Questions tagged [switches]

Devices to interrupt or route a signal or power one of several ways.

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FET selection and quantity for buck-boost converter design

I am working on designing a buck-boost converter where the input voltage is 24 V regulated, and the output voltage ranges from 12 to 48 V with a current rating of 5 A. The design should also allow for ...
chami's user avatar
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Why does tester glow both on neutral wire and ground wire? [closed]

For the first time I did some domestic wiring and everything was done correctly(100%)but when tested with a tester,it glows on all three wires but it glows much brighter on live/phase wire
Wetshelhi Rhakho's user avatar
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Help needed on finding timer [closed]

Okay I have to make a traffic control system for a youth organization I belong to. The building we have has two gated entrances we want to build a "traffic control" system, two units ...
Martin Sigsworth's user avatar
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1 answer
41 views

How to make a current sensing circuit for oxygen concentrator to generate alarm when no current on cord [closed]

The plate on back of my wife's oxygen concentrator reads 120 VAC, 60 Hz, 6 A. It seems like the amps must fluctuate when it sounds like a pump turns on every 7 seconds, but the unit runs constantly. I ...
Bobser's user avatar
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How can I fix a hand drill that got too hot and now only turns one way? [closed]

I was drilling some screws and my hand drill electronics burnt on the clockwise side of the switch. I can only loosen screws now. It is a simple switch that goes straight to a motor. I have a feeling ...
bandybabboon's user avatar
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61 views

Power supply auto cut-off required when there is no audio signal [closed]

This is an add-on amplifier and speakers I've installed in the hourly chiming cuckoo clock and attached clock speaker output as an input source to PAM8403, all is working great with quality sound, the ...
Nayan Panchal's user avatar
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1 answer
38 views

Switch to place stereo volume pot before main circuit, after main circuit, or bypass volume pot altogether [closed]

I'm building an audio box and would like the option to place attenuation before the main guts of the circuit, or after, or bypass the volume pot altogether. The audio is a stereo signal, coming off ...
user370264's user avatar
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3 answers
162 views

What will happen if a bulb is connected to two live wires?

In the two-way switch below, the bulb can be connected to either two hot wires or two neutral wires to turn it off What will happen if a bulb is connected to two live wires? Will the current flow ...
Rin Hoo's user avatar
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3 answers
79 views

Unexpected Overshoot with Switch Bounce

I am measuring switch bounce on a breadboard with a simple push button switch in series with a 100K resistor. Circuit power is s 3 channel Siglent SPD 3303C. Measurements completed with a Rigol ...
luther_stanton's user avatar
-1 votes
2 answers
53 views

How do I flash LED with signal from 555 timer ONLY when button is pressed?

I am trying to make a circuit in which an LED is off until a button is pressed, and then it flashes with a 1Hz signal from a 555 timer. Currently, its default state is flashing with 1Hz and when the ...
Chandler Thornton's user avatar
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1 answer
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Driving a power MOSFET successfully

I have recently purchased this power MOSFET for a project (dump load resistor): https://uk.rs-online.com/web/p/mosfets/6867852?gb=s Alongside this I have bought a MOSFET driver see link: https://uk.rs-...
Jasper's user avatar
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3 votes
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Voltage drop issues in LTspice simulation for buck converter using SW model

I have a LTspice design issue where I encounter the same problem, even when I use other available simulations. Whenever I increase the load, there is a significant drop in voltage, despite having ...
chami's user avatar
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Single Switch with Momentary and Latching/Hold Properties Using CMOS/Logic (no µP/microprocessor)

I am looking for a CMOS/logic based solution (no µP/microprocessor) to a momentary switching scheme I'd like to implement that involves the following scenario: 1: pressing a momentary switch engages ...
paraparabolic's user avatar
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1 answer
56 views

Float Switch and relay for pump

I have a pump that's only required for the occasional use with excess water, - https://www.al-ko.net.nz/alko-product-range/sub-6500-classic - and this is only required when the water is 50-70mm deep. ...
MPG's user avatar
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1 vote
1 answer
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Charge batteries in parallel, discharge in series

I'm interested in building lithium ion battery packs, and I was wondering if there is a way to change the pack on the fly from series to parallel - basically to allow charging in parallel and ...
Alex I's user avatar
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Switching power and controlling RPi GPIO pins with a single rocker switch

I have a 12V amplifier board with the sound source being a raspberry pi. I'd like to have a single rocker on/off switch that both turns off power to the board, as well as connect to the RPi GPIO pins ...
youcloudsofdoom's user avatar
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1 answer
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I could not manage to use Switch Component in LTspice

