mosfet

I was reading this discussion - Interlock Discussion, because I want to design a Half Bridge MOSFET driver, with interlock. I recreated both the circuits in LTspice that were recommended The logic I want is - In1 In2 Op 0 0 both OFF 1 0 Up MOS ON, BOT MOS OFF 0...

Yesterday I damaged a MOSFET I'm using in a simple control circuit, but it failed in a strange way and I'm trying to figure out what might have caused the failure and how I might prevent it in the future. The MOSFET is controlling a 5v sensor by switching the low side of the power for the...

I'm a beginner and am designing a battery-powered device. - When the power supply is connected, charge the battery while supplying power to the load (red line in the photo). - When the power supply is disconnected, supply power from the battery to the load (blue line in the photo). I'd like to...

I started to read "Design of Analog CMOS Integrated Circuits", Second Edition, by Behzad Razavi and found this circuit in chapter 2 ("Basic MOS Device Physics") question 2.10a, page 40: I had a question regarding its transient response. It's described in detail here

I've been reading Ravazi's book Design Of Analog CMOS Integrated Circuits. regarding the end of chapter 3 (Single-Stage Amplifiers), the book presents the folded cascode (Page 90) I had a question, regarding how to determine the state of transistors in large signal analysis. I wrote it in...

Trying to switch P channel MOSFET IRF9540PBF-BE3 direct from NE555 Power supply is 12v DC Tried all? sample circuits from Google, but I just cannot get it to switch on or off The U15 LED is oscillating away, with 11V and no effect on U21 . But as soon as I connect the NE555 output signal to...

I'm building a TDR pulse generator using a single GaN FET (TP65H300G4LSGB) in high-side configuration, driven by NCP51820. The drain is at 40 V, and the source goes through a 50 Ω resistor to GND. Output is taken from the FET source. My Final target is upto 200v. Pulse specs: ~40 V amplitude...

I have a surge tester setup that uses a high-voltage power supply (up to 1000 V) to charge a non-polarized capacitor bank using SW1 to energize Relay 1 in Image 1. The bank discharges into a waveshape network (inductors + resistors) through a high-power relay, triggered by a push-button. Each...

When S1 is closed, it connects to the main 3V supply. However, when this happens, the piezo element starts buzzing loudly—even though the MOSFET gate remains closed. Why is this happening? Interestingly, when a 1k resistor is placed in series with the inductor (not the 32Ω resistor in the...

I am developing a project where I use two 18650 batteries in series as a buffer in case the primary energy source (electricity from the home network) is missing. I want to integrate an NTC sensor to monitor the temperature of the batteries, so as to isolate the batteries in case their...

Hello everyone, This is my first post here, so I apologize in advance for any mistakes. I'm currently working on a project where an ATtiny13 is the central controller of my circuit. The analog input PB2 is connected to the wiper of a 10kΩ potentiometer, which acts as a sensor. The ATtiny13...

Hello everyone, i have a roidmi eve plus with non spinning LDS(The sensor on top). The board you see is on the sensor assembly. I measure 5v coming to the board, and 2,3v on the pwm pin. The mosfet on the top left corner measures 2,3v on the gate and when i turn the vacuum on i have continuity...

Hello everyone, I have designed a contactor driver circuit that operates in two modes: It initially provides an inrush current (limited) to the contactor coil to engage it. Immediately after engagement, it supplies a constant holding current of approximately 50mA. This topology worked well for...

I'm trying to make a high side driver circuit for my mosfet but am unable to get any output from the driver A possible error might be that the model is not working but I do not know how to test weather the model is imported correctly in ltspice. I I am also making a breadboard circuit of the...

Hi everyone, I’m working on a relatively simple system, but I’m encountering an instability issue in some of my prototypes. I would appreciate any insights you might have! **System Overview** - Power is supplied by a 24V 20Ah battery with a max discharge current of 9.8A. - The 24V line...

Hey there! I'm struggling to find commercial transistors that could be used in cryo(liquid argon, about 88K). I want to do a HBT, CMOS hybrid charge amplifier and I'm struggling to find the right components, especially with the MOSFETs. According to our brother chatgpt most commercial discrete...

Hello! I have been given the opportunity to try designing a board for a 5VDC indicator/annunciator panel. There are several control panels around a building with an on/off status contact each. When closed, a 24VDC signal is sent to this annunciator panel for that particular control panel. The...

Hi, I am an electronics noob. I have some questions regarding a particular application. I have to move a small cylindrical rod using a solenoid (whose capacity is 1.5kg lifting force and rated at 12V). My application requires me to energize the solenoid only when I get a signal from somewhere...

I am designing a simple, cheap, yet intended to be usably accurate free open source mosfet tester with some special features. it will be based on cheap common arduino compatible microcontrollers, where the intend is that it can easily be ported to many boards. as well as that support for many...

I made my DAB Converter in LTspice and it seems to work whenever the NMOS are replaced with switches but I have no idea why if I just replace them the switches with MOSFETs it doesn't work anymore. As shown in the screenshot if I replace the NMOS for the S1 PWM as well as the S4 PWM, my DAB...