Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [switches]

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

0
votes
1answer
100 views

MOSFET as a switch: One or two FETs?

I was wondering if there is a difference between the following switch circuits: I simulated these here and here and they both seem to have the same behavior. The one with two FETs was suggested in ...
0
votes
1answer
56 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
54 views

Conditional electric switch based on two power sources

Is there any available electric switch in the market for which the following condition satisfies? It has two power sources, src1 and ...
1
vote
2answers
55 views

How are manually and electromechanically actuatable switches called?

I'm looking for (the name of) a part that is basically a bistable relay that has a mechanical interface as well, but I don't know how to look for it. I have seen a simpler but similar part in a ...
0
votes
1answer
34 views

Configurable Switchs Selector Identification

Probably off topic. I need help identifying a switch type. The switch in the picture is embed in a camera to define configurations to the hardware. I would like to use this kind of switch in a ...
0
votes
1answer
54 views

Convert dB to resistance

I am new to this, but I wanted to ask how it would be possible to convert a dB value into resistance. I've been looking at an isolated analog switch from http://www.ti.com/lit/ds/symlink/ts5a3359.pdf ...
0
votes
1answer
120 views

Two BJT as Switch for 24V problem with LED always on

Circuit This is the simulation on Falstad that works: Where it is being done that way for tests purposes, but the objective is to use a TTL signal from the encoder to send a 24V signal to a PLC or ...
0
votes
1answer
90 views

Mosfet battery switch

I am trying to power a Rpi project with a battery. Most of it is working fine but I would like to have a switch that allows me to disconnect the Pi from the battery because even when shutdown it draws ...
0
votes
1answer
98 views

220 VAC/110 VAC to 24 VDC

I'm trying to understand how to build a battery charger. I need to convert from the usually european 220 VAC to 24 VDC but also from USA 110 VAC to 24 VDC like the normal chargers, to adapt it to the ...
0
votes
1answer
58 views

Help with circuit to alternate a light switch with solid state

I have designed a PCB that allows me to turn a light on with a mechanical relay. The difference between your average implementation here is that I also wired the board up to a wall light switch which ...
0
votes
0answers
502 views

How to model MOSFET as a switch on LTSpice

I am trying to use MOSFET as a switch on my circuit. I hope someone can help me model it!
0
votes
1answer
48 views

Efficiency of power converters [closed]

Why is the efficiency of rectifers not 100% even when ideal switches are used for its modelling? In conducting state, the voltage across switches is 0, and during blocking state, the current is 0. So ...
0
votes
1answer
51 views

Replacing a switch matrix with diodes with a Analog Crosspoint 8x8 Switch

I have an old piece of a equipment (A Casio MT65 keyboard) which uses a matrix of switches with diodes in series with every switch. Similar to this: http://www.learn-c.com/diodematrix.gif I wanted ...
0
votes
1answer
40 views

Control multiple LEDs with switches on the same circuit

I've searched and searched for this but I can't find an answer and when I find something that looks like an answer I don't understand it. I'm very, very new to this, I can basically pick the correct ...
2
votes
2answers
105 views

I need help identifying a component and how to check if itd faulty [closed]

I have a power supply that only works when the room is very warm. I narrowed it down to one green component with a 15 on top by heating and cooling. When this component is heated the psu works and ...
0
votes
3answers
185 views

Which microcontroller and transistors can I use to control these switches?

I have a SATA HDD case (product details) with switches that toggle the power supply for each HDD. My aim is to control each switch individually via software. (My background: I'm a total novice to ...
0
votes
0answers
35 views

Efficient battery charger cutoff circuitry

I've been designing a battery charger circuit for a while. I couldn't decide how to shut down the current flowing through battery. Actually, a simple output diode helps a lot but they make ~0.5V drop ...
2
votes
1answer
68 views

Where to put the switch on a power supply? 5V/12V or 230V?

An arcade videogame power supply supplies +5V, +12V and -5V (see JAMMA). They usually don't have a switch. If I were to put a switch on such a power supply, what are the (dis)advantages of ...
0
votes
1answer
67 views

Digital switch for 2000V capacitor [closed]

I want to produce a discharge of a capacitor against a test cell, as part of a study on high energy states of materials. I'm using a standard microwave oven transformer as the power supply that I ...
3
votes
1answer
105 views

MOSFET mechanism of failure: was it the heat?