There is a circuit to control a pwm signal with a switch in Ltspice. But it does not switch of despite to off mode of controller voltage. Is there anyone to give me some suggestion. My and gate ...
Mr.JuniorEngineer's user avatar
1 vote
1 answer
64 views

Need help identifying a rotary switch component

I've tried all kinds of rotary encoders and rotary switches, but none seem to match this one exactly. It is from an old car radio (many radios have them). When rotated, the current flows through one ...
Programmer's user avatar
1 vote
1 answer
74 views

Circuit for rebooting by pressing momentary switches [closed]

I don't understand the schematics for this rebooting system based on pressing momentary switches. They are the schematics of Flipper Zero. (I am trying to look some schematics online to start ...
Leonardo Rosati's user avatar
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2 answers
30 views

Seemingly dielectric grease in my rotary switch

Look at the picture of my teardown of the SP10T I ordered quite a while ago from DigiKey, https://www.ckswitches.com/media/1349/arotary.pdf. Opening it, it's got grease on the contacts. Much more on ...
Tempus Nomen's user avatar
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3 answers
71 views

How does one connect a DPDT Push switch?

I am using a MHPS2273 DPDT push button in my design. The purpose of this switch is to turn ON the device when I press the button. If I again press the button it will turn OFF the device. I am confused ...
Kuralmozhi's user avatar
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1 answer
36 views

ESP12 to switch computer power

Hi all! I'am trying to use an ESP12S to turn a desktop computer on/off remotely, using a NPN 2N2222 transistor, while also trying to keep the physical power button working. Much like this project: ...
SnackK's user avatar
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1 vote
2 answers
70 views

Low power toggle switch

I have used a 555 to toggle output on/off from a push button pulse and was wondering to use something similar to TTP223 due to its low consume once with 555 have more than 10mA in standby, anyway ...
Daniel Pechmann's user avatar
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1 answer
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Searching for a high side switch with integrated current sensing [closed]

I am building a high side switch circuit for an automotive application and I need to be able to read the current through the switch. The circuit is powered with a 24V battery and the expected load ...
Gabriel Corrales's user avatar
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1 answer
68 views

How to use one USB-C port between 2x ESP32-S3 - Switched by toggle switch?

I am trying to switch over a USB and it's associated Data +/- traces with a physical toggle switch. I've tried to work out how to do it with just the switch, but I don't think that would work as it ...
happycamper1221's user avatar
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1 answer
56 views

Transistor as a switch with square wave input [closed]

I want to construct a circuit that contains a transistor and a LED. I have a supply square wave input voltage(0-5v). Help me to construct a circuit when input is 0v ,if LED on and input is 5v then ...
YM Black's user avatar
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0 answers
50 views

Electromechanical solution for opening the charging port of electric vehicle

Below image shows the charging port of my ev. Currently if I want to charge the vehicle I will manually open the port cover(the white color one in the image). My intention is to place a switch in the ...
Analogkid's user avatar
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1 answer
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What's the name of the device that reverses on-off state based on second power input on-off?

Specifically what I'd like to achieve is find an electronic switch that connects to a car's ignition system and that has a second circuit in it that is kept active (on) when the ignition is off, and ...
MaxZ's user avatar
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What kind of switch is this surface mount component with no actuator?

One way I am learning about electronics is to try to analyze the function of random small circuit boards that I come across. I found a device with a component labeled SW2, so likely it’s a switch. ...
Travelling Man's user avatar
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1 answer
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How do I successfully drive this MOSFET for a dump load resistor with a wind turbine?

I am constructing an AC-DC Rectifier with dump load control for a wind turbine (see Schematic for info). The following use cases are required: Rectifier rectifies AC into DC and provides energy to ...
Jasper's user avatar
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3 votes
5 answers
195 views

MOSFET keeps detonating

I am building a power switch for rocketry usage. On the outside of the rocket is what we call a screw switch. I am not comfortable with all the current running through the screw switch, so I built a ...
Toe-Knee's user avatar
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0 answers
68 views

High voltage high power low side mosfet switch - anti spark circuit

I have made an Aniti spark circuit based on https://github.com/msglazer/Anti-Spark_Switch My version however is made to work with up to 200V and hefty current at that (4x IRF200P222): Circuit does ...
Kaminari's user avatar
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3 answers
67 views

Modify headphone jack to not mute speakers when plugged in (Yamaha HS4)

I have a set of speakers with an additional stereo headphone output on the front. As it is now, when the headphones are plugged in, the speaker mutes, giving output to the headphones alone. I want to ...
Noah Taher's user avatar
-4 votes
2 answers
190 views

Which is better - series or parallel rectifier? [closed]

The idea for this question gave me the question Understanding positive and negative rectifiers. Here I want to summarize the ideas behind the two circuit configurations - series and parallel, hoping ...
Circuit fantasist's user avatar
-2 votes
1 answer
33 views

