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Questions tagged [switches]

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

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Guitar pedal mod - trigger button presses from a microcontroller by shorting the switch contacts?

I have a guitar foot-pedal (Boss RC-300) and in order to do a lot of the navigation and configuration of the pedal I have to keep crouching / bending down to change patches or change settings. I would ...
Boloar's user avatar
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2 answers
79 views

Using a three terminal PCB slide switch for on/off control

Most of on/off PCB slide stiches has 3 pins(terminals). And I want to use this such switch as on/off switch for the following part of a circuit: Above SW1 is the 3-terminal slide switch I want to use ...
user1245's user avatar
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31 views

Convert PWM negative signal to either On or Off signal

I am trying to make a simple conversion circuit to take a negative PWM signal from my cars dome lamp signal and simply make it or or off. I believe I should be able to use a PNP transistor and ...
Jaxon's user avatar
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1 answer
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For a disabled person's ring, how might a switch be added to the device that is waterproof and totally durable?

I have to cram a lot of electronics into a very, very tiny space. Microcontroller, battery, charging circuit, sensors, display, and an activation button into a ring on my finger. It's a device for ...
user30997's user avatar
  • 408
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0 answers
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PCIe Switch Doesn't Detect U.2 NVMe [migrated]

I am trying to get a U.2 NVMe (FIPS 140-2), Gen 2 (1x4) to get detected by our CPU conga-MA7 (COME 3.0 Type10 form factor). In between I have a PCIe Switch (PEX8718-AB80BI G). I am only using 2 lanes ...
miggyEE's user avatar
  • 95
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1 answer
55 views

Switch Protection

I am using SPDT and multiplexer switches in my design and these switches are directly connected to Px connectors for various channels. Transducers (capacitive load below 500 Ω) are connected at Pin 2 ...
user135156's user avatar
6 votes
2 answers
293 views

Analyzing Diode Quartet Switch

I am trying to understand how this diode quartet switch works. I am having trouble dealing with the two current sources. I can think about what happens to the voltages in the circuit, but how do I ...
Axodarap's user avatar
  • 157
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1 answer
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Switching a low current/low voltage line with a high current/high voltage one. (Detecting current flow)

I am working on a design for an model rocket launcher. I have an Arduino Nano Every in the design, and am hoping to use that of the continuity test. When the user presses the cont. check button, it ...
Elijah's user avatar
  • 3
6 votes
3 answers
724 views

IGBTs fail after high current, high voltage switch, despite being lower than absolute maximums mentioned in datasheet

I'm using FGH60N60 IGBT as a switch. The circuit is basically a capacitor-discharging circuit. I have a 10 mF capacitor charged to 310 volts and connected to 2 Ω of load via this IGBT (I connect 4 ...
pouya nosratkhah's user avatar
-1 votes
0 answers
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Switch Realisation MOSFET in Push Pull Converter

I am doing the power electronics course at my university and am having troubles with the MOSFET switch. The MOSFET switch should conduct reverse current even when the gate is not biased (MOSFET is off)...
Mohammed Osama's user avatar
-1 votes
2 answers
91 views

Typical output characteristics table of an NPN transistor

The Ic - Vce table for the 2SC2411K transistor is given below. As it is known the right side of the table represent the breakdown region. That is, does the Vce > 5 V region enter the breakdown ...
Mhan's user avatar
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2 answers
102 views

BJT circuit questions

I have landscape lights. The load is 3 VDC 100 mA for each filament. I have two of them so the load is 200 mA at 3 VDC. I have solar panel which varies voltage from 0 V to 1.5 VDC. I want the ...
hhsting's user avatar
  • 45
1 vote
1 answer
45 views

Selectively Activated External Circuit for ADC Measurement

I'm looking for efficient yet simple-to-integrate solutions where analog signal outside of microcontroller's range is being measured (e.g. 12V power supply) and measurements are done selectively. This ...
lucenzo97's user avatar
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3 votes
3 answers
161 views

How to light up a rocker switch powered by a battery of only 1.5v?

I have a small hobby project for which I wired 4 AA batteries in parallel to achieve the desired result, which comes to 1.5V, as the batteries are in parallel, which is what works for my project. My ...
electrical's user avatar
1 vote
2 answers
85 views

How to eliminate voltage spike when power supply is switched on with mechanical switches

Let me set the scene first: we have a special racing vehicle, where the power souce is a 12s Lipo battery pack (Nominal Voltage = 48V, Maximum = 52V). The battery is protected by our own Battery ...
István Kecskeméti's user avatar
0 votes
3 answers
60 views

What is the purpose of SW1 in the schematic for a battery gauage IC

Does anyone know what the purpose of SW1 is? The schematic says LED Display but I do not see how this is used for the LED display. The datasheet is found here.
JoeyB's user avatar
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2 votes
1 answer
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Would This Be a Good Bipolar AND Gate?

In my last question, I asked about this schematic that I made: My question was answered and I got some good advice, so I recreated the circuit with the new knowledge in mind, which looks like this: ...
Sqidy P's user avatar
  • 67
1 vote
0 answers
42 views

Hot-swappable battery in series

I'm trying to figure out a circuit to power a robot with multiple BLDC actuators, with two 6-cell LiPo batteries and would need some advice on safety and possible power switching. Please pardon my ...
Greg's user avatar
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1 vote
0 answers
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Double Vs Single Bow Tie Transmission Gate Symbol

Is there any difference between two symbols (at the below link) or there totally identical at a functionality level and the only difference is visual just for aesthetic purposes? https://en.wikipedia....
DarkKnight's user avatar
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Switch Symbol on a Datasheet Block Diagram [duplicate]

I have seen quite a few times in datasheets this switch symbol (at the red circle on the attached picture) on block diagrams. Do you know what is his formal name and if it isn’t a “simple” switch (...
DarkKnight's user avatar
8 votes
1 answer
1k views

How can I make this AC current switch turn on at 20mA instead of 50mA?

I've bought this AC current switch, which is sensitive to currents from 50 mA to 5 A on the single AC wire that passes inside its hole. When currents from 50 mA start to flow in the wire, it allows ...
Rodrigo's user avatar
  • 567
-1 votes
1 answer
63 views

Used Transistor as Switch LED

I designed simple circuit using transistor as switch for my led. I used npn transistor. The input voltage is 46V. The current input is 15mA. My question is my circuit is correct or not?
Kim's user avatar
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1 answer
66 views

Single momentary switch to control latching relay

I'm interested in using a single momentary push-button switch to control a latching relay. The idea is for the switch and relay to function as an on/off switch for a high-wattage load (13.8V DC, max ...
Jonathan W.'s user avatar
0 votes
1 answer
52 views

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
  • 524
0 votes
1 answer
43 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
  • 1
0 votes
3 answers
234 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
1 vote
3 answers
118 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
1 answer
59 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
84 views

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
1 answer
74 views

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
  • 524
0 votes
0 answers
83 views

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
0 votes
1 answer
98 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
70 views

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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0 votes
1 answer
40 views

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
0 votes
1 answer
50 views

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
66 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
75 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
0 votes
2 answers
42 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
0 votes
3 answers
77 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
0 votes
1 answer
37 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
  • 3
1 vote
2 answers
78 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
0 votes
1 answer
59 views

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
0 votes
1 answer
80 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
0 votes
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
0 votes
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 ...
Confused's user avatar
  • 2,483
0 votes
1 answer
60 views

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
  • 109
0 votes
1 answer
83 views

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
0 votes
1 answer
50 views

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
  • 49
3 votes
5 answers
197 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
0 votes
0 answers
73 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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