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Questions tagged [switches]

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

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3 answers
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SPDT with high amps

I have 3 DC power supplies that can each supply 320 W. Input to these power supplies comes from AC wall power and is gated by an on / off switch. I have 2 different loads: DC 35 V, 22 A DC 35 V, 17 A ...
Sohil Sathe's user avatar
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0 answers
32 views

Controlling a device in a car using a button and ignition

I need to connect a device to my car. I thought about using an XOR gate because: A - button B - car ignition. If the car's ignition is off (0), pressing the button (1) will turn on the device (1). If ...
jminhal's user avatar
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0 answers
29 views

Using a Latching Button for Car Hazard Lights with LED Indicator

I'm attempting to learn more about electronics with this small project I am using a latching button . I connected the button to the ignition wire of the car because I want the LED to stay on. My ...
jminhal's user avatar
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2 answers
62 views

turn on an LED with a pressure switch but it will not turn off until you reset the switch

So first off I'm new to all of this electronic stuff. I understand the basics but that is it... so this is what I'm attempting to do. I want a pressure switch that will turn on an LED light, but i ...
Dan Hladil's user avatar
0 votes
1 answer
33 views

Could I use a linkstyle momentary dpdt switch?

This is a switch from my cars sunroof. It is a Lincoln Town Car so the part is Ford. I need to replace this switch and I am wondering if I can just get a linkstyle dpdt switch and solder these four ...
ConnerWithAnE's user avatar
2 votes
1 answer
122 views

Unknown SMD component - PCB Designation question

I have a board we are trying to repair. We are unable to get any technical documents from the manufacturer, no schematic or BOM for the board. This has multiple switches, think metal dome you press ...
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0 votes
1 answer
68 views

Where should the base resistor be placed in a PNP switch?

I would like to understand the difference between placing a base resistor at R2 versus R4 when implementing a PNP switch. It seems there is no difference whether I place a 4.7K resistor at R2 and ...
BOB_Engineer's user avatar
0 votes
1 answer
63 views

How to switch off boost converter inside 3.7v battery modded device using devices own on/off switch

I'm probably doing something dumb, but I'm trying to learn!. I'm converting my 9v multimeter to use a rechargeable battery with a boost converters, which seems to be working great so far, but I want ...
luminousfox's user avatar
1 vote
4 answers
380 views

How does the common pins on rotary DIP switches work

I am having trouble understanding how the pins are connected in rotary DIP switches, specifically this one. My interpretation is that 4 separate inputs are connected to pins 1,2,4 and 8 and based on ...
zoghii's user avatar
  • 177
1 vote
1 answer
45 views

Refine identification on this "tactile" switch

I'd like to identify this switch: After poking around on Digikey and comparing the measurements, I believe it's a Panasonic EVQ-P0N02B or EVQ-P0Q02Q. It does not have a GND terminal. The button width ...
SSilk's user avatar
  • 165
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0 answers
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Soft Latching Power Switch with extra input

I'm working on a project that will be battery and/or USB powered. I would like to implement a soft power switch with the following functionality: Pressing the power button for ~1s turns on the device ...
Chris's user avatar
  • 95
2 votes
1 answer
77 views

Understanding symbol of a latching push switch

I want to understand the schematic symbol for the illuminated, latching push switch I am using. My objective is to use it simply for ON and OFF purposes. Link for the part and datasheet. Symbol from ...
Tahoor Asim's user avatar
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0 answers
23 views

Clock feedthrough of the bootstrapped switch

I'm learning about the bootstrapped switch through this paper. Razavi used a 20 µm / 28 nm NMOS (M1) as the main switch to achieve low Ron. I am wondering does this wide device cause any problem ...
Jack Black's user avatar
5 votes
2 answers
1k views

How does this switch work on each press?

I'm trying to replacing a broken switch in my 1986 Corvette. It's in the door panel which can be pressed to turn the door panel interior light on and off. The switch itself has only the manufacturer ...
LarryBud's user avatar
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0 votes
2 answers
45 views

Switching the circuit ON and OFF using 50mA rated push button latching switch

I need some help. I want to power the circuit ON and OFF using a 50mA latching push button. The idea I came up with was to use the En pin of the boost converter. I am using it to turn the boost ON and ...
Tahoor Asim's user avatar
0 votes
0 answers
46 views

Dimmer circuit for LED brightness control

I have a circuit using 555 timer with 2 tact switches to increase and decrease the brightness of LED, but what I need is to store the last state of circuit whether it is on/ off and also automatically ...
Nan dv's user avatar
  • 1
8 votes
1 answer
934 views

Logitech G604 Mouse button switch circuitry does something... unusual...? Does anyone know why?

