Questions tagged [switches]

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

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Activate 4-pin RGB LED Strip-light 5050 to micro switches

I’ve Checked everywhere for a solution to my issue. Hopefully you guys can help out a novice. My goal is to activate my 4-pin RGB LED strip light(s) (5050) with a micro switch(s) when the force weight ...
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1 vote
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Best way to implement bypass circuitry for analog crossover filter circuit?

Below is a system block diagram of a schematic / PCB I am working on. It is an SOC with two differential audio DACs (left and right audio channel). Each channel has a fully differential cross-over ...
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1 answer
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Cannot turn off noise cancelling on Bluetooth headphones

I recently dropped my Mixcder E9 headphones. These headphones have active noise cancelling. After being dropped, the noise cancel switch stopped working and the active noise cancelling is always on. ...
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2 answers
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Mimimum time required for an NMOS transistor to operate as a switch?

How do I calculate the minimum time required for an NMOS transistor to work properly as a switch i.e. in the triode region? When the time period is very narrow, the switch might not turn on and our ...
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3 answers
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Touch sensitive arcade

I'm 3D printing a series of motorised automata. I want to display these like an arcade in my window that fronts the street. To make them interactive I want anyone interested to be able to switch the ...
1 vote
2 answers
57 views

How to turn ON/OFF NE555 using a pushbutton switch that is already to ground?

I'm building a circuit for my motorcycle to replace a damaged indicator module. It runs off a NE555 to turn on another NE555 in astable mode to flash the bulbs. The switches on the bike are push ...
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1 answer
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Reset push switch for LDO regulator

I have a XC6220B331MR-G 3.3 V LDO voltage regulator that supplies power to the MCU along with some other components on my board. The regulator has an enable pin which I connected to VIN so that the ...
-3 votes
1 answer
30 views

How do I set Ron and Roff for SBreak switch in PSpice or OrCAD capture?

I am using SBreak but when I click in the properties I only see: Model, REDFES, TEMPLATE, SIMULATION ONLY, and PKGREF.
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1 answer
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Identify the correct code of an SMD transistor used to switch a relay coil

I have a problem with identifying an SMD component that I'm sure is burned and has to be replaced. It should be a transistor used to switch the 24 V coil of a J01A-24-F relay. Input at the supposed ...
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Galvanic-coupled switch ground tracing

How trace power switch ground in right way? All signals must have as short traces as it can. But i forced to pass weak signal through the entire noisy power ground if im have galvanic coupling (...
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12 V relay with a switch to control fuel pump relay

Is it possible to control a fuel pump relay with another relay with a switch? I want to touch a capacitive switch before turning the ignition key all the way to turn the fuel pump on. Then when I turn ...
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Limits to I2C switching multiple RFID/NFC readers with Raspberry Pi and I2C switch

I am trying to set up an assembly line scenario where an item with and RFID tag is slid across an assembly line to different stations on a table. In the image below you can see ID tags A and B as they ...
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How does this relay work?

I took apart an old dark-activated switch yesterday and found an interesting electromechanical switch inside. I think it's a relay, but I'm a little mystified by the principle of operation because ...
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3 answers
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How to add a DOWN limit switch to a Harbor Freight (Pittsburgh) hoist [closed]

I am using a pittsburgh hoist to raise and lower a large curtain. The hoist has a built in limit switch to stop when it raises to a certain point. I need to add another limit switch to stop the hoist ...
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2 answers
92 views

Why is a spring used in an electrical switch?

Note: I am not talking about a circuit breaker where a spring is used to counter the repulsive force generated by current passing through a small contact area. This question is about switches designed ...
1 vote
1 answer
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Is this a SPDT On-On switch?

I want to install a Master Switch on a paramotor using the correct switch. Would appreciate your help to clarify the specific type so I can order the correct one from Mouser or Digikey online. Master ...
-1 votes
0 answers
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Is it OK to use a lower voltage rated momentary switch if I have a resistor inline?

