Questions tagged [switches]

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

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How to distinguish which buttons have fixed on/off positions similar to a flashlight button?

I'm searching for a button/switch similar to one on a common flashlight: you click the button to turn the light on, then eventually click it again to turn off. Example clip of Button (Adafruit / ...
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Automatic Timer Solar Cutoff [migrated]

My inverter insists on trying to get the last few rays, even when the inverter is really seeing 0A. With the lithium battery things are worse, in that the custom "back to grid" settings are ...
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-1 votes
1 answer
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MOSFET circuit to trigger timer. Any additional safety additions to circuit required?

I want to trigger a timer (Omron H3DK-M2) using a circuit based on a MOSFET as a switch. The data sheet for the timer states "When using a 24 VDC power supply voltage there will be an inrush ...
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30 views

Transistor Switch Output Current Increasing

I'm using a BJT switch to send a 48 V, 2.5 mA signal (thanks for all the help in the past!). I've been tuning the resistance value I need to output 2.5 mA and noticed that the output current is ...
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An over- and under-voltage protection system

How can the block diagram below operate as an over and under voltage protection system? I thought it will work as follows: A step-down transformer is used to bring down the alternating current supply ...
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What momentary switch should I use?

I want a switch that has 2 distinct non-momentary states (say UP and Down) and a momentary state. In both states (...
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1 answer
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What could be wrong if neutral has power?

I tried to connect a smart switch to my exhaust fan, and probably connected the wires wrong the first time. Now, I find that with only the red wire connected to the switch, the black wire also shows ...
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1 answer
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Simplest solution to automatically turning off dash cam when ignition is off, but turn it on with button?

I recently purchased and installed a dash cam in my vehicle (large truck). It requires three connections: ground, constant ~12V, and ignition/accessory ~12V. I have connected the dash cam to ...
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3 votes
2 answers
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Circuit that switches on at 4V and off at 3V

I'm new to circuit design so please forgive any misstatements. I'm wanting to create a circuit that turns on a device (mini water pump) when a voltage hits 4V or higher and turns off the same device ...
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2 votes
3 answers
105 views

Vending machine motor: simple DC motor with microswitch, one revolution

Long story short, I'm currently trying to understand and control a DC motor with connected microswitch, which gives back one-revolution feedback (don't know how). I tried connecting INA219 current ...
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8 votes
2 answers
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What kind of tactile switch is this?

I am trying to find some tactile switches similar (or even better, identical) to the ones shown. They are two stage, multi-way configuration. Depressing one click connects the common pin to pin 1, and ...
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How to wire one switch that can turn on/off two independent switches [closed]

In my car I wired in a Front View Camera (Camera-A) that has it's own toggle switch (S-A) to manually turn it on/off, and has it's video displays on my Head Units Display. I also wired a Backup Camera ...
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6 votes
3 answers
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How can a reed switch be used for high current applications?

I am planning to use a reed switch as a power switch in my underwater robotics project. The switch will be placed between the LiPo battery (16.8V, 20.8Ah) and the load. The load mainly consists of two ...
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1 vote
1 answer
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Switching stereo input between three stereo outputs

I have a circuit I'm designing which will switch a stereo audio input signal between a total of three possible outputs: 1 - Dry (i.e. the signal will go straight through without being effected), 2 - ...
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10 votes
8 answers
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What is the ideal method of sensing whether 4 points on the bottom of a device are all depressed to indicate contact?

I am trying to place a sensor or switch on each corner of some desktop PCs so that if they are lifted an event is triggered like locking the computer or encrypting it. So far I have considered small ...
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4 votes
3 answers
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Why is this transistor in my bootstrap driver failing?