TinkerCAD Digital Logic LED [duplicate]

I finished building this circuit in TinkerCAD, but for some reason the AND gate won't behave like it's supposed to. Shouldn't the LED turn ON when both 1 and 2 are ON? Instead, it turns ON when both 1 ...
user367142's user avatar
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1 answer
68 views

Wiznet W5100 and Realtek RTL8363NB-VB-CG board issue

I've built a PCB connecting one of the ports of the RTL8363NB-VB-CG to the W5100 mimicking a ethernet cable on board, I used a RP2040 a Wiznet 5100S-L and the Realtek RTL8363NB-VB-CG.The problem that ...
TFO's user avatar
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-1 votes
1 answer
40 views

TinkerCAD Digital Logic

Everything here seems to be right, like the gates and resistors, but the gate seems to be the issue; the LED is off when the switch is on. What is the issue? I have also included the schematic.
user367142's user avatar
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0 answers
78 views

Is this a correct way to use transistors as an LED "switchback" circuit?

I'm not a confident electronics degisner/user so I'd like to check with a knowledgeable community if this cuircuit would be safe and correct to use and if there's a way that extra protection should be ...
Bliss's user avatar
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0 answers
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Can I use a group switch to bypass a PV inverter?

I have an PV inverter which takes power input from the main grid and the PV modules/battery Depending on availability, the power output to my house will be a mix of these inputs. In a usecase I want ...
arminb's user avatar
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0 answers
27 views

Switch setup to power on/off PC

I have a project which contains a PC connected to an Arduino R4. The PC is enclosed in a cabinet and I can't open it (easily) to power it on. Normally I would run a remote wire to the button to power-...
ElectroRag's user avatar
0 votes
1 answer
38 views

Switch Selection in Buck-Boost Controller Designs

I have reviewed several buck-boost controller designs, including the LT8390 nd I am puzzled by the selection of different switches for the buck and boost sections. For instance, on page 27, the ...
chami's user avatar
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0 votes
2 answers
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Will back EMF be a problem when operating a solder fume extractor with a foot switch?

I have an Xytronic HV-2 solder fume extractor. Operating it is cumbersome since I have to crawl under my desk to switch it on and off each time. I'd like to add a foot switch for easy operation. I ...
Peter Panda's user avatar
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0 answers
42 views

Does my GPIO Expander have a floating pin? [Button and pull-up resistor]

I am using GPIO expanders (MCP23017) for an array of buttons. Each button is connected between GND and an input pin of the expander. I've enabled the 100k internal pull-up resistor on the MCP23017 (...
Nate.Olson's user avatar
3 votes
4 answers
140 views

MOSFET Driving for a Dump Load Resistor within a wind turbine

I am currently designing an AC-DC rectifier for a 6 kW small-scale wind turbine. As part of this setup, I intend to integrate a dump load resistor to regulate overvoltage. When the DC voltage reaches ...
Jasper's user avatar
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1 vote
1 answer
59 views

Making a circuit switch using MOSFETs

I am trying to control the choice of 2 circuits using MOSFETs, at logic levels. Basically, I’d like to have one circuit feed bits to an IC in some conditions and another circuit do the same in ...
Fed's user avatar
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0 votes
1 answer
151 views

Discharging capacitor after power shutdown

I've got a simple circuit that acts as a 230V softstart: It works, but there's one issue with it - after turning it on a 100uF capacitor is charged, and after turning off it is discharged by a 22k ...
fexr3i's user avatar
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-1 votes
1 answer
52 views

Do I need to use DPST for two loads? [closed]

In the circuit shecmatic, the switch is an DPST switch, the input pins are in parallel. I look for the advantages of DPST, it is mainly used on independant circuits. If the input is not independant, ...
SY Mak's user avatar
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-1 votes
1 answer
46 views

Make mechanical switch panel smart (or how to electronically push buttons) [closed]

I do have a control panel in our camper van. It has four push buttons to turn on and off certain functions. I now want to add an ESP32 to make this panel smart and allow me to remotely control the ...
Rudi Rüssel's user avatar
0 votes
2 answers
132 views

What is the purpose of these mercury switches?

I'm looking at a vintage wire recorder that won't even turn on. Examining it, the power leads (both of them) go through separate mercury switches and on to the main transformer, etc. The switch vials ...
noughtnaut's user avatar
1 vote
2 answers
61 views

Powering multiple loads at same voltage with separated DC-DC converters

I'm working on the power distribution PCB of a battery powered robot with multiple loads at 24V, 12V and 5V. My idea is to use a big 24V converter, and then another two smaller converters to go from ...
Pablo Daniel's user avatar

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