trying to create a Power MOSFET with W/L = 9.2mm/1.6u This value is as per the design specification obtained by simulation using schematic value. I am new to Cadence Virtuoso and would ...
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2answers
34 views

how to see dc operating region names in cadence DC annotation for MOSFET

How do I see the operating region names like "active, saturation" in cadence for MOSFET. I remember getting it by setting up View> DC annotation> Setup > selecting DC operating region > Display > ...
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0answers
65 views

Continued Problem of the hot MOSFET in a SEPIC converter

This question is based on the one that I previously posted in: MOSFET gets unusually hot in a SEPIC converter Since that time, I have made a lot of changes to my circuit based on the feedback given ...
12
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3answers
279 views

How many MOSFETs can we safely parallel in condition of very high currents? I had problems with a motor application at 48V 1600A

I tried with some configurations in which 16+16 MOSfets of 240A each (really they are case limited to 80-90A because of source terminal, but i doubled this termminal with a very thick copper wire for ...
0
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3answers
38 views

Using 3N128 mosfets as 12V controller with microcontroller

I recently found a bag of 3N128's at a yard sale, coincidentally, a couple days after I saw this video on YouTube about controlling a 12V motor with a mosfet, car battery, and arduino: ...
0
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1answer
52 views

How to do DC Analysis for a Common Source Biasing Circuit using NMOS

I am having a lot of trouble with this specific problem. I want to find Vg, Vd, Vs, and Id for this specific common source biasing circuit that has an NMOS. I have these values given: Vdd = 9V, k/2 = ...
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0answers
65 views

How to drive a MOSFET from AC wih max efficiency?

Short version: if I needed to drive a MOSFET from mains AC, that will be switching (PWMing) mains AC as well, and needed to do this "fast and often"* how should I derive the power to drive it's gate ...
0
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1answer
78 views

Switching between two power supplies with a P channel Mosfet, Is VGS or VDS a problem?

So I am using the following circuit to switch between VIN 0-30v and USBVIN 5v. I thought I found the ideal solution until I realised the FET in the schematic only has a max VGS of 8V. But I don't ...
1
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1answer
40 views

MC34063 P-MOSFET driver?

I've got a successful buck converter design using an LM3485. It's got a MOSFET gate driver output pin that swings between Vin and Vin-5V - perfect. My MOSFET is a SQ1431EH-T1-GE3. It has a maximum Vgs ...
6
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1answer
83 views

A naive solar panel maximum power point control circuit

I am fooling around with a solar panel, just to try stuff and learn in the process (not trying to produce something I would actually use). Its placement is very far from optimal - vertically behind ...
0
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3answers
82 views

Mosfet Power Dissipation

I'm trying to find power dissipation of my mosfet when I pull 17.5A. I'm using CSD18542ktt. Can anyone help me what equations can i use. I have calculated the max power using the following equation. ...
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0answers
81 views

Replace BJTs with MOSFETs

Is there anyway to replace this Darlington BJT amplifier pair in this signal detector with MOSFETs instead? Perhaps using MOSFETs to amplify the current instead. I am trying to replace this Darlington ...
0
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2answers
75 views

2N7000 behaviour explanation

I recently bought a 2N7000 transistor and though it was a cheaper replacement MOSFET compared to the STP55NE06 as I didn't need to handle high voltages and high currents. However it acted very ...
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0answers
37 views

Series Gate Resistor needed at low Capacitance?

even though this question has been answered before for various scenarios, I would like to ask for a generic advice. So I want to drive a certain resistive load from a microcontroller pin. Let MCU be ...
0
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2answers
69 views

Logic level MOSFET switch

I am trying to use a FET to switch on a boost converter. simulate this circuit – Schematic created using CircuitLab From reading I have found that people like to use IRFML8244TRPBF for ...