I'm trying to implement a bootstrap switch circuit for an N-channel high side switch. I implemented the following circuit on a breadboard: Testing it with a 24V power supply and a grounded input ...
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Lava lamp UK to CANADA [migrated]

I've recently buy a lava lamp and it only works for EU, all of it is 220-240V. First I've buy the plug adapter (not converter for V) the light bulb is 240V R39 E14 30W, and it doesn't exist in 120V, ...
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Admittance matrix when switch is open

In the following there is an example of an admittance matrix. https://en.m.wikipedia.org/wiki/Nodal_admittance_matrix If y13 had a switch and it is open, what happens to the admittance matrix? Thanks
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2 votes
2 answers
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Two power sources and two outputs with one switch

Hi I'm new to electronics and have little idea how electricity works. I have a motorcycle and wanted to add two LED lights. I want to have one switch in both LED but with different sources. The first ...
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1 vote
1 answer
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Switch stuck in closed position

I'm repairing and old board that had a problem with its power switch, a C&K NE182UEE6AMP DPDT switch for 250V/6A (https://www.ckswitches.com/media/1409/ne18.pdf). I found a replacement and ...
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1 answer
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best 5v switch with 3.3v

i have a kobo with a serial port output providing 3.3v when the device is turned on. i want to use it to control a microcontroller 5v board with esp32 on it drawing max 200mA directly from the battery ...
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Switching between two circuits with DPDT with minimal current consuming

I am trying to design a system that will be powered by solar panel and 3.7v lithium batteries only. Im not electrical engineer, ...
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2 answers
92 views

How can I combine 4 separate bits into one 4 bit output?

Say I hypothetically have four switches 0-3. I want each switch to represent a bit in a four bit long number, switch 0 being the first bit and switch 3 being the last. The end goal is to be able to ...
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1 answer
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Ethernet Switch configuration mode

I'm trying to understand the Ethernet Switch product. On page 54,55, we can see that, the MAC signals, Like for MII and RMII interface, we can understand that the digital MAC port 3, can be configured ...
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1 vote
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Switch off 2 power supplies using a single switch in a feedback loop

We have setup a solar stairwell project at home, using LED and salvaged batteries and this is what it looks like: However it may look, the circuit can be oversimplified to: simulate this circuit &...
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1 vote
2 answers
74 views

Momentary switch to activate 555 timer

I am very new to circuits and I've tried everything online but nothing seems to be working. I am making this circuit for a class. I am trying to emulate this circuit diagram from this youtube video ...
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1 answer
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How to use a small board computer's gpio to close a switch on an external device

I'm using an Odroid XU4. It outputs 1.8V on the GPIOs. I have a USB2 Hub connected to it which has its own power supply (connected, alongside the Odroid to a pico PSU). Problem is, it has a physical ...
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Ethernet Switch IC

I'd like to understand a little more on the Ethernet switches. Consider this Ethernet Switch which is a 3 port switch. Like, it has 2 copper ports and one digital (MAC side interface) port. It is ...
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-2 votes
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Ethernet switches

What does it mean when it is said that Ethernet switches are "Non-Blocking" This is with respect to KSZ9893 ethernet switch.
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2 answers
39 views

Help with capacitive touch button output configuration

Can someone help me with the basic working of this capacitive touch switch? I know it isn't very complicated but I just can't get over my brain block of what actually triggers when the button is ...
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-1 votes
0 answers
64 views

Switch and diodes

I have this schematic with pic18f47k40. In this project I have 6 switches, a pic18f47k40 microcontroller and dfplayer to play music. I want that when I press a switch, the microcontroller tells ...
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Soldering panel mount switches to PCB

I am new to the PCB design and PCBs as a whole. Is it possible to solder panel mount switches with solder lugs directly onto the PCB, given that the PCB holes are suitable for mounting? (Rectangular-...
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1 vote
3 answers
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How does the most effective circuit control multiple contacts with a rotary switch?

