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Questions tagged [switches]

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

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41 views

LED and optocoupler MOSFET switch connected with an inductive load

I want to ask, if this circuit will work. I think the flyback from the inductive load the mosfet is connected to will break the optocoupler. The LED is connected through a resistor which should ...
1
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1answer
65 views

Pausing a clock signal generated by 555 timer

I am planning to make a simple integer adder/multiplier which needs a variable frequency, comparatively slow clock (around 1 to 200 Hz) for demonstration purposes. I used the following generic 555 ...
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0answers
37 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 ...
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1answer
32 views

Making a 2/4 channel buzzer with light

I am making a project, basically consisting of 4 bulbs and 4 switches. I want to make it such a way that when either of the 1 switch is pressed 1 bulb should glow. The bulb which glows should be the ...
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2answers
119 views

How can fully charge a capacitor without having it prematurely discharge?

I am looking to power a circuit using a 5.5V, 5F supercapacitor. I want to charge it to approx. 5V but I don't want it to discharge into my circuit until it has charged to 5V. I can do this by simply ...
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1answer
116 views

Finding total energy for RC discharged capacitor at t = ∞?

Most Rc circuits are not as severely difficult as this kind of circuit. I'm trying to solve for both the time constant and the voltage V2 across the R2 resistor, both of which will hold the necessary ...
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1answer
21 views

Trying to Build a voltage-driven smart shunt/threshold switch

I'm trying to build a smart DC switch that measures the input voltage (3V to 40V)1 and determines to which output pin to send it, similar to this threshold switch idea or a SIP3242 for Vin, not load ...
4
votes
1answer
63 views

How do you close a switch on a high-voltage network?

This is something I've been curious about for a long time. Let's say you're a utility trying to connect two segments of a distribution grid. Both segments will have about the same frequency, because ...
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3answers
83 views

Do 240V AC switches only need to open the active wire?

I want to add a simple inline switch to a small, mains powered lamp (~240V AC, 10W Max). It's earthed; it has a typical 3-core cable with a 3-pin plug. I bought a bunch of switches, expecting ...
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1answer
90 views

RF switch acting like a splitter

I'm trying to use a pair of RF switches (SKY13421-486LF) to switch two channels between the circuit output and a matching resistor: I have two inputs and want to pass one to the output and dump the ...
1
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0answers
77 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 ...
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2answers
33 views

How to enable battery management IC

The TI's battery management IC BQ2403x have the chip enable signal which needs to pull up when working. There are four potential power sources to enable this CE signal which are: AC, USB, BAT and ...
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2answers
53 views

Wiring of body terminal in a network of MOSFET switches

I am trying to design a set of switches in a cmos design. The switches are supposed to control a number of capacitors and I want to implement them as single NMOS or PMOS transistors. Based on my ...
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1answer
47 views

I need to connect a 12V device to Raspberry pi

I need to connect a 16mm press Push Button Switch flat round Latching Self-locking 1NO 1NC with 12V rating to Raspberry pi3. (https://www.aliexpress.com/item/16mm-Metal-brass-Push-Button-Switch-flat-...
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votes
1answer
52 views

How can I make/find very small on/off 3x3x3 mm switches? [closed]

I'm looking for very small on/off switch that fit in a 3x3x3 mm bounding box. The application is a tiny figure and all the electronics need to be contained within the body. There is an LED, coin ...
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1answer
56 views

Audio jack detection to turn on device without power loss

I'm trying to make simple headphones amp and I wonder - is there any way to use stereo jack connector with N-C switches like this: to turn on the amp so the battery is mechanically disconnected? I ...
1
vote
1answer
87 views

Can i use an AC 15A 250V / 30A 125V rocker in place of a 15A 125V / 10A 250V one?

Amazon sent me the wrong replacement switch so i am wondering if i can use it? Original switch is AC 15A 125V / 10A 250V new one is AC 15A 250V / 30A 125V can i use it without damaging the ...
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1answer
47 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 ...
1
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3answers
81 views

How to get a 24 V signal generated when the input circuit state changes?

So I'm an IT guy with no electrical experience trying to figure this out. How do I set up a circuit that puts out a 24 V signal for a short time or puts out a continuous 24v signal that quickly turns ...
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votes
3answers
192 views

How to control two separate circuits with one switch? [duplicate]

I have two separate circuits with different types of diodes. One circuit draws 3,5V and the other draws 9V. How can I wire this up so that one switch can turn both circuits on or off? As far as I ...
1
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2answers
254 views

LED Circuit design (4 switches, 1 potentiometer)

I need to design an LED circuit that acts as a switching system. It must meet these specifications. Case 1(Press Button 1): LED 1 ON, LED 2 ON, LED 3 OFF Case 2(Press Button 2): LED 1 ON, LED 2 OFF,...
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0answers
18 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 ...
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1answer
75 views

Op Amp as a simple switch

I want to build a little voltage switch that switches on a buzzer and a relay when a certain voltage is reached. Please have a look at the schematic. I use a trim potentiometer to set up the switch ...
0
votes
1answer
44 views

Change PCB-mounted switch

I have this Bi-Direction Switch: (Image source - front of switch) (Image source - back of switch) I want to change the Button/Switch (I don't know the exact English word) to this one, for style ...
53
votes
3answers
7k views

Fan speed switch: why OFF :: HIGH :: MED :: LOW?

