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.

3
votes
0answers
37 views

Timer activated by Reed on AC solenoid

Let me start by saying thank you for taking the time to read this - I really appreciate it! To the point: I am trying to create a 2-digit timer that resets and then starts at the activation of an ...
2
votes
0answers
709 views

Tactile switch actuator extension methods?

I am not a 100% sure this is the right place to ask this, but I couldn't figure out another, more appropriate community. I am designing a PCB for a product, which will have a tactile switch. The PCB ...
1
vote
0answers
70 views

How to isolate a RLC circuit with MOSFET switches?

I'd like to isolate, with high-side and low-side switches, a RLC circuit after the inductor has been energized with a current of 2-3A from a 12V source (see sketch). When the RLC circuit is isolated ...
1
vote
0answers
17 views

Hook up an automatic transfer switch with two phases only

We have a house in Haiti connected to the shore line. The shore line isn't always working so we bought a generator. I wanted to ground one of the two phases to create one neutral, one phase and a ...
1
vote
0answers
43 views

LEDs driven by GameBoy sound

My circuit does not work as I thought it should and I'm really confused now. What I want? Two LEDs which will pulse to audio LEFT and RIGHT channel separately. And same for display BACKLIGHT, but ...
1
vote
0answers
58 views

Problem with signal edge in schematics containing high speed IC switch

I am trying to design the following schematics: There are two kOhms resistance which are connected serially. One is load and another is device resistance. I need to apply the voltage in a the ...
1
vote
0answers
135 views

What's inside a reed switch that cannot be tested with a multimeter?

I'm shopping for reed contacts that are rated for 230V AC, because I don't want to use an always-on power supply just for a relay and a reed switch. This is surprisingly difficult, but I found this ...
1
vote
0answers
50 views

Circuit Design: Momentary switch long press ON, short press OFF

I'm trying to create an accessory controller for my 2001 BMW motorcycle. To those who aren't familiar with the older BMWs, there is a separate "turn signal cancel switch" on the handle bars that when ...
1
vote
0answers
26 views

Voltage controlled switch simulation

I'm trying to short two pins on a chip when an audio signal is received and float them otherwise (same effect as a tactile switch). I thought the best way would be to use a voltage peak holder and a ...
1
vote
0answers
70 views

How to get NodeMCU to detect an external switch closure of an unknown voltage?

I'm getting really into home automation as a side project of mine and one of the next things I would love to automate is my doorbell. Short question: If I have a switch (momentary button in the form ...
1
vote
0answers
187 views

Mosfet as a Power Selector Switch - Value of a Resistor & Other Clarifications

I'd like to breadboard a simple circuit which implements a mosfet pair to emulate a mechanical SPDT switch. The circuit schematics can be found here. The circuit looks identical to one that can also ...
1
vote
0answers
264 views

mosfet n-channel high side switching considerations

I know high side switching is normally done with a pchan mosfet but i don't want have to invert my control signal. So i am curious if i want to source 10mA through the 28V rail on a n channel mosfet ...
1
vote
0answers
63 views

Help in identifying two parts

I need to identify two parts that I need to replace, but I'm having a hard time doing it. These are the parts: Part 1: From my research I think it is a trigger switch (http://www.jiaben.com/en/pro....
1
vote
0answers
29 views

design of a startup switch

I have made the regulated charge pump of -6V and it will be connected to the PWELL region only. But for the startup case, when we power on the chip we want the charge pump should be 0. I want a ...
1
vote
0answers
496 views

Replacement for a P-Channel Depletion MOSFET

I've read some of the questions about P-Channel Depletion MOSFETS and I understand their availability is very limited and often expensive. So what I'm hoping to discover with those that view and ...
1
vote
0answers
110 views

Proper SPDT switch wiring

Apologies in advance if this has been asked before, but I haven't been able to find anything like it. Please let me know if it has. I'm curious about the proper/standard way to connect a SPDT switch ...
1
vote
0answers
110 views

Using NPN transistors as switches for low-current, 3VDC infrared transmitter device

I'm currently trying to hack up an IR remote for electric holiday candles so that I can use Amazon Alexa or Google Home to turn them on or off. To do so, I need to trigger the switches on the hand-...
1
vote
0answers
315 views

Can we use 125VAC 20A switch in place of 12VDC 20A switch?