I am planning to build a 48V LiFePO4 off grid solar system. I am trying to add a pre-charge resistor to the design to prevent a large inrush current to the devices. I want to add a momentary button ...
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3 answers
43 views

ESP32 DevKit not booting because of button

I developed a PCB for a project I'm working on. Today after assembling I tested everything and all relays where working as well as the ESP32 itself. Then I connected the sensors and it stopped booting....
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2 votes
2 answers
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A question about switch rating

I have a PSU with 60A inrush current. If I use this switch to turn ON the PSU, can it survive the 60A inrush in the long run? I cannot see such parameter is given in switch datasheets.
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8 votes
2 answers
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What are strange characters and dashed lines above switches?

In the picture below, what are the weird symbols over the switches? I've circled or pointed to them with red.
1 vote
6 answers
150 views

Pressure activated switch for a light up LED straw? Similar to how a vape pen activates with air pressure drop when sucking?

I’m looking for a component that I can integrate into an LED straw so that when the user starts sucking on it the light turns on. What should I be looking at? I disassembled a Juul pod and see that ...
9 votes
5 answers
2k views

Using a 2 A, 48 VDC rated switch in a 8 A, 12 VDC circuit

I have a push button make/break switch rated at 2 A, 48 VDC. I want to use it on my aircraft in an 8 A, 12 VDC circuit. Can I use this switch in this circuit or will the switch burn up?
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1 answer
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Replacing the mechanical switch with digital that has low on-resistance

Please take a look at the picture below. What I am trying to do is designing a "switch" that can close the circuit so that the resistance meter can measure the resistance of the resistor. I ...
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4 answers
154 views

How to toggle two LEDs with a minimum of components?

At a science museum today my kids and I visited an electricity challenge. First they were given a battery pack with two AA cells, a DC motor, a few lamps and switches, and a bunch of little jumper ...
1 vote
2 answers
76 views

How to safely switch a high voltage transformer?

I am trying to make a small model internal combustion engine controlled electronically with an Arduino. The idea is that fuel is injected and ignited with a small spark from a small high voltage ...
1 vote
0 answers
48 views

Switch on a motor circuit board

Attached is a photo of a switch on a Genie garage opener motor circuit board. What is the switch for? Almost seems like an insulating tab is inserted between contacts that should be removed before ...
2 votes
2 answers
146 views

P-CH MOSFET high-side switch not turning on

The datasheet of SE2305Q is HERE I have an LCD screen that comes with a backlit_power pin which requires 3.3 V to light up. It draws quite some current, and I don't think it is good practice to ...
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2 answers
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How can I configure an Ethernet switch to a hub to use with Wireshark? [closed]

I would like to use Wireshark to watch the communication between my device and the server. I basically need an Ethernet hub to deploy the environment of testing. My trouble is that Ethernet hubs are ...
1 vote
0 answers
33 views

Switching two relays using the same 1no1nc latching switch

I am working on a device to control power to some telescope devices. I am using a 12 VDC, 20 A power supply block; this will be switched using two relays (10 A each) to the load devices. I have two ...
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1 answer
47 views

Is it possible to create an A.B' logic using classical switches?

I'm new to electronics and I've been trying to make a device that reminds my father to charge his scooter when he comes into the garage. Here is the circuit diagram: Switch S2 is a footpedal / ...
5 votes
1 answer
541 views

Buttons that do not bounce or scopes that pretend to be 100 MHz but actually aren't?

I have bought single push buttons in India for 1 rupee a piece, that's a penny or so. They are seemingly very basic (you can see them around here other question). I might follow up here with more ...
1 vote
1 answer
64 views

Can a single device connect to two different power outlets?

I’m designing a desk with electrical parts onboard that need to be plugged into a wall outlet. I’d like the desk to have two power inlets that can plug into the wall—one on each side of the desk—so ...
1 vote
1 answer
49 views

Help with selecting the right push button

I am making a lamp that will have the following components (in order of flow of electricity from wall socket to bulb): Type A plug, 120 V On/off push button with alternate action (if I understand ...
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Is it possible to create crosspoint(crossbar) switches with FPGA?

we have 4 USB type C ports in one of our projects. We are using TPS65988 and TUSB546A-DCI for PD control and crossing USB signals. We want to take design to the next level with the crosspoint switch, ...
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5 votes
2 answers
546 views

How does a basic SPST analog switch differ from an ordinary switch?

