Questions tagged [switches]

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

Filter by
Sorted by
Tagged with
2
votes
3answers
87 views

Switch design for shorting the power control pins?

I have been struggling to design this switch for a while and I would appreciate any help. Problem Background: I'm designing a power system for a submersible, using the Mini-box OpenUPS battery ...
0
votes
1answer
585 views

How to connect switches to power transformer?

I'd like to use two rocker switches, each is single pole and including a light bulb on the inside (230VAC) to control the powering the system. I'd like to connect both of them to the transformer with ...
1
vote
1answer
455 views

Latching power switch circuit

I am trying to understand: 1) how the following circuit works and more specifically how it turns on. 2) How to to modify it to get a hold on/hold off behavior instead of push on/hold off to prevent ...
0
votes
0answers
47 views

Can I wire a wall switch to my circuit?

simulate this circuit – Schematic created using CircuitLab Can a wall switch be wired to a DC circuit like these two circuits??
0
votes
0answers
33 views

Reverse polarity protection and enable function

The purpose of the schematic is, on the one hand, to provide reverse polarity protection. On the other hand, the switch has the function of enabling the flow of current to the load. These are the ...
1
vote
2answers
77 views

Why are standalone MOSFETs and transistors preferred over integrated load switches?

As a novice to EE concepts who's trying to apply it to Arduino projects, I was doing hours of research on how to electronically switch another higher current (or voltage) device/component/subsystem on ...
0
votes
1answer
29 views

Deviation in the switch current in a flyback converter

This is the current waveform of the switch and the Vds of the MOSFET. Ideally, the current should fall off in a normal fashion with the switch turns off. Here, the current fall stops and becomes flat ...
-2
votes
1answer
249 views

Simple BiPAP Controller: low-pressure + high-flow, finding components: solenoid-valve, pressure-switch, ¿d.i.y.?

First off, I'd like to thank Spehro Pefhany for provide the the UK guidelines for Rapidly Manufactured VentilatorSystem. Also, I'd like to apologize for my initial disorganized post; it's taken a fair ...
2
votes
1answer
168 views

What might be inside my speaker switch?

I have a speaker switch which has been in continuous use since some time in the 1980s. It a QED SSU4. To my surprise, there are plenty of pictures on the net and even some for sale. Even more ...
2
votes
2answers
1k views

What type of switch would disconnect 3 separate lines?

What type of switch would disconnect 3 separate lines? I just can't think of what it should be named. If possible a suggestion of a specific item would be welcome.
1
vote
4answers
124 views

Is it practical to make home-made membrane switches in low quantities?

I'd like to custom-make membrane keyboard switches as a replacement for the cheap push buttons I am currently using. You have all seen these kinds of buttons. If you have experience making these ...
0
votes
2answers
59 views

NPN transistor switch with load at emitter pin

I found a schematic with a 55 timer driving two transistors, each of which switches an LED (see below). When the 555 output is low, LED1 is OFF and LED2 is ON. When the 555 output is high, LED1 is ON ...
0
votes
0answers
40 views

Remote LED to warn me when a relay in my hot water supply is activated; all wirelessly

I have installed two electric water heaters in series; the new one is only being used as a preheater that only comes on automatically when my solar panels are producing more than my consumption. All ...
0
votes
0answers
36 views

Testing of Earth/Ground produces unexpected results

I am running into an electrical issue in a new apartment. While testing if the earthing is proper or not, when the electrician tried to light a bulb by connecting its terminals to LIVE & EARTH, it ...
0
votes
1answer
53 views

I'm fixing my Nintendo Switch

My Nintendo Switch suddenly wouldn't turn on or charge. Nothing on the screen, no reboot/reset trick I have tried worked. I often used a normal USB-C instead of the official charger, which might have ...
1
vote
1answer
283 views

Arduino and car's 12V switch

I'm trying to control my headlights with my Arduino and a LDR. For this I will use the Arduino as a middle man between the lights switch and the actual lights. The switch has three positions OFF / ...
1
vote
1answer
123 views

What are the momentary switches in Dangerous Music Source?