Can we use 125VAC 20A switch in place of 12VDC 20A switch? I have searched my local market and found 125VAC 20A switch. Can i use this AC switch in place of 12V 20A switch as it is not available in ...
1
vote
0answers
545 views

changeover normally closed to normally open

I have a switch that is used for setting tool lengths on CNC Mill. The switch operates normally closed, and breaks the signal when a tool touches it, which sets the length via a macro. The control ...
1
vote
0answers
88 views

Analogue multiplexer using JFET for small signals

I'm working on a circuit with a non-inverting amp and I would like to switch between two reference voltages, both with low output impedance. So in effect i want something like this: simulate this ...
1
vote
0answers
101 views

Using a MCP23017 for detecting open door/window

I'm not a hardware guy. My plan is to read input states using an MCP23017 connected to a Raspberry PI. My doubt is about the switching circuit. My plan is to use Ethernet cable pairs to wire the ...
1
vote
0answers
81 views

Automatically connecting LiPo batteries in series (for charging)

I have a battery charger capable of balance charging up to 10 cells in series (10S), but most of the batteries I use are somewhere between 1 and 4 cells. I have plenty of experience charging the ...
1
vote
0answers
185 views

Switch CB Radio mic with SPST button

I'm a beginner with this type of electronics, but want to try this. I have a CB radio with a 6-pin mic/controller. The pinout looks like this: There is a DPDT switch in the mic that switches ...
1
vote
0answers
71 views

Current across high speed mechanical switch contact even if it can’t be measured?

If I am cycling a mechanical switch at a frequency higher than the bandwidth of a current amplifier and biased using a DC source, is current actually flowing across the contact? The following ...
1
vote
0answers
106 views

test 0.5A inductive load through switch circuit

We are a switch component manufacturer and typically run life cycle tests with resistive loads through our switch circuits. Can someone recommend a circuit diagram set up to test an inductive load ...
1
vote
0answers
83 views

FET Default on, Turn off with Optocoupler

I am relatively new to electronics and having trouble designing a circuit for a redundant power supply, which I would like to switch to battery if the voltage regulator turns off. This will be ...
1
vote
0answers
124 views

Latching and Momentary Combo Switch

I am looking to recreate a switch circuit I have seen on an intercom system. The switch allowed for two functions, while using one momentary switch. When the switch was pressed and emetily released, ...
1
vote
0answers
73 views

P-Ch high side switch output drop?

I am making a cutoff switch for a SLA battery using the this circuit V2 is the SLA battery, V5 is 0V or 5V coming from a some other logic circuitry. The simulation comes out fine. I understand that ...
1
vote
0answers
92 views

momentary push switch triggering twice

I have a momentary push switch connected to my mbed microcontroller. The switch is used to trigger an interrupt which changes a setting on the device. At the moment the button works around 70% of ...
1
vote
0answers
112 views

Optimal power supply for RF switch

I am planning to use an RF switch to pulse a signal >1GHz. Specifically, I'm interested in the ZASWA-2-50DR switch from Minicircuits (http://194.75.38.69/pdfs/ZASWA-2-50DR+.pdf) due to the low rise ...
1
vote
0answers
166 views

Modifying a N64 controller to connect to a switch

I am trying to make a game, and I need to turn my N64 controller on and off from a micro controller (STM32F4). My microcontroller has an output pin that outputs approximately 5V, for testing reasons I ...
1
vote
0answers
234 views

Low-noise SPDT switch

I need to produce an extremely low noise SPDT switch. This switch will take two different inputs to a single 16 bit ADC. The inputs are 50 ohm BNC outputs from trans-impedance amplifiers. The ...
1
vote
0answers
922 views

Convert a NO push button into an On/Off button

I'm building a boombox, and it needs a couple of switches for main on/off, voltmeter on/off and LED lights on/off. Since I don't have any metalworking tools I am going to buy a premade front panel, ...
1
vote
0answers
106 views

MOSFET Behavior During Pulsed Operation

I am trying to use back-to-back MOSFETs/IGBTs to isolate my pulsed supply from my load. In theory, I will switch on the MOSFETs, and the pulsed supply will be attached directly to the load (but not on ...
1
vote
0answers
126 views

Switching cold cathode fluorescent lights on and off without relay?