I was replacing switches on my Logitech mouse to resolve the infamous double-click issue. While I had my mouse apart for repairs, I decided to hook up an oscilloscope to witness the double-clicks ...
Hunter S's user avatar
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1 vote
0 answers
49 views

Identifying replacement for micro-switch, 8.5X8.5mm, locking, vertical, button, dip solder, 4 pins,

I am having difficulties to identify a spare switch and a supplier. The defective part is on an old Multiblitz Varilux 500 studio flash. The german company Multiblitz went out of business in 2016 and ...
Yves's user avatar
  • 111
0 votes
1 answer
43 views

Guitar pedal mod - trigger button presses from a microcontroller by shorting the switch contacts?

I have a guitar foot-pedal (Boss RC-300) and in order to do a lot of the navigation and configuration of the pedal I have to keep crouching / bending down to change patches or change settings. I would ...
Boloar's user avatar
  • 127
0 votes
2 answers
83 views

Using a three terminal PCB slide switch for on/off control

Most of on/off PCB slide stiches has 3 pins(terminals). And I want to use this such switch as on/off switch for the following part of a circuit: Above SW1 is the 3-terminal slide switch I want to use ...
user1245's user avatar
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0 votes
0 answers
32 views

Convert PWM negative signal to either On or Off signal

I am trying to make a simple conversion circuit to take a negative PWM signal from my cars dome lamp signal and simply make it or or off. I believe I should be able to use a PNP transistor and ...
Jaxon's user avatar
  • 1
0 votes
1 answer
59 views

For a disabled person's ring, how might a switch be added to the device that is waterproof and totally durable?

I have to cram a lot of electronics into a very, very tiny space. Microcontroller, battery, charging circuit, sensors, display, and an activation button into a ring on my finger. It's a device for ...
user30997's user avatar
  • 408
0 votes
1 answer
57 views

Switch Protection

I am using SPDT and multiplexer switches in my design and these switches are directly connected to Px connectors for various channels. Transducers (capacitive load below 500 Ω) are connected at Pin 2 ...
user135156's user avatar
6 votes
2 answers
297 views

Analyzing Diode Quartet Switch

I am trying to understand how this diode quartet switch works. I am having trouble dealing with the two current sources. I can think about what happens to the voltages in the circuit, but how do I ...
Axodarap's user avatar
  • 157
0 votes
1 answer
43 views

Switching a low current/low voltage line with a high current/high voltage one. (Detecting current flow)

I am working on a design for an model rocket launcher. I have an Arduino Nano Every in the design, and am hoping to use that of the continuity test. When the user presses the cont. check button, it ...
Elijah's user avatar
  • 3
6 votes
3 answers
732 views

IGBTs fail after high current, high voltage switch, despite being lower than absolute maximums mentioned in datasheet

I'm using FGH60N60 IGBT as a switch. The circuit is basically a capacitor-discharging circuit. I have a 10 mF capacitor charged to 310 volts and connected to 2 Ω of load via this IGBT (I connect 4 ...
pouya nosratkhah's user avatar
-1 votes
2 answers
96 views

Typical output characteristics table of an NPN transistor

The Ic - Vce table for the 2SC2411K transistor is given below. As it is known the right side of the table represent the breakdown region. That is, does the Vce > 5 V region enter the breakdown ...
Mhan's user avatar
  • 377
0 votes
2 answers
106 views

BJT circuit questions

I have landscape lights. The load is 3 VDC 100 mA for each filament. I have two of them so the load is 200 mA at 3 VDC. I have solar panel which varies voltage from 0 V to 1.5 VDC. I want the ...
hhsting's user avatar
  • 45
1 vote
1 answer
47 views

Selectively Activated External Circuit for ADC Measurement

I'm looking for efficient yet simple-to-integrate solutions where analog signal outside of microcontroller's range is being measured (e.g. 12V power supply) and measurements are done selectively. This ...
lucenzo97's user avatar
  • 2,442
3 votes
3 answers
169 views

How to light up a rocker switch powered by a battery of only 1.5v?

I have a small hobby project for which I wired 4 AA batteries in parallel to achieve the desired result, which comes to 1.5V, as the batteries are in parallel, which is what works for my project. My ...
electrical's user avatar
1 vote
2 answers
88 views

How to eliminate voltage spike when power supply is switched on with mechanical switches

Let me set the scene first: we have a special racing vehicle, where the power souce is a 12s Lipo battery pack (Nominal Voltage = 48V, Maximum = 52V). The battery is protected by our own Battery ...
István Kecskeméti's user avatar
0 votes
3 answers
62 views

What is the purpose of SW1 in the schematic for a battery gauage IC

Does anyone know what the purpose of SW1 is? The schematic says LED Display but I do not see how this is used for the LED display. The datasheet is found here.
JoeyB's user avatar
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2 votes
1 answer
79 views

Would This Be a Good Bipolar AND Gate?