I have a Dangerous Music Source. One of the momentary push buttons started to fail (I have to push it so hard to work that I'm afraid of breaking something else... I tried to re-solder it, but it ...
1
vote
3answers
4k views

RMS switch current in boost converter

I'm struck in calculating the I(switch,rms) in boost converter. Average current through diode = average o/p current , also average current through the inductor = average current through the source. ...
0
votes
0answers
23 views

MOSFET triode small-signal modeling

TL;DR: Why do seemingly all treatments of MOSFET small-signal operation ignore the nonzero \$g_m\$ contribution in triode? Is the implicit assumption here that if the MOSFET is operated in triode then ...
0
votes
1answer
28 views

Connecting more than one input of IC together

I'm interested in using SLG7NT402V Load Switch and I was wondering if it's okay to connect pins 3,4 together and 6,5 together. what is the difference between this and using only one pin? does this ...
0
votes
2answers
281 views

Convert a hall-effect flow meter to operate as on-off switch

I'd like to convert a hall-effect flow meter to operate as on-off switch. the output is in pulses, which arrive at a rate proportional to the flow rate. what I would like to do is have a circuit ...
-1
votes
1answer
62 views

Switch lamp problem [closed]

I have the answer to the following problem, but I am not sure how they got it. Please explain: Four identical incandescent light bulbs L1, L2, L3, L4, and a battery are connected as shown on the ...
0
votes
1answer
84 views

How to turn on and off with certain frequency (for example 20 Hz) a simple circuit?

I'm trying to connect a battery of 9 V to the secondary coil in a transformer (220 V - 12 V), but I would like to turn on and of this connection with certain frequency in order to see in a ...
1
vote
1answer
41 views

Touch switch for hanging lamp (touching metal bar): Ideas?

A few years ago, we have bought an IKEA Glimt hanging lamp that operates with halogen lamps. It has a "touch dim" functionality, so when a person touches the metal bar of the lamp, it dims (...
0
votes
2answers
82 views

Did I understand this diagram correctly? How do you put a load on a positive wire?

Sorry I mixed up the two diagrams, I thought both diagrams were using FETs on the right side. I am trying to turn on a 5V separate power source with a 3.3V GPIO output. I have two separate circuits, ...
1
vote
2answers
211 views

How to use Arduino to control the switch on a 4.5v circuit

I've been building a wall mounted lightsaber using the below board. At the moment the switch is turning it on and off, however I want to automate this with an Arduino. Can I use a digital output ...
0
votes
4answers
55 views

Single pole triple throw analog passthrough

I have a circuit that will simulate a device. The device in question normally communicates by adding/removing resistance from a generated signal, the source of the signal will then measure the voltage ...
0
votes
1answer
53 views

How to control the output current in when using a transistor as a switch?

Assuming that I have the following circuit where I use a transistor as a switch: When the transistor is not active Vout will be equal to the Vcc and the current will become very high right? So if I ...
1
vote
1answer
62 views

An OR power supply circuit

consider the following circuit: This image shows a simple "diode OR" power supply switch. I am trying to derive the cheapest circuit to obtain this functionality (the given circuit does not ...
0
votes
3answers
193 views

How to build a small LED assembly?

I'm building a custom model of the AT-ST from The Mandalorian: I have the model almost done and I thought it would be really cool to add actual lighting to it. The model is about 6" (16cm) tall, but ...
0
votes
0answers
12 views

Kitchen vent damper in condo [migrated]

Forgive me - first timer here, but I'm striking out on Google searches. I live in a condo with central venting for the bathrooms & kitchen. The microwave is installed above the stove and hooks ...
0
votes
2answers
39 views

Maybe a JK latch? Need some help

complete electronics novice here unfortunately. Please bear with me. I'm after some kind of switch (latch/flip-flop?) that will interrupt a momentary switch held in its 'on' position when another ...
0
votes
3answers
287 views

Where are all the multiplexers?