I will create an electrical circuit to turn on the LCD in 2 ways, namely through the microcontroller and through the header pin. If I rotate the rotary switch to the left then all LCD pins are ...
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Electronic antispark plug (MOSFET I think?) stays always closed

I'm trying to setup a remote electronic switch for my lighting system which consists of a constant current driver and an LED. When working at full power around 6 A at 52 V go through the switch. What ...
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PFET switch design not behaving as expected

I'm trying to use a P-Channel MOSFET as a shutdown switch for a logic circuit. I have what I want working in isolation, it looks like this: These are the voltage curves: As you can see, the initial ...
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3 answers
49 views

wire rotary switch with leds that turn one at a time

I have a 9V battery, a rotary switch (one pole, 5 positions), and yellow LEDs (2V drop). How can I wire it so that as I rotate the switch the LEDs turn and stay on until I reach the end of the switch? ...
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How to control multiple current paths from one physical switch?

I am working on a college project for my Analog Electronics class as part of my music technology class. I want to create a synthesizer where buttons can control Rf to change the oscillators frequency, ...
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2 answers
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How to commutate quarters of a sinewave

In the image bellow you can see a sinewave, it is from a 20V, 50Hz system. You can see four loads, 1 to 4 which I need to switch on and off every quarter of the sinewave. Could you please advise how ...
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1 vote
3 answers
119 views

Escape room: How how to switch between lamps?

I’m building an escape room and have a little puzzle here… There is a lamp normally turned on when the people enter the room. When they solve a puzzle by putting a magnet in the correct place, I want ...
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2 answers
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DPDT button latching switch

i am having a cool idea when i turn on my pc i want my monitor to come out of th desk using a linear actuator. The problem comes with the switch, for the linear actuator i need a DPDT switch, but the ...
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2 votes
3 answers
135 views

externally actuate a membrane switch

Is there a standard or recommended way to externally actuate a membrane switch? Context: I'm trying to interface a programmable controller board (arduino or cousins) to an existing consumer appliance (...
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-1 votes
1 answer
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Clap switch circuit too sensitive

I followed the clap switch circuit in this youtube video. The circuit is always ON. I replaced the condenser microphone with a photoresistor and the circuit is still ON. Which part is making the ...
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110V 25 ampere switch research

I am looking for a solution to cycle power to a pump. Below, I am referencing the thought on this device as the 'solution'. Situation: I have a 110V 25A (maximum draw under load) pump that is ...
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3 votes
3 answers
88 views

Delayed switch (closed for three seconds then open)

I have server that won't power up. I found that if I connect a 50Ω load to the +12 VDC output of the power supply everything works fine. I only need this additional loading for about three seconds. I ...
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1 vote
2 answers
65 views

Equivalent Switch 4A 1/3 HP for hedge trimmer

My hedge trimmer died (Bosch 7000 Pro). Switch not working properly (spongy and no audible click). Need to replace. Question: I can't find this switch anywhere! Are there equivalents I could use? I'm ...
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Marvell 88E6097F switch and AR8033 PHY

I'm trying to design a 6-port Fiber switch. For this I chose the MARVELL 88E6097F which is an 8-port switche+3GE. My problem is that the CPU (IMX8M-P) comes out from the SOM with a PHY (AR8033). Is it ...
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0 votes
2 answers
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What's the proper name for the kind of rope switches you find in toys like teddy bears?

I'm looking for the right name of the switch or mechanism that is often found in older child toys like teddy bears. It's basically a rope which can be pulled at and when released the bear would 'say' ...
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4 votes
1 answer
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Unclocked NOR gate SR latch not latching [closed]

I am starting to learn computer architecture and decided to try building an SR latch using NOR gates and without a clock (basically copying this video) on a breadboard. My circuit is pictured, it is ...
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71 views

How to switch between two voltage sources?

I'm trying to design a circuit to switch a voltage source between 12V and 24V for a load that draws 400mA. Initially I thought I could use a SPDT analog switch but the ones that can tolerate >24V ...
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2 votes
1 answer
138 views

Why is switching off GND instead of VCC a bad idea in battery powered application

I'm currently tasked with designing a battery-powered device (i.e. it will be connected to two four-cell LiPo batteries, each with a voltage of 14.4V to 16.8V) and am having quite a hard time finding ...
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