Questions tagged [switches]

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

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31 views

How should I connect this switch securely?

I have a nifty 22mm pushbutton switch with an RGB LED ring light around it. I would like to securely wire this for an application in an outdoor control panel that may get shaken around a bit, so I'm ...
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1answer
45 views

P-Channel Mosfet switch and Capacitor Discharge on Drain

I'm using the following circuit with a P-channel mosfet to switch the positive line to a transceiver. I want to keep the transceiver grounded and switch it off to stop current draw from the battery. ...
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22 views

pass-through Thunderbolt KVM Switch

I can not find a true pass-through KVM Switch for USB-C (Thunderbolt) to buy. So I am thinking about maybe building one myself. Currently I am just plugging and unplugging the Thunderbolt (USB-C) ...
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1answer
41 views

2 momentary switches to control a pump

I would like to use 2 momentary switches to controle a water pump (start stop). When you press start the pump should run until I press stop or there is a power outage. The pump should also be off when ...
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2answers
60 views

Connecting a light to a battery

my son and I are working through this book called The Thomas Edison Book of Easy and Incredible Experiments. We are stuck on the first experiment where you make a switch to connect a battery to a ...
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2answers
42 views

Charge distribution on switched capacitors

Computing the voltage and charge of these capacitors in series and parallel, I come up with a situation in which I couldn't explain why the circuit is behaving as it is. The circuit is the following: ...
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1answer
37 views

RS232/CAN switch circuit

I am working on a communication switch that is digitally controlled and I am using four MUX506IPWR from TI to choose the output channel. The switch has on the input a DSUB9 for a CAN channel and a ...
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1answer
73 views

Convenient way to reverse push button logic

I'm building a LED flashlight powered by a 3.7v lithium battery that must be ON when I push the button OFF when the button is ...
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2answers
73 views

Bi-directional electronic switch for external circuitry

I am in the process of designing a PCB that is powered by a 10V / 1mA supply from a fandeck (incorporating EC/DC fan motors). One of the functionalities include having continuity between 2 pins on ...
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1answer
18 views

Finding an analog switch IC (BBM & SPDT) for video signal

I'm looking for a SPDT analog switch IC with Break-before-make to switch between video signals. However, the amount of options available leaves me overwhelmed with no clear option in sight. I've ...
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2answers
51 views

Troubleshooting AC motor brake

I am trying to fix a brake on a mitre saw. I am yet unsure of its operating principle. The switch (shown taken apart) has one terminal on the left side with grey wire going to the motor housing, and ...
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1answer
38 views

Commute a 12 V siren with an ESP01

I would like to commute a 12V siren with an ESP01. I thought to use NPN or PNP transistors TO-92 that I have since a long time in my drawers. The ESP01 has 3.3V maximum at the output, and the siren ...
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1answer
63 views

how to let dc only go one way

I'm planning to make a circuit that lets me switch my keyboard and mouse between 2 computers. this shows me how to do it. https://hackaday.com/2016/11/12/diy-kvm-switch-lets-you-use-one-keyboard-and-...
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1answer
34 views

Latching power button with force-off

There's been a lot of soft-latched power switch circuits discussed here and elsewhere on the internet. However, I can't wrap my head around how to implement the following requirements: Battery ...
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1answer
52 views

Wire bypass/override switches in a landing gear circuit

The wiring diagram below is for the Landing gear circuit in a homebuilt airplane using Automation Direct pressure switches. These pressure switches turn the hydraulic pump off when a pre-set pressure ...
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1answer
108 views

Not debouncing on a MIDI keyboard

I am modifying an old 90s keyboard (CTK-450 by CASIO) to make it a MIDI controller. I'm going for an Arduino that goes over the matrix layout of the keyboard. The issue I have is with debouncing. ...
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1answer
40 views

How to connect two inputs to one output for a mains connection

I have a digital switching system in my home that controls the water heaters. One heater is shared between two rooms and I need a connection such that it can be turned on from either room. I'm ...
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1answer
41 views

