Questions tagged [switches]
Devices to interrupt or route a signal or power one of several ways.
3,454
questions
0
votes
0
answers
46
views
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 ...
- 939
0
votes
0
answers
42
views
Power supply auto cut-off required when there is no audio signal
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 ...
0
votes
1
answer
37
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 ...
0
votes
3
answers
153
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 ...
- 1
0
votes
3
answers
71
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 ...
-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 ...
0
votes
1
answer
76
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-...
- 49
3
votes
1
answer
63
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 ...
- 478
0
votes
0
answers
52
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 ...
0
votes
1
answer
53
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. ...
- 1
1
vote
1
answer
39
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 ...
- 3,431
0
votes
1
answer
34
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 ...
0
votes
1
answer
46
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 ...
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 ...
- 13
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 ...
0
votes
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 ...
- 361
0
votes
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 ...
- 69
0
votes
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:
...
- 3
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 ...
0
votes
1
answer
43
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 ...
- 317
0
votes
1
answer
67
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 ...
0
votes
1
answer
55
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 ...
- 3
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 ...
- 59
0
votes
1
answer
56
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 ...
- 115
0
votes
1
answer
82
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. ...
- 105
0
votes
1
answer
46
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 ...
- 49
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 ...
- 31
0
votes
0
answers
67
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 ...
- 145
0
votes
3
answers
65
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 ...
-4
votes
2
answers
189
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 ...
- 16.7k
-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 ...
0
votes
1
answer
65
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 ...
- 3
-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.
0
votes
0
answers
77
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 ...
- 83
0
votes
0
answers
20
views
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 ...
- 1,622
0
votes
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-...
0
votes
1
answer
37
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 ...
- 478
0
votes
2
answers
39
views
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 ...
- 51
0
votes
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 (...
3
votes
4
answers
137
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 ...
- 49
1
vote
1
answer
58
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 ...
- 435
0
votes
1
answer
150
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 ...
- 1
-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, ...
- 3
-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 ...
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 ...
- 187
1
vote
2
answers
60
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 ...
- 25
0
votes
0
answers
92
views
SPNO momentary rocker switch - purpose of 3rd terminal?
I am trying to solve a mystery with a coffee grinding appliance I purchased from a European company. It is made for the U.S. market (120v), and at its core is a simple motor controlled by what I ...
0
votes
1
answer
67
views
How can I make a switch using a MOSFET to control an input signal? [closed]
I have a two channel relay module that takes 12 V to power. It also has two inputs, which take either 12 V or 0 V. On the other side of the module are the NC and NO and COM pins that I am connecting ...
- 115
0
votes
0
answers
40
views
Tapping in between a brake lever and an e-bike controller
I'm designing a piece of hardware that resides between an e-bike controller and the brake lever.
The difficulty is that the battery voltage is unknown and can be between 36-52v.
simulate this circuit ...
1
vote
2
answers
65
views
Convert falling 5 volt signal into latch circuit trigger [closed]
I want to detect when a micro controller board has lost its wall PSU power, and use that knowledge to move it to a battery back up.
Specifically, I want to use a latch circuit like the one ...
- 111