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Questions tagged [switches]

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

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664 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 ...
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0answers
57 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 ...
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0answers
134 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 ...
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47 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 ...
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0answers
25 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 ...
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0answers
54 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 ...
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0answers
164 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 ...
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0answers
240 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 ...
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62 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....
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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 ...
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0answers
379 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 ...
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0answers
105 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 ...
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107 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-...
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257 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 ...
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460 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 ...
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0answers
79 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 ...
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0answers
91 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 ...
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0answers
78 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 ...
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0answers
176 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 ...
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69 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 ...
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102 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 ...
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0answers
81 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 ...
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0answers
108 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, ...
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72 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 ...
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0answers
91 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 ...
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0answers
111 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 ...
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0answers
161 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 ...
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223 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 ...
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0answers
874 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, ...
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0answers
102 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 ...
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0answers
122 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 ...
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0answers
200 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 ...
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0answers
286 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 ...
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0answers
19 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 (...
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0answers
20 views

How to Measure Switch State with Current Sensor

I have a motor attached to a relay board with an INA 219 between the board and motor. I would like to engage the relay and turn on the motor, and then flip the motor off when the switch changes state....
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0answers
25 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 ...
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0answers
25 views

Simple implementation of a transistor switch circuit with a given maximum activation frequency

Consider "the transistor switch to control a high-power LED" example at: https://learn.sparkfun.com/tutorials/transistors/applications-i-switches Suppose there is a control circuit that is trying to ...
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0answers
38 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 ...
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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 ...
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0answers
31 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 ...
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0answers
32 views

Touch switch for LED lamp

I would like to see if possible to use a mosfet like the irfz44n to do the job as a touch switch... off-course it will need a few more components, but my drawing has the general idea. the lamp already ...
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0answers
50 views

How to find SPDT IC that doesn't need a power-supply to have NC and COM connected?

I am looking for a SPDT IC (or circuit?) that connects NC and COM even if the power-supply is off. Basically, I need a TS5A3157 without the need of a power-supply in the NC state. The reason for ...
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0answers
34 views

Multiplexer Configuration for Switching Audio Effects Loops

I'm in the middle of designing a guitar pedal that digitally controls the routing of audio between different effects loops using switches. I am having a hard time figuring out what hardware//...
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0answers
36 views

Power distribution for low power application in a tight package for wearable

I'm looking for a component that will allow me to switch on/off the supply power to my onboard peripherals. I have a design that requires the peripherals to be powered only when they are in use to ...
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0answers
35 views

2 Light Sources into one Power Source

So to start I'm uncertain if this will seem like a lot or easier than I'm making it out to be. The premise is that I am making a marquee tattoo parlor sign with a very flashy theme, consisting of a ...
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0answers
206 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!
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0answers
31 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 ...
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0answers
50 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 ...
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0answers
21 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, ...
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0answers
48 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 ...