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Questions tagged [switching]

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Switching can be defined as the change in state whether it be an analog, digital, or mechanical device. For digital devices, switching can be defined as a transition from HIGH to LOW or vice versa. For analog devices, switching can be defined as a change of operation within a transistor. Mechanical device examples include physical light switches or button switches. Ultimately, switching interrupts current from going into another conductor path.

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LTC7000A datasheet suggests that it works for the wide input range of 3.5V to 135V Vin. But in my application, I am facing an issue with the MOSFET switching at lower voltages. In my design I have ...
Akshaya Kumar's user avatar
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Maybe it's very dumb question. But I'm just curious. For example I have On/Off switcher for some LED for indicate that you can start using some device. So this LED turning On from MC and signal rising ...
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I have a soft PCB with a tiny switch on top of which I want to add another switch (a mosfet). What would be a good practice to do so? Just solder threads (hypothetical, in blue in the picture) ...
Soleil's user avatar
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I am designing an electrical discharge machining arc generator circuit. It uses power MOSFETS and power diodes (600 volt/30 amps regime). I am making extensive use of QSPICE for simulation (great ...
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Disclaimer: Sorry for my ignorance - I'm a computer scientist but not an electrical engineer. It seems at first glance that this designation should be the other way around. N-type MOSFETs have the ...
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I have an application where I need a gate of somekind for both switching a higher current than my MCU I/O allows(5mA) and to prevent current leakage from said MCU pin (My application is at around ...
Boyfinn's user avatar
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I have disassembled a 20V cordless drill. It uses a two-lead brushed motor controlled via a PWM signal. Out of curiosity I connected both motor leads to an oscilloscope and measured both against a ...
user516079746's user avatar
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I might be having a slightly dense day, but in an answer it was stated No need to add diodes for back emf worries because you'll be driving the primary with a voltage signal and not trying to switch ...
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I'm designing a board with BQ25620 and I'm trying to layout the output VSYS loop. On the BQ25620EVM User's Guide (Page 11) I ...
MrBit's user avatar
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The circuit shown below is used on one of my PCBs to switch the VBAT supply for the RTC, ensuring timekeeping continues whenever the main supply (VCC) is unavailable. Circuit Operation Under normal ...
MICRO's user avatar
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I'm working on a telemetry module and have doubts about the switching. I want to turn the module on/off using a rocker switch. To avoid a hard cut, I included a load switch. Intended behavior: When ...
HJ URBOSHI's user avatar
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I'm looking to switch the high power 600 A 76 V dc from a battery. So I was thinking about using 8 N-channel MOSFETs arranged in parallel. MOSFET: IAUA250N08S5N018AUMA1 (Mouser) Could you please give ...
Embeded Hawking's user avatar
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I am looking to build a buck-boost voltage converter. I came up with this schematic: simulate this circuit – Schematic created using CircuitLab Assuming that $$\frac{1}{f_{sw}}<<C1\cdot R2 ...
Root Groves's user avatar
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I am designing a little battery (small 1 cell lipo) powered device which will use an ESP32 micro to do some wifi things. Most of the time the ESP32 will be in sleep, but occasionally it will wake up ...
roli's user avatar
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I have a simple LED indicator tower with 2 colors, at 12 V DC. They are green and red. The brown wire is a buzzer. They all have a common ground: I was trying to wire it up to an Arduino (2 separate ...
Cheesus Toast's user avatar
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I have a few questions about the circuit below. It comes from the LabTool oscilloscope add-on board for the LPC Link2. It's purpose is to attenuate the input signal with a voltage divider, and then ...
Shane Allen's user avatar
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Is there a way to implement this 16 way high side switch with less mosfets but still only use 8 GPIOs? The switched rail is 5V and the GPIOs are 3.3V. Total current draw will be <500mA and only one ...
Charlie Skilbeck's user avatar
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I am currently learning about voltage mode and current mode control in switching buck converters. From what I understand, a voltage mode converter is typically considered a two-pole system, where the ...
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I know both are to be considered to for switching speeds and gate driving requirements, and I know Ciss is taken into account when a value for Qg is given in datasheets. but basing calculations for ...
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I’m considering this: Lets say I have 48V on the A side and a resistive load on the B side. I’m trying to understand what voltage my p-mosfets Vds are exposed to. My reasoning is that when the switch ...
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I created this circuit to switch ON/OFF DC 24V by using a pulse generator as the input. When pulse is high (1V), transistor is ON, and the MOSFET turns ON and delivers the 24V to the LED. Pulse low (...
GeneCode's user avatar
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I am looking to better refine a design I have for a circuit that switches between two voltage sources: one stable (3V) and one variable (1V-5V), and I would like to be able to control the rise/attack ...
paraparabolic's user avatar
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I'm trying to switch power to a servo using a 2N2222 transistor. My wiring diagram is as follows. I drew it up to resemble the physical connections on my breadboard (because I'm worried that I may be ...
kovac's user avatar
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I have an input signal of 24 V which can source some 5 mA from the proximity sensor.this signal needs to be given to microntroller. When the input signal from 5.1 V to 24 V the controller should read ...
Sinchana Gowda's user avatar
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I had a question regarding a project that I am working on. I am using a MOSFET for switching purpose and I connected two cells series to it. When I turned on the MOSFET I am getting the sum of the 2 ...
