Questions tagged [switches]

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

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46 views

Is this a 2-way switch or what?

Are there switches realizing these 3 states, or at least the 1st and 2nd?: They could be switching DC or single-phase AC. I am trying to find out if they exist, how they are called and if there are ...
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22 views

How to wire a single input for two separate chargers e-bike

I'm currently designing my own e-moped for university (named ‘enduro 器’); I am currently going through the wiring and I am in need of some assistance. (refer to the image above) I want to be able to ...
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78 views

How to cheaply build a latching relay system to disable a circuit until power is cycled?

This is my first post here. I have an aftermarket backup sensor that needs to be disabled when I back a trailer. I want to be able to push a button to disable it, but have it be automatically re-...
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3answers
136 views

Using op-amp and diode switch to drain capacitors – how to limit current?

I want to use a diode switch to drain a capacitor. The switch in the circuit is opened and closed regularly. The op-amp will flip between ground potential and 5V at its output. When the output is low, ...
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34 views

Programmable momentary switch for motorized desk desk leg with elcetronic stop

We're building motorised tables with 1 leg. Currently the manufacturer can only do either: 2 buttons up and down switch, that need to be pressed to start the motor and pressed again to stop the motor....
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2answers
77 views

Help identifying circuitry diagram

Now first and foremost, I know absolutely nothing about circuitry - joined an computer science chatroom and they couldn't help, I have cross referenced the symbols to the internet to try and ...
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43 views

How to build a MOSFET switch to control a coolbox 12 V 8 A? [closed]

I have a coolbox in the boat and for certain reasons I want to control its power on/off with a relay type device. There are two important objectives: 1) keeping the circuit closed should consume as ...
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2answers
59 views

Can I use an AC rated momentary switch as a PC power button?

I was looking to make a custom button to power my PC (I needed something which was a bit more custom than the traditional push buttons for PCs (it's not important)) and I came across these: https://...
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75 views

How do I select the transistors for this circuit?

I have no background in electrical engineering at all, and only bought my first breadboard this week. I'm still completely new to this and just trying it out. I'm trying do drive an 12V actuator, ...
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34 views

Switch on and off an electronic device within a time range e.g: 8am to 3pm

i am wondering if anyone know how to adjust an electronic device so it can work on a specific timeframe, I have a water pump, I would like to make it work only within a determined time range, for ...
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Timer switch suggestions?

I have a simple security/alarm system I built for my carport after a thief took advantage of me. It simply has a strobe light and an extremely loud siren, using photoelectric sensors. When the sensors ...
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40 views

LED Driver IC to charge batteries

I would like to use the ZXLD1350 LED driver IC to provide constant current to some NiMH batteries to charge them. However the negative terminal of the LEDs go to an inductor instead of ground. My aim ...
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2answers
52 views

Current sensing relay that momentarily closes contact each time state changes

I have a 240V dust collector that I manually switch on and off using a one-button wireless remote. The dust collector is connected to several machines. I'd like to use a current sensing relay to ...
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29 views

Will this MUX work for my application?

I'm having a hard time determining if this mux will work for my application: https://www.mouser.com/datasheet/2/256/MAX14752-MAX14753-1515255.pdf I'm trying to use 2 of these together in a PCB I'm ...
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1answer
59 views

Why does this switch go both to ground AND to the input pin?

Here is a really simple circuit, that I don't quite understand: https://microcontrollerslab.com/wp-content/uploads/2019/03/Push-button-interfacing-with-ESP32.jpg I understand the LED portion. What I ...
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1answer
50 views

Selecting 36V, 12V and 9V from 3 different PSUs

currently i am designing a system in a machine. One of the feature is it can select power supply between 36V (overvoltage), 12V and 9V (under-voltage). Max current would be 300mA @ 12, while 9V which ...
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1answer
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How to have periodical repetition of customized pulse waveform in LT Spice?