I am trying to implement a circuit where 2 SPI drives (basically two masters) speak to 1 slave. Both operate on a 3 wire SPI. Keeping that in mind I was going to have the CLK and MOSI of both as ...
1
vote
5answers
111 views

Use momentary switch to switch between three devices

I need a solution to use one momentary switch to switch between modes on a pump. Off (NC) | Low | High. What I mean is you push the pushbutton once to turns pump on low, push it again for high and ...
1
vote
1answer
137 views

Using capacitive touch switch as guitar pick-up selector

I want to use two Schurter 3-101-401 one for each pick up. I was able to get them wired up but the signal for the pick-ups comes out no matter what. Here is the info https://www.mouser.com/...
0
votes
1answer
180 views

Bypass Gate-to-trigger-converter via switching jack

Goal I like to trigger a LF398 Sample-and-Hold IC via a 3.5mm Jack (modular synthesizer). The desired behaviour would be: if a cable is plugged in, incoming signals will be converted to short ...
0
votes
3answers
68 views

NL17SZ74 D-Flip Flop circuit doesn't work!

I've been having trouble with what should be a really simple Momentary-to-Latch D flip flop switch circuit. Basically: I want the momentary switch PUSH to set the CP (Clock Pulse) Pin Low and on ...
0
votes
2answers
269 views

Add tilt switch to this photodiode circuit

I'd like to take this phototransistor switch circuit: And add a tilt-ball or similar switch in series. That switch needs to be heavily debounced, so that it stays "switched" more or less for several ...
0
votes
0answers
37 views

Driving an array of resistive loads on high side with as little parts as possible

I'm trying to switch an array of resistive loads at 12V as fast as possible using least amount of parts due to limited board space. I have tried to find sourcing darlington transistor pairs but they ...
0
votes
1answer
2k views

RGB LED strip presets controlled by a switch via 2-pin connector

First, I apologize if my terminology is incorrect. I am out of my element, but trying to figure this out. I bought a cheap PC case in Korea, and it included an RGB LED strip on the front of the case ...
0
votes
0answers
37 views

Help identify waterproof tactile button cap

I’ve been searching for a special kind of tactile button cap that mounts to a panel and effectively makes it splash-proof, while still allowing the button beneath to be used. I’ve seen it on ...
5
votes
1answer
214 views

Switch between 2 power supply feeds without device losing power

I have done a search on here but didn't find the answer (maybe "woods for the trees") but here goes... A brief 'background' -- In my house, there's a switch by my front door that turns on/off the ...
0
votes
1answer
44 views

Primary Battery and DC Power Switch

I have designed the below circuit to automatically switch between a primary cell (3v) battery, and if available, an external DC power supply (~3.3v). Since the cell is a primary cell, it needs to be ...
0
votes
1answer
28 views

Switching 2 momentary outputs sequentially with one momentary input… how?

so I have two buttons I need to trigger momentarily with a relay for each, the triggering needs to be done with a foot pedal that has a NO and a NC state with each press of the pedal it needs to ...
0
votes
2answers
119 views

Identify live or neutral in 2-way switch

I have a 2-way switch connecting to a light and it works properly. When opening it up, it has 3 inputs with the same wire color. I don't know the setup and I wish to know if there is a neutral in one ...
0
votes
1answer
61 views

Momentary switch 12 V motor reverses game

I am trying to figure out how to control a dc motor with a momentary switch as a trigger and limit switches for stops. The trigger needs to be momentary because I need three of them in parallel at ...
0
votes
2answers
66 views

Should I wire my CNC limit switches as NC or NO?

I built a CNC router about a year back and have had intermittent limit switch triggering for a good while. After doing everything I could to remove any EM interference from the system (run the signals ...
0
votes
6answers
233 views

What is the spark, caused by opening/closing a circuit, dependent on?

I have a DC circuit that runs 1 A current in it when it is closed. When I close the circuit, i notice that there is a spark between the terminals of connection when they're brought close enough, just ...
1
vote
3answers
76 views

LED Toggle switch for ground

I am in the process of doing some wiring on my car. Part of this is adding in a switch panel in. For this I have 4 LED Missile Toggle switch's. At the moment I use one for some additional lights, this ...
3
votes
4answers
736 views

Always-on socket in-between a 2-way switch?

I have access to a power cable that powers devices through a 2-way switch, basically: Is it possible to add an always-on socket in between using L1, ...

1
2 3 4 5
56