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Boost converter Issue
My aim is to boost a 3v DC input voltage to an output DC voltage of around 12 to 15v. Based on the schematic I have designed this should work theoretically with the components I have chosen. Right now...
View ArticleMOSFET shorted after I connect them in parallel, what's wrong?
One of my MOSFET source-drain shorted after I connect them in parallel? So I was making an ARC speaker yesterday, and I used one MOSFET ( irf540), and it got really hot, but it did not blow up, so I...
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Pump does not get enough current via MOSFET
I am trying to build the v4.3 circuit described here: Will this schematic work? I am building just one branch out of the decoder IC to test on a breadboard. Component info is as follows: The...
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PWM voltage boost for mosfet
I need to run 12v motor with using Raspberry Pi. I made a circuit which works but then I noticed a “little” problem. Pi’s software PWM signal is only 3 volts so BUZ11 doesn’t open enough. I found this...
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MOSFET Driver Stress
I am using an Allegro Microsystems A4935 3-phase MOSFET driver in a brushless speed controller. I recently got the motor spinning, but when I began increasing the voltage, my commutation started to...
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Bias common source with current source load
How would you choose Vb and bias voltage for M1 to make M1 and M2 operate in saturation mode for the configuration below: M1 saturation: Vout – Vb < Vt1 M2 saturation: Vin – Vout < Vt2 How to...
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N03L Mosfets for LED strip driver
I’m salvaging parts from old computers, read the datasheet of those parts and try to understand the important things build stuff. While i now understand some crucial things about mosfets there is alot...
View ArticleMOS is on with no current
Here is a sentence from Design of Analog CMOS Integrated Circuit that I don’t quite understand: “Note that in contrast to bipolar transistors, a MOS device may be even on if it carries no current.”...
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MOSFET Driver Failure
I’m having trouble with TC4421A MOSFET drivers in a new PWM DC Heater design blowing. The 12V power supply used during testing is capable of 25A. While doing my initial testing, I started off with...
View ArticleDoes area of MOSFETS needs to increase if one wishes to increase maximum...
Suppose one wishes to increase maximum drain current of a MOSFET. What factors need to change, and will the area of the MOSFET necessarily increase by this decision?
View ArticleCommon Gate For Power Mosfet
The common base configuration has been well documented for the BJT .Small signal analysis shows better high frequency capability then common emmitter for the same transistor.I have seen common gate...
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Simulated MOSFET circuit – Does not work as expected
I have designed this circuit to turn off the mosfet as soon as I apply 1.2A of current for 2ms. Also I want to know the status through the LED whether the mosfet is turned off or not.When I simulated...
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MOSFET Without Gate Resistor is Failing
I have two MOSFET circuits; one is working and the other fails and I’m not sure why. I just want to turn on/off the LED, nothing special, no fast switching. Below is the working circuit (series gate...
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Subwoofer LEDS – RGB, brightness controlled by amp
I’m trying to build a subwoofer with integrated LEDs which will pulse to the beat. I’ve seen a few projects for this around the net, but everybody seems to be ‘winging it’ and not necessarily creating...
View ArticleFast switching (microsecond to nanosecond) voltage using 10V signal pulse
I have an application where i need to be able to switch from a 20V supply to a 40-50V (variable) supply in a very small amount of time. Ideally this changeover needs to be prompted with a signal pulse...
View Articledischarge power rail with MOSFET
I need to discharge a power rail from 3.8V to 0V within 200ms. The control signal is active low (i.e. start discharging when control becomes low). I think the easiest implementation probably is to use...
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What does the channel voltage in a MOSFET really mean and how does it lead to...
Many books (Chenming-Hu Ch.6 Page 15, Neamen Page 413) use the term ‘channel voltage’ $V(y)$ to mean ‘the potential in the inverted channel at a point $y$ distance away from the source along the...
View ArticleHelp Identify N-MOSFET labeled “540N 3811g” for monitor repair [duplicate]
This question already has an answer here: Identify/substitute an SMD MOSFET labeled “540N 88KFG” for LCD monitor repair 1 answer Identify N-MOSFET labeled “540N 3811g” for monitor repair [closed]
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Common Source Amplifier with Active Load
There’s a few things that I don’t understand with these questions. First, thing I don’t understand is why they are connecting Vdd to the source terminals on Q2 and Q3. I understand what all values...
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Storing the the charge from a MOSFET Bridge Rectifier
I am using the following MOSFET Bridge to harvest AC bursts that coming off from a electromagnetic transducer. Infront of this circuit is a Super capasitor I have placed. I read the following on a...
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