In the test circuit I'm building there is a 1 kHz PWM signal passing through a DG467. As far as I know, the DG467 was placed there to interrupt the signal if needed, like an electronic on/off button ...
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Which type of limit/microswitch is this?

Which type/model of switch is this? It is used as a limit switch for a gear rail. Found inside the cinema filter mechanism for Epson TW-9300 projector. The other one has degraded and is now missing ...
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AC MCB or DC MCB

I'm using MCBs on one of my projects involving a battery pack. Is it safe to connect using an AC MCB (Brand Legrand India) for switching between the states (on/off)? Vbat < 100 V, expected current &...
1 vote
2 answers
61 views

Best switch type to turn off the mains voltage to electronics [closed]

Basically I am making a reflow plate, that requires mains voltage for the heating plate. I have a basic knowledge of mains voltage and am just trying to make the product as safe as possible, by adding ...
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Possible faults for significant kVA differences in switch cabinets?

Would there be any faults if any on the cables, either nearby or near the switch cabinet if there is a significant kVA difference say 2x-3x? For example, for 3 phase wiring, 2 cables having 1000 kVA ...
2 votes
4 answers
105 views

Switch on when voltage detected

I'm adding a Google Home Mini to an antique floor radio. I don't want to toss the original components, so I'm planning on wiring the speaker to the Google Mini and want to add lights that come on in ...
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1 answer
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VAC/VDC Control input voltage in Solid state relay

I have been trying to understand the datasheet of solid state relays from different manufacturers and I was not much familiar with solid state relays. A confusion arose when I came to see the control ...
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1 answer
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Circuit to turn relay on/off based on button press

I'm using a CPU case to enclose a diy project and I'm looking to see if I can turn the main circuits power supply on using the on/off switch in the front panel of the case. The button needs a circuit ...
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1 answer
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What kind of switch to use for output power in a variable bench power supply

I am some what new to electronics. I have been designing a variable bench power supply from an ATX. I want to add two output power switches: One to the low current low voltage variable output rail (...
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1 answer
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Schematic Review: PIN diode switch driver

I've designed a PIN diode RF switch driver, specifically to drive HP33000 series switches. Unfortunately, these are very old, and not much documentation exists, so I'd like to ask for advice from ...
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What is the purpose of capacitors in 6.302.0x propeller circuit

In this course on edx it introduced the assembling of this circuit for the labs However, I can't totally understand the purpose of some components in the circuit (shown below) What is the purpose of ...
0 votes
3 answers
68 views

Discharge lithium ion battery to a specific state of charge

I am trying to make a circuit to discharge a 4s battery pack to 30% state of charge to ship it safely. I will be doing this from time to time and would like to discharge the packs rapidly (around an ...
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1 vote
3 answers
131 views

Issue with NPN transistor as a switch

I am working on this simple circuit, which uses a BC547 transistor to switch ON a LED when trigged by a switch. The scenario is the switch is connected after a long wire about 20 meters. Issue: When ...
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1 answer
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Proteus design buzzer quiz circuit

I am trying to design a 12-people buzzer quiz game. I just want to use LEDs and AND and NOT gates, using one switch for reset. The problem is that after designing it all the odd LEDs or even LEDs ...
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1 vote
3 answers
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Component Placement Strategy for Regulator and Controller

I am reading this interesting document from TI PCB Layout Considerations for Switchers It explains the issue of the return path for high di/dt currents in regulators. To summarize my understanding, it ...
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1 vote
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16A AC rated switch contacts welding with 36V battery and capacitor. Can a series inductor fix this?

I have an old Black&Decker battery powered mower that uses a 36 volt SLA battery pack. The original motor failed catastrophically and I now have a 24 VDC motor adapted to fit. I added a PWM buck ...
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