I am debugging a failed MOSFET (IRF6662), and in the process of doing so, am having difficulty understanding fully the thermal behaviour of the FETs. Two FETs used for DC switching both failed short ...
0
votes
1answer
29 views

Help on reading switch datasheet

I am looking to buy a switch for 85Vdc and 16A. https://www.alliedelec.com/m/d/dbd1a0ffce5b4bc03b21347df857ba1b.pdf I was looking at this datasheet and it appears to be ok for 20A @ 125Vdc. Can ...
-1
votes
1answer
53 views

Simple switch to control power

I've been search for days for the right answer to this question but have drawn blanks so far so thought i would ask it here. I'm trying to create a simple circuit to control power to a device. The ...
1
vote
1answer
77 views

Advice on choosing PCB for a 16A, 85V switch circuit

I am making a circuit that will allow a load to be configured in this manner: Load is ON/OFF. If OFF (controlled by a low-side FET making the circuit OPEN), the high side and low side can be ...
0
votes
1answer
65 views

Voltage across the IC

I need to switch three different supply and for that I am planning to use 3:1 Analog switch something as shown in the below Block diagram. As we know there will an on resistance(Ron) for these kind ...
0
votes
1answer
116 views

Connect 3 circuits to one switch

I am building some electronic circuits with some arduino in it to animate LED-strip. The device is powered by 3 USB cables, because as I am using 270 RGB LEDs I can have 5A running trough the cables,...
1
vote
3answers
102 views

How can I have one LED go on, when another goes off

I have a scenario where when one switched electrical path for example a tail light (LED #2) on a motorcycle is switched off, I want LED #1 to go on. When power is switched on to LED #2, then ground ...
1
vote
3answers
282 views

Arduino high side driver with up to 30V

I am experimenting with the circuit for an Arduino high side driver from Nick Gammon: I need the circuit to work with a voltage range from 22V up to 30V and ideally stay cold. Everything else is fine,...
0
votes
1answer
53 views

Using 1 momentary switch to toggle between two latched states. Plus relay question

I know there are many ways to do this, but I'm looking for the easiest setup, not necessarily the cheapest. I need to build a circuit in which a momentary switch alternates power between two 110v ...
1
vote
1answer
96 views

Switching analog and digital inputs to uP

I have a microcontroller, which requires that no signals are connected to its input ports during startup. There is a control signal SYS_RESET, that should first rise, before any input is connected to ...
0
votes
0answers
61 views

debouncing and external interrupt

an AC motor turns untill activating a limit switch connected to Arduino Uno pin 3 (INT1) configured as INPUT_PULLUP... the motor is stopped in the INT1 ISR, and after a long period (>1 hour) the ...
1
vote
5answers
269 views

Transistor toggle by NPN and PNP - how is it build?

I want to toggle between 2 devices using one GPIO 3.3v pin and powering them with 5v. I thought about using an NPN and PNP transistor, tying up the base and collector/emitter to 5v power supply. If ...
2
votes
2answers
97 views

What's the name of the type of button that you have to press and hold for current to pass through it?

I want to build a LED toy gun that lights up when the trigger is pressed. I need a button or switch that only allows current to pass through it only when the button is pressed and held down. What is ...
-1
votes
2answers
73 views

It is rated to 20A @ 28VDC, but I was wondering with a reduced current (16A), it can withstand a higher voltage [duplicate]

Goal: I am looking to buy a switch that handles 16A @ 85VDC. This switch needs to be a SP3T switch so I am not sure a relay can do this. The switch will move between a PU/PD/and load and is a LS ...
0
votes
1answer
19 views

agilent 34903 Actuator/Relay card not working in remote mode

I have a simple SPDT relay on the 34903A card, hooked into a 34972A DAQ Unit. The COM is a 5V supply from an external source,and I have the NO pin hooked up to an input externally as well. When ...
0
votes
2answers
150 views

3 pins digital switch component for an Arduino project

I am trying to use a digital switch component to switch on/off SCL lines of some I2C sensors. On proteus, I can perfectly simulate that with a component name DSWITCH as shown on the attached picture. ...
0
votes
0answers
22 views

What kind of switch (SP4T) is ok for short periods (100-200us) of 85V, 16A?