Sadhireddy Deepak Ram's user avatar
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I have an old car seat adjustment switch that has a forward backwards button, which I want to repurpose to control a 12v motor in the same way. Looking at the wiring there are 5 wires coming out of it....
Node Zero's user avatar
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I need to design a circuit driven by a function generator's square wave to switch between two large DC voltages in the ballpark of 10 Hz (one will be 300V which I'll call HV_L, the other will vary ...
bowlcutty's user avatar
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I have some LED strip lights hooked up to a simple transformer with a switch. Yesterday while I was extending the run of LEDs I had the transformer plugged in, but the switch off, but I noticed that ...
Foresight Reliability's user avatar
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I'm working on a project that requires switching on a 24Vdc solenoid-based load using a 3.3Vdc GPIO from an FPGA. The solenoid-based load draws between 150mA-200mA when 24Vdc is applied to it. I've ...
EE Turned Physicist's user avatar
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In the supply switching circuit shown below, where an NPN transistor is driven by a microcontroller (MCU) output pin, I would like to clarify the purpose of the 10nF capacitor labeled C144. Could you ...
Potionless's user avatar
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My test is: IGBT OFF and ON Time. I measured the IGBT on-time between the drive signal and the collector-emitter voltage, less than 1 µs. I measured the IGBT off-time between the drive signal and the ...
O.Blue's user avatar
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I'm trying to make a high side switch with a P-Channel FET, but the control signal is positive logic, so I need to invert that control signal to drive the FET's Gate pin lower than Source. So simply ...
jwhitmore's user avatar
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I'm interfacing with a product that has an output pulled to ground when an event happens. When this event happens I want to active a relay, which will stay on for a long period of time. When the event ...
user2059972's user avatar
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Imagine a P-MOSFET load switch. The Source is a 5 volt supply line. The Gate is connected to Ground so that the supply voltage is treated as the Vgs strength. Many P-MOSFETs have around 2.1-2.5 ...
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There are two types of LED strips: Analog LEDs: Uses a single positive wire, and one or more return paths for each color. Such as 5V+R+G+B. To change the color or brightness, you have to PWM modulate ...
Mitch McMabers's user avatar
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Maybe this one is a simple question for some with more experience then me. I am working on an ESP32 board and I designed simple voltage divider with one N-mosfet and one P-mosfet. I will be using this ...
Sinisha's user avatar
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The "load switch" I am building can switch (on/off) the power coming from 5v, 12v and 24v power supplies. The V_OUT load can be anywhere between 0-15 ...
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I am working on an undervoltage cutoff circuit using a P-Channel MOSFET (ME45P04) and a TDTC143Z transistor for switching. However, I am facing a serious overheating issue when the load current ...
Akash Kumar's user avatar
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As a follow up to my previous question here For the following circuit In his answer Fabio stated: During the ON time, Q1 Vce can never fall below its Vbe, since even if opto transistor ON voltage is ...
KarlKarlsom's user avatar
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I saw the other day a circuit that made me wondering: For a 24V output they designed it as following (my reverse engineered drawing): The outputs are switching a bunch of 24V valves around 3W each. ...
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I am having an issue where there happens to be a voltage dip down to 2.2V and due to the POR of the microcontroller which is set at 2.2V it would've dropped lower. ** What Happens :** 3V3 drops down ...
Sultanpepper's user avatar
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I am connecting 4 Raspberry Pi Camera Modules to a single CM5 using 2 TMUX646 MIPI multiplexers on a custom PCB. The MIPI side is straightforward, but I am stuck on the I2C connections. Each camera ...
Alex Rieser's user avatar
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My previous question on the topic was clearly improperly formatted and unhelpful. Problem: I'd like to use an Arduino, a separate 5V power supply, and 2 MOSFETs to drive a servo. The Arduino would ...
Taylor Spaulding's user avatar
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so I have the circuit below. The purpose: Switch live (240VAC, 16A) to a load. The switch is controlled by the optocoupler U104. The problem: When drain supply reaches 120V the bulb comes on ...
ItsFoobah'd's user avatar
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I'm attempting to create a simple circuit for instantaneous switching between two separate 3.3V digital input signals, based off of a single digital select signal. So: two digital ...
Runsva's user avatar
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How the control loop of the switching power supply dominates the tank circuit (output inductor and output capacitor)? And more importantly, why should the output tank circuit (L and C) dominate the ...
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I am trying to recreate the analysis from a paper published in 2008. I will try to provide a detailed understanding of what I was able to comprehend from the paper so that the readers don't need to go ...
MNA's user avatar
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As the title points out, I am needing to wire up an operational selector switch for connecting 120V supply to 2 different outputs. Let's call them 'Vibrator A' and 'Vibrator B'. The switch needs to ...
T. Paul's user avatar
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I'm building a simulation control panel for a PLC, where one side is potentiometers simulating thermistors (14), and the other side is digital potentiometers, controlled via a computer. The PLC uses ...
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I want to drive 4 very bright (0.5 W) LEDs but maximise battery life (try to minimise consumption). It's only on an RC model so my feeling (could well be wrong) is that so long as they operates at ...
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