In my last question, I asked about this schematic that I made: My question was answered and I got some good advice, so I recreated the circuit with the new knowledge in mind, which looks like this: ...
Sqidy P's user avatar
  • 67
1 vote
0 answers
43 views

Hot-swappable battery in series

I'm trying to figure out a circuit to power a robot with multiple BLDC actuators, with two 6-cell LiPo batteries and would need some advice on safety and possible power switching. Please pardon my ...
Greg's user avatar
  • 21
1 vote
0 answers
86 views

Double Vs Single Bow Tie Transmission Gate Symbol

Is there any difference between two symbols (at the below link) or there totally identical at a functionality level and the only difference is visual just for aesthetic purposes? https://en.wikipedia....
DarkKnight's user avatar
0 votes
0 answers
23 views

Switch Symbol on a Datasheet Block Diagram [duplicate]

I have seen quite a few times in datasheets this switch symbol (at the red circle on the attached picture) on block diagrams. Do you know what is his formal name and if it isn’t a “simple” switch (...
DarkKnight's user avatar
8 votes
1 answer
1k views

How can I make this AC current switch turn on at 20mA instead of 50mA?

I've bought this AC current switch, which is sensitive to currents from 50 mA to 5 A on the single AC wire that passes inside its hole. When currents from 50 mA start to flow in the wire, it allows ...
Rodrigo's user avatar
  • 567
-1 votes
1 answer
64 views

Used Transistor as Switch LED

I designed simple circuit using transistor as switch for my led. I used npn transistor. The input voltage is 46V. The current input is 15mA. My question is my circuit is correct or not?
Kim's user avatar
  • 59
0 votes
1 answer
74 views

Single momentary switch to control latching relay

I'm interested in using a single momentary push-button switch to control a latching relay. The idea is for the switch and relay to function as an on/off switch for a high-wattage load (13.8V DC, max ...
Jonathan W.'s user avatar
0 votes
1 answer
55 views

FET selection and quantity for buck-boost converter design

I am working on designing a buck-boost converter where the input voltage is 24 V regulated, and the output voltage ranges from 12 to 48 V with a current rating of 5 A. The design should also allow for ...
chami's user avatar
  • 524
0 votes
1 answer
43 views

How to make a current sensing circuit for oxygen concentrator to generate alarm when no current on cord [closed]

The plate on back of my wife's oxygen concentrator reads 120 VAC, 60 Hz, 6 A. It seems like the amps must fluctuate when it sounds like a pump turns on every 7 seconds, but the unit runs constantly. I ...
Bobser's user avatar
  • 1
0 votes
3 answers
284 views

What will happen if a bulb is connected to two live wires?

In the two-way switch below, the bulb can be connected to either two hot wires or two neutral wires to turn it off What will happen if a bulb is connected to two live wires? Will the current flow ...
Rin Hoo's user avatar
1 vote
3 answers
120 views

Unexpected Overshoot with Switch Bounce

I am measuring switch bounce on a breadboard with a simple push button switch in series with a 100K resistor. Circuit power is s 3 channel Siglent SPD 3303C. Measurements completed with a Rigol ...
luther_stanton's user avatar
-1 votes
1 answer
60 views

How do I flash LED with signal from 555 timer ONLY when button is pressed?

I am trying to make a circuit in which an LED is off until a button is pressed, and then it flashes with a 1Hz signal from a 555 timer. Currently, its default state is flashing with 1Hz and when the ...
Chandler Thornton's user avatar
0 votes
1 answer
87 views

Driving a power MOSFET successfully

I have recently purchased this power MOSFET for a project (dump load resistor): https://uk.rs-online.com/web/p/mosfets/6867852?gb=s Alongside this I have bought a MOSFET driver see link: https://uk.rs-...
Jasper's user avatar
  • 49
3 votes
1 answer
79 views

Voltage drop issues in LTspice simulation for buck converter using SW model

I have a LTspice design issue where I encounter the same problem, even when I use other available simulations. Whenever I increase the load, there is a significant drop in voltage, despite having ...
chami's user avatar
  • 524
0 votes
0 answers
84 views

Single Switch with Momentary and Latching/Hold Properties Using CMOS/Logic (no µP/microprocessor)

I am looking for a CMOS/logic based solution (no µP/microprocessor) to a momentary switching scheme I'd like to implement that involves the following scenario: 1: pressing a momentary switch engages ...
paraparabolic's user avatar
0 votes
1 answer
128 views

Float Switch and relay for pump

I have a pump that's only required for the occasional use with excess water, - https://www.al-ko.net.nz/alko-product-range/sub-6500-classic - and this is only required when the water is 50-70mm deep. ...
MPG's user avatar
  • 1
1 vote
1 answer
95 views

Charge batteries in parallel, discharge in series

I'm interested in building lithium ion battery packs, and I was wondering if there is a way to change the pack on the fly from series to parallel - basically to allow charging in parallel and ...
Alex I's user avatar
  • 3,481
0 votes
1 answer
44 views

Switching power and controlling RPi GPIO pins with a single rocker switch

I have a 12V amplifier board with the sound source being a raspberry pi. I'd like to have a single rocker on/off switch that both turns off power to the board, as well as connect to the RPi GPIO pins ...
youcloudsofdoom's user avatar

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