I am looking for a switch that is a SP3T switch that can handle 85VDC and 16A. The 85V, 16A reqiurement is only for short periods of time (100-200us). The switch I need to use will connect a PU, PD, ...
0
votes
2answers
306 views

Potentiometer with SPST Switch Wiring With Bypass

I'm stumped on wiring a 10K Ohm audio control potentiometer with spst switch into a LM386 amplifier circuit. The pot I'm using is very similar to the one in this link: https://www.radioshack.com/...
0
votes
1answer
57 views

Tactile switches

I am trying to figure out how to remove a tactile switch and replace it will a wire to connect to a larger switch farther away from the PCB. I am having trouble determining how I need to wire this. My ...
0
votes
1answer
46 views

Floating Nwell schematic and introduction in a MOS switch

My classmate told me using a mos (body connect drain)as a switch may have leakage current,because there is a parasitic diode in that MOS,so there will have a leakage current.so i have to connect the ...
0
votes
2answers
93 views

How switch a 3v load high side, from a uC powered from same 3v?

I have a uC (Arduino Mini) powered from 2xAA battery pack. The Mini display some data on a circuit with a MAX7219 + 2x7segments 4 digits led (a total of 8 numbers). Because it is powered from battery ...
0
votes
1answer
44 views

Load voltage and current of relays

https://www.zoro.com/schneider-electric-iec-magnetic-contactor-24v-coil-9a-lc1d093bl/i/G0569497/ Hello guys, I'm very new to relays and practically know nothing about what to look for and how to ...
2
votes
2answers
111 views

Crosstalk in analog switch

Art of Electronics, 3rd Ed, pg. 179, gives a model for the capacitive coupling between independent channels of an AD7510DI analog switch. The authors ask to calculate the coupling between channels ...
1
vote
1answer
181 views

How to use MOSFET for load switch applications

I would like to do something like this application note: http://www.onsemi.com/pub/Collateral/AND9093-D.PDF And I'm using this transistor: https://www.fairchildsemi.com/datasheets/FD/FDS5670.pdf For ...
4
votes
1answer
3k views

SPDT in LTspice

I'm currently new to using LTspice as a circuit simulation software. Right now I'm trying to check if the IC (BD6221F-E2) that I included in the program is working. The process of making this IC is ...
1
vote
1answer
79 views

2 way selection switch for up to 30 kV

I am looking for a mechanical 2 way selection switch which is rated up to 30kV / 10 A (pulsed, pulse length 100 micro-secs). It could be something like mechanical switches (e.g. the polarity switch of ...
0
votes
3answers
127 views

Electronic switch with high number of poles [duplicate]

I have two cables each with 10 pins, that connects between two PCBs. I would like to be able to connect and disconnect them from each other. Something like this link to 10 pole mechanical switch, ...
0
votes
1answer
121 views

Latching power circuit with short-to-ground switch

I'm trying to build a circuit around an existing switch that allows another component to override the switch state. (Our component is a computer and the feature we're trying to build is remote-...
0
votes
0answers
50 views

What kind of switch do I need to emergency stop a dc motor?

I have a DC motor - 48v - 1000w - ~20A and I'm controlling its speed using a PWM. When I plug my 48v battery, the only protection I currently have is my main Mosfet that acts like a switch. If the ...
0
votes
0answers
20 views

Switch comparison (single NMOS VS series NMOS VS TG switch )

The TG(transmission gate) switch is most common switch,however,i use three switch to test the schematic from here:Simulation is the same as my thinking,but different from the pape r(charging loop) ,i ...
0
votes
0answers
19 views

Remote controlled relay with override design

I have designed a circuit to control the mains that works but I'd like to add an override functionality to it and I can think of a few ways to do that but I was wondering if anyone out there had a ...