Understanding Touch Switch with BJTs and Relay

We worked on this circuit today in one of my labs and it had my groupmates and I puzzled. We had a 1k resistor in series with an LED on the NO side of the relay. I searched for the circuit online and ...
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1answer
40 views

Wiring a stove top Infinity switch [closed]

I have a older Frigidaire stove. The infinity switches are completely disconnected. I need to know where the positive, negative and ground wires plug into the switch and also where the stove top ...
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1answer
39 views

Trying to determine the switch type I need to shop for

I am trying to find a double-illuminated 12v rocker or pushbutton switch (one light for off, 2 lights for on, or at least different colors for on/ off), single-throw, on-off, but... The circuit I ...
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1answer
44 views

Change closing transistor to opening in a Microwave Radar Switch?

Preamble: I have little knowledge of electronics in detail, but I know how to solder, have a working brain and am fearless :) There are many low-cost Microwave Radar Switch PCBs out there (very ...
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0answers
54 views

reversing behavior oh NC switch (for dummies)

i'm wondering if i can use a NC switch for courtesy light of my toyota, At the same time as NO switch for a device called "sterring auto tilt" when you enter the key you clik a switch that allow the ...
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0answers
33 views

N Channel Power MOSFET as a Switch

I am trying to use a N-Channel Power MOSFET to turn on a capacitor bank in my MRI birdcage coil. I tried using PIN diodes as a switch but they kept failing as they could not handle 400 V and 9 A that ...
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0answers
41 views

Controlling a Wi-Fi relay switch using a “no-neutral” touch wall switch

I'm planning to install touch wall switches in my apartment. They appear to be powered by leaking current through the switched receiver (e.g. a lightbulb) – no neutral connections. I also wanted to ...
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1answer
42 views

Can the button still work if being far away from Pull-Up Resistor?

Here is the illustration for pull-up resistor, I am wondering if the button still can drain the input voltage to GND when the wire between button to MCU is very long which increases the impedence of ...
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2answers
44 views

Hows does this 12v relay works with transistor voltage drop?

I'm working my way through "Make: Electronics" by Charles Platt and came across the following schematic: As someone who just recently got started with electronics, what I can't wrap my head around is ...
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23 views

Schematics of this mini high pressure switch

Does anyone have any idea of the internal schematics (illustration) of this? It seems they've incorporated a traditional one-port pressure switch and tee into a single casing, right? https://www....
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37 views

Switch to connect/disconnect 7 lanes (maybe 7pdt?? switch)

I'm looking to take a 6s Lipo Battery balance lead (7 pins), and run them to one of two sockets. One with a charge meter, and the other with a charger. I want a switch that will toggle between the ...
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1answer
57 views

Switching buzzer on and off with two transistors

I want to make a simple water level indicator with tank full alarm as shown in the diagram. What I want to achieve is, when the tank is full to 100% and water is still flowing through the inlet pipe (...
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1answer
74 views

Light switch with 3 SPDT switches?

In the below circuit, I have two switches that can turn the light on or off from those two locations. Any 'switch' will turn the lights into the opposite position: How could a circuit be made to ...
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2answers
33 views

Latching Switch Pinout

I'm planning on incorporating a latching switch into my design: https://lcsc.com/product-detail/Electrical-Switches_XKB-Enterprise-XKB8080-Z_C318860.html I also found the corresponding datasheet: ...
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24 views

Three Phase Rectification using by Bi-directional N-MOS Switch

I have been trying to design three phase rectifier using by bi-directional N-Channel Mosfet . However, Non-isolated gate driver is not able to open and close U4, U8 and U12 on image. What kind of gate ...
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1answer
30 views

Looking for a micro slide switch On/Off guard that will work on a vintage RC transmitter

I have a very old New in the Box RC transmitter but some of the plastic items are a bit brittle. Any ideas?
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1answer
56 views

Turn on LED with the opening of a switch

Hi I’d like a circuit that turns on an LED when the switch opens. I’ve made this so far, but it’s drawing too much current in the “off mode” that it will just drain my battery. Any ideas? I’ve seen ...
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1answer
42 views