I have a customized Pulse pattern and I would like to have it in repetition. Does anyone know how we can establish that in LT spice?
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76 views

I'm having trouble finding an available switch to match a schematic. Is it possible? [closed]

I'm having trouble finding a 4P3T switch for the circuit below, credited to David Mikeska, which I believe to be described as follows in a contact configuration table you'd commonly see on a datasheet....
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47 views

Transistor as a switch from point A to point B

[ Hello, I'm curious how I could replace the momentary switch with a transistor in this scenario. Would I connect the left side of of the button to the collector and pins 2 and 6 to the emitter, then ...
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2answers
94 views

4x4 keyboard matrix - why no pull down resistors?

I found many schematics out there for a 4x4 keyboard/switch matrix, both with and without diodes. Yet I don't get it. If one doesn't add pull-down resistors, rows 1 to 4 will all be floating. Can ...
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1answer
125 views

SATA hard drive selection by mechanical switch

I want to have a toggle switch to toggle between two hard disk drives. Only one should be connected at any given time. The best possible solution for what I want to achieve is to toggle the power ...
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1answer
54 views

Can two On-Off valves be independently or concurrently switched with my hardware?

I am having a ton of fogginess today thinking of a way to switch a couple On-Off valves with the hardware I'd like to use. When I say 'On-Off', I mean the valves pictured below, where applying voltage ...
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1answer
51 views

Terminology for components found in Kitchen Timer

Apologies if this is a duplicate, by definition I'm not sure what to search for. I took apart a kitchen timer and found a few things I'd like to learn about, but couldn't find the right terminology to ...
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1answer
61 views

Problem Implementing high side P channel mosfet power source selector

I have build the above circuit on a breadboard and it is almost working but not quite. I've spent a number of hours on the problem to no avail. My background is not electrical but I've been building ...
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0answers
59 views

Using N channel MOSFET as switch

I have many N-channel MOSFET and i want to know is there a way to use as an alternative of P-channel (Q1) in this circuit? This circuit is responsible of switch between battery and power source.
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3answers
94 views

How To Make A Switch Close When Another Switch Close? [closed]

I want to use a rotary switch to switch between filters which I believe will give me different frequencies. But the problem is when I connect the positive feedback to the other filters too, naturally, ...
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2answers
54 views

Current Dependent Switch

I have a 24v DC circuit; I need a contact that breaks the positive line if the current in the negative line differs from the current in the positive line. So if the negative line has become broken or ...
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1answer
61 views

Can I connect a wall switch to DC?

simulate this circuit – Schematic created using CircuitLab I am making an air blower with a Kingwin RL4B-B1402512H fan. Can I use the wall switch, and if so, can I use the dimmer as well?
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1answer
45 views

nRF52840 with optocoupler and mosfet

I would like to make a switch which will be able to switch on/off 12-60V low current devices using nRF52840, optocoupler and mosfet. I found this schematic and my idea was just to adjust R1 because ...
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1answer
63 views

Reed Switches - Good brand, stuck in the closed position problem

I'm doing a project with an Arduino pro mini 3.3v that uses internal pull-up to detect changes on a reed switch sensor. I'm buying the reed sensors from AliExpress, and most of the time they work OK ...
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0answers
41 views

DC step-up converter, slecting 2 different Vout with SPDT switch

I want to modify a DC-DC step-up converter that uses a single potentiometer that sets the voltage to use a single SPDT switch where I can select the output voltage during operation without turning the ...
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1answer
45 views

How do you control a control wire?

I am reading about electromechanical relays used in the first computers and I am told that the mechanical relay is closed and opened by an electromagnetic field generated by a coil on a control wire ...
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3answers
103 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 ...
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35 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 ...
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1answer
30 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 ...
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2answers
84 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 ...
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2answers
62 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 ...
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1answer
133 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 ...
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26 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 ...
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1answer
38 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 ...
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1answer
64 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 ...
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1answer
43 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 (...
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1answer
85 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 ...
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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, ...
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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 ...
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1answer
65 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 ...
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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 ...
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4answers
57 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 ...
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3answers
72 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 ...
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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 ...

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