Many AC fans, including inexpensive floor models, have a rotary speed control which rotates from OFF to HIGH to MED to LOW. Since the switch does not rotate 360°, you have to rotate it backwards to ...
1
vote
2answers
67 views

Is there an IC like the ULN2003A but for high side switching? [closed]

I'm looking for an IC to switch multiple ground-connected loads but having trouble finding a suitable chip. Is there anything kind of like a reverse ULN2003A but with a common collector and multiple ...
1
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0answers
52 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 ...
9
votes
1answer
1k views

Why does this microswitch datasheet specify a minimum load current? [duplicate]

The Omron VX series datasheet mentions on page 6 that "Using a model for ordinary loads to open or close the contact of a micro load circuit may result in faulty contact.", and shows that their micro ...
0
votes
1answer
81 views

8PST switches, do they exist? (not 8SPST DIP Switch) [duplicate]

I'm looking for a switch that can connect/disconnect 8 signals at a time with one button/lever/slide whatever. Power requirements are very low. I do not want to use analog switches due to interference ...
1
vote
2answers
253 views

How can I use a transistor (2n2222) to act as a switch with this 12V momentary switch? [closed]

I have a garage door setup that is basically like the following: All I want to do is add a new remote switch into the system. I basically want to add a circuit into the previous schematic in the ...
1
vote
1answer
40 views

Understand limit voltage and current

It could sounds odd but I am trying to find a switch for my inverter that is an isolator. My batteries are 12 V and my inventer can do over 5 KW, but I found a switch at 48 V, rated 300 A. If I use ...
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1answer
63 views

Can I use an NPN BJT transisor as a standard switch?

Is is possible to use a NPN transistor as a normal switch? If I put 5 V on the transistor base the switch is closed and if there is 0 V on the base the switch is open. Does the transistor need to ...
1
vote
1answer
49 views

Designing an PCIe ethernet NIC with built in ethernet switch

I am trying to design a ethernet network card that will plug into a PCIe slot and have 2 etherenet ports visible to the user that are connected by a unmanaged layer 2 switch. My architecture ...
1
vote
1answer
32 views

High AC voltage on Touch Sensitive Switch

I recently got a 120V/240V On/Off Touch Switch kit (ZIJIA P12-L56). They are a cheap way of adding Touch Lamp functionality to a standard lamp. It works great and I immediately started poking ...
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1answer
27 views

Use both manual switch and WiFi Smarth switches together

I have Sonoff Basic WiFi Smart Switch that I would like to connect to my lamp and control it via phone. However if something will go wrong, or there would not be ...
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1answer
47 views

Radio activated on/off switch

TL;DR: I want to know if there is anything, That on which when a radio frequency falls, and it turns on an LED. Basically an on off switch but controlled when radio waves hit it. What I hope to ...
0
votes
1answer
114 views

PNP Transistor switch circuit

I have been learning about transistors a lot lately. Following that I have managed to design a simple circuit that uses PNP transistor as a switch. Basically this is going to be a door alarm where if ...
14
votes
7answers
4k views

Relays vs. thyristors: What is best for swiching 230 V lights on and off rapidly (~ 5 Hz)?

I am building my own disco/party lights. 230 V/60 W bulbs, and ideally I would like to switch them on and off at 5 Hz. I was planning on a simple setup with an Arduino controlling the lights. My ...
2
votes
3answers
128 views

NPN transistor as switch (actual voltage readings)

I started learning Transistors with this tutorial from the Sparkfun website. The tutorial is good and pretty easy to understand. So I decided to put my learning to the test and assembled a simple NPN ...
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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 ...
0
votes
1answer
89 views

How to build a simple transistor switch?

How to build the following: A simple Transistor turn-OFF switch. A simple transistors circuit that has its own power source, but when I apply a second alternate power source then it will switch to ...
2
votes
2answers
56 views

Add a relay to an existing switch

I want to add a relay or transistor, what fits the need best, to a simple switch, so I can control the switch by a micro computer but also keep the already installed switch so I can still operate the ...
0
votes
1answer
93 views

Turning on PC PSU with current or bridging PS_ON and COM/GND?

I really hope title is specific enough. What I am trying to achieve is that using a SATA Extension Cable to PS4 you can plug in a 15mm 2.5" Laptop Drive or 3.5" Desktop Drive and the issue is that ...
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votes
2answers
186 views

switches- What type of switch is S1 here?

S1 - Is it just a single push button switch on one side as shown on the symbol, and an open connection on the other side?!
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1answer
85 views

How to switch 7 wires with a single on/off slide switch

I am working on a project, where I want to build a raspberry pi into a nintendo 64 console, and be able to switch between with a single switch. By that I mean, I want to be able to use a single slide ...
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2answers
80 views

What could cause impulse noise on switch closure

I have a simple SPST NO Tact switch which is creating a noise pulse in a very sensitive receiver. Moving the switch, shielding etc is not possible. I need to understand how the switch is creating ...
1
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1answer
61 views

What is the actual ratings of this limit switch?

I'm going to use this microswitches as the limit cut off for motorized locking system for sliding door of my store room under the stair case. Upon checking it properly, the Indonesian made Omron ...
12
votes
1answer
1k views

Why do some toggle switches have terminals of different color?

I sometimes see three terminal rocker/toggle switches, and one terminal is a different color than the other two. Here is an example: (Image from ebay.com) What does the colored terminal indicate?
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votes
1answer
36 views

Can I use Cat6 ethernet cable to connect switches to Fibaro binary sensors

The Fibaro binary sensor ( https://manuals.fibaro.com/binary-sensor ) is capable to handle two potential-free inputs and is powered by 9-30V DC. Can I use Cat6 ethernet cable from four double ...
0
votes
1answer
72 views

Voltage controlled switch always closed in simulation

simulate this circuit – Schematic created using CircuitLab I have made the above (useless) schematic in LTspice. This after running into issues with a full schematic. The idea is to let e pulse ...