Choosing the right MOSFET for 5V power relays

I am planning following circuit PR_SIG: a 5V logic level coming from a uC +5V: is powered trough a external power supply (max 10A) Power_relay: 5V, needs 70mA to switch My problem now is choosing ...
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1answer
35 views

How to flip LTspice voltage controlled switch so that it opens at threshold voltage? (versus close)

I am trying to figure out how to tell the VSWITCH of the LTspice program to open after it crosses the threshold voltage and close when it is below (with hysteresis). Normal behavior is that with Vt ...
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4answers
69 views

Pin Layout Unknown - 5-way navigational switch

Completely at a loss, been searching for a datasheet or anything to help for a cou0ple hours... So I came to the only place where I can usually find help Does anyone know what the pin layout of this ...
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2answers
47 views

Wiring a 6 pin On/Off/On toggle switch (DC) 2 Pole

I bought a 2 pole 6 pin On/Off/On toggle switch that's for DC power, (25A 12V) see here: Toggle Switch The only issue is that I have no idea how to wire it, as mentioned, it has labels on the back, 1,...
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2answers
53 views

Switch to turn off motor and another to turn the motor on

I have a DC motor that turns a gear which then has an arm that will hit a switch which turns the motor off. Is there a way for me to build this without using a microcontroller? Like I start the ...
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1answer
80 views

Is there a disadvantage to not having a power switch on a logic circuit?

I'm building a digital clock using 40xx series IC's. Currently you just plug it in and it's on. Are there any major drawbacks or disadvantages to not having an on/off switch?
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2answers
31 views

Is Capacitive/Clock Feedthrough signal-dependant?

I am wondering about the phenomenon of capacitive/clock feedthrough in a simple MOS device with a hold capacitor. For example consider the following If a parasitic Cgs appears, then surely Q = CV ...
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1answer
59 views

Keyboard switch removal problems

I recently put together a keyboard and had an issue with a couple switches so I decided to re-solder. I resoldered 2 and that fixed the issues but for this last one I started smelling something ...
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1answer
27 views

2 Pin Reed Switch Normally Closed Effect using BC547

I am very new to electronics. I am using a reed switch with 2 pin. Which acts as a switch near to magnet. I want to keep the switch ON when magnet is not near and OFF when its near to magnet. I ...
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1answer
61 views

Automatic watt/volt/amp switch

Google has failed me so I'm asking here. I am looking for an automatic switch, which will change state depending on the number of Watts/Volts/Amps flowing through the circuit. As an example: When ...
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1answer
84 views

Trying to wire up a couple dozen LED-lit toggle switches to an Arduino Mega

Update: Worked out a rough (I'm sure) schematic of the current idea for a smaller version of the circuit. A bit of info before the question; The Arduino has a current cap of 200ma across all I/O pins,...
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4answers
55 views

2 / 4 quadrant switches - how can current have opposite direction to voltage?

I am learning about 1, 2 and 4 quadrant switches, used in inverters etc. I am however struggling to understand how, in the 2nd and 4th quadrant, the voltage can have an opposite direction to current. ...
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3answers
165 views

Detecting switch closure

Any techniques/circuits/sensors that can determine the open/closed state of a set of contacts, independently of whatever power or signals are being switched by the contacts? Obviously easy if there's ...
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2answers
53 views

Switch Individual Lights In LED Series

I am working on a hobby layout that will have LED lighting for some of the elements. I would like to individually switch LEDs in series on/off. I used ledcalc.com to generate the circuit diagram ...
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0answers
37 views

Reducing Common Mode Voltage at the ADC input

I need some help from you expert engineers. I have to automatically measure VCE / IC and VBE / IB of a big bunch of transistors under specified collector and base voltages. Since Vcin and Vbin can ...
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1answer
37 views

How can I create a series switch with a transistor for low power application

Hi, I would like to make a switch that turns on/off input Vbattery to a analog (AIN) pin of uController used to measure battery level. The uC also should control if the transistor is providing the ...

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