I have a few sets of 2-in-1 CCFLs that are designed to be powered off the 12V rail of a computer PSU. I'm planning to build a large 7-seg display using them so I'd like to be able to switch them on ...
1
vote
0answers
201 views

How can I trigger an LED with ultrasound

CASE: I would like to trigger a few independent LED's wireless-ly as cheap as physically possible. It is simply a LED connected to a battery. (The LED-part must be cheap, the transmitter does not ...
1
vote
0answers
287 views

Control DC circuit with an AC lock switch

I am currently adding circuit with a horn and some lights powered by a motorcycle battery. The circuit should be using about 12v 18A. What I want to do is control the circuit with a lock switch. I've ...
0
votes
0answers
18 views

Change Direction of 12v DC Motor Rotation using Relay with stop function

I want to make a circuit to change 12 Volt DC Motor direction, similar to this question: "Change Direction of 12v DC Motor Rotation using Relay", but with the addition that it should stop at each ...
0
votes
0answers
31 views

P-Channel MOSFET not behaving as expected

I bought some IRFD9024 p-channel MOSFETs, and for some reason there seems to be a diode drop from the SOURCE to the DRAIN. As far as I understood it, the body diode is from the DRAIN to the SOURCE as ...
0
votes
0answers
36 views

On/Off Rocker With Separate Momentary Rocker

I hope I'm in the right place for this question, I've completely exhausted all options using Google to search for a solution which I'm sure will be a simple one. I'm working with a 12 V flashing ...
0
votes
0answers
18 views

Digital SPST 74HC4066 and Reed Relays

I'm reaching out today to ask for help regarding SPST switches as compared to Reed Relays. To control a series of signal lines that come from a sensor (from which I unfortunately do not have much ...
0
votes
0answers
21 views

Typical break time of an input power loss of a DC-DC buck chopper

For my graduation project I am using an LM2596S-ADJ module to power a raspberry pi 3 (power consumption 5V 2A). I want a rough idea of how long it would take to cut off the power to the pi if the ...
0
votes
0answers
34 views

High current low voltage MOSFET help

I am wondering if I have a 75 amp @7.4v source, obviously it's gonna be hard to find a switch with a 12 mm thread to handle that power, so I would obviously need some kind of MOSFET. My question is, ...
0
votes
0answers
29 views

Is there any way to reduce negative voltage below -3V when the switch FET open?

I got a problem below circuits. When the source of M1(n-channel FET) got a short to gnd, Massive current would flow through the M1. A circuit would recognize the massive current and make M2 switch ...
0
votes
0answers
48 views

A voltage-controlled electronic equivalent of an SPST switch using MOS/BJT/Diodes

In order to use a close equivalent to ideal SPST switch for basic circuit simulations, I had been using a four-terminal voltage-controlled switch available in Ltspice simulator with quite less rise ...
0
votes
0answers
24 views

Sonoff Touch Wall Switch Electric Connections

SONOFF Touch WiFi Wireless Remote Control Wall Timing Switch https://www.gearbest.com/access-control/pp_1588267.html?wid=1433363 I have the above switch and it comes with three connectors behind (...
0
votes
0answers
30 views

How to swap row/column index in switch matrix ? HC595/HC165 shift registers

I'm having some issue with an Arduino code to interface a 12x12 switch matrix and 12x12 LED matrix. The 12x12 LED matrix is an array of WS28xx and the switch matrix is a combination of HC595 / HC165 ...
0
votes
0answers
39 views

RF switching matrix for DOA

Interested to design an RF Switching Matrix driving a <6Ghz signal from 5 antennas to 2 RX Channels, of the following structure: The possible inputs into the receiver should be: Considering to ...
0
votes
0answers
28 views

Best Hardware Approach to Play With multiple Buttons, Switches, steppers, Servos on Arduino

I would like to control the movements and positions of different actuators (steppers, DC motors, servos...), by either controlling some with potentiometers and / or getting them to move to preset ...
0
votes
0answers
33 views

Using internal pulldown to pull esp8266 logic pin low

I'm trying to design a linear actuator with limit switches that both deactivate the motor drive and also signal my micro-controller that the switch is active. I plan on using a DRV8871 motor ...