Questions tagged [switches]

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

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11 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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45 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??
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28 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
27 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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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
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 ...
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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 ...
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35 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 ...
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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 ...
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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 ...
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22 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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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 ...
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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
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 (...
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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 ...
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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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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
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 ...
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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 ...
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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
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 ...
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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 ...
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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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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 ...
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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 ...
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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 ...
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2answers
118 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 ...
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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 ...
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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 ...
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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, ...
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37 views

Hold-On-Hold-Off Soft Latch Power Switch Circuit

I'm trying to make a "hold-on-hold-off" type soft latch switch circuit, but I'm having a little trouble. I've found tons of "press-on-hold-off" types, but I haven't been able to ...
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1answer
49 views

One of the two brown wires to my shower isolator switch is not live. What has caused this please? [closed]

My electric shower stopped working. The shower power button didn’t turn on the shower. I then checked the isolator switch on the ceiling. Its red light didn’t turn on when the switch was on. I checked ...
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1answer
43 views

Does this require a larger series resistor?

I am connecting a switch to an input pin on a Nexys A7-100T FPGA development board, like shown in the below image: The circuit has a 10K pull down resistor (R1 on drawing above) to ground and the ...
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1answer
43 views

Connecting USB shielding of two hosts and one peripheral

I'm making a simple project regarding switching USB connection between two computers. I would like to know if it is safe to connect USB shielding for pc1, pc2 and peripheral together, while keeping ...
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2answers
52 views

reversing DC polarity after each use

My touch faucet died. I can use a z44n mosfet to activate the solenoid with the 6V battery pack but I need to have the polarity switched each use to drive the solenoid in the opposite direction with ...
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0answers
31 views

Relay: wetting contacts before using sub-wetting current

I'm considering using small signal relay for my application since I need to switch shunt resistors to measure currents from 1uA to 10mA (two shunts) with voltages from 0V to 5V. Now, it's clear for me ...
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1answer
36 views

Circut to turn on a battery powered electric fence

I want to be able to have a battery powered electric fence automatically turn on in the morning when it's day light, and power off when it gets dark. I don't seem to be able to find a product that ...
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3answers
80 views

How Do These Kind of Power Switches/Systems Work?

Just about all power switches in DIY electronic projects, such as Arduino, simply cut off the power source immediately when you turn it off. However, there are devices like 3D printers that when you ...
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48 views

Did I use Diodes and the Relays correctly in my Circuit Design?

I'm a beginner and recently started a project where I build my own portable bluetooth speakers. I already have a rough layout of the whole thing. I basically want to power a 2x50 Watt Amplifier with ...
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3answers
62 views

Does anyone know of a way to control two sets of switches at once?

I would like to control the two switches in the picture at the same time. So for example when the left switch is in position 1 the second switch is also in position 1. Is a 2-pole rotary switch what I'...
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1answer
68 views

What's the purpose of the resistors and capacitors in this latching push button circuit?

I am trying to design a push button that turns my device on upon a single press and turns it off upon holding the push button for a few seconds. I found this circuit: Aside from the 10uF capacitor ...
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2answers
63 views

A switch that activates a horn when power is cut

I am running a wire around the perimeter of my field for approximately 1/4 mile. The wire is not going to be energized but could be. I want to have a horn set up that will blast when the wire is cut. ...
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1answer
51 views

Blocking current from Backup battery (3x1.5V=4.5V) when powerbank (5V) is turned on my timer switch [duplicate]

I'd like to power cycle a RaspberryPi0 each 1h. I plan to use a TPl5110 for this, which can be powered by around 2.5-5.5V. I want to deliver 5V to the Vdd-Pin using a powerbank. However, once the RPI0 ...
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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 ...
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1answer
45 views

using Schmitt trigger to debounce a switch [closed]

How can a Schmitt trigger be used to debounce a switch? please try to explain it with pictures as well.
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2answers
91 views

How to fix my simple MOSFET power switching circuit?

In my design the goal is to create a simple switch between power sources using a MOSFET. J2 is just a connector for the main power source which remains connected VDD is connected to a USB port VREG ...
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2answers
123 views

Controlling two devices with the same push button

Currently, I have a push button (SW) controlling a device (DEV1). What I would like is to another device with the same push button (SW). I measured the voltage on DEV1's and DEV2's push button inputs, ...
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1answer
79 views

Read 12V input with Arduino/Teensy via PC817 (Optocoupler)

I have a SPST rocker switch with 3 terminals (Datasheet), which contains a dependent LED which is illuminated via 12V if the switch is on. I want to read the switch with an Teensy/Arduino. After some ...
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3answers
347 views

LED lights if two or more switches are on at same time [closed]

I have a need to know if two or more of eight switches are on at the same time. The supply voltage is 12 volts dc. The switches are SPST. I have looked at digital circuits but have yet to figure it ...
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1answer
51 views

Bidirectional voltage and current switch using mosfets

I'm following this tutorial (spanish) which tries to create a bidirectional power switch usng mosfets based on this publication by texas instruments The concept of the circuit looks simple enougth to ...

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