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Questions tagged [switches]

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

1
vote
1answer
40 views

The bootstrap capacitor of IR2110 and VGS of the high side is very low?

I have IR2110 that will drive two n-channel mosfets for syn buck converter with battery as load. I built the circuit and I observe the VGs1 and VGs2 on oscilloscope, which is different. it looks ...
0
votes
1answer
38 views

Switching of RS485 differential line. Two sources one output

I'm looking for a solution for my project. I have two signal sources (Primary source and Secondary source) on the RS485 (A/B) differential line. When Primary something goes wrong, the I switch over ...
-5
votes
0answers
54 views

How I get multiple signal from single wire? [on hold]

About the project - Turning on & off motor load with the help of Relay. The relay is triggering on and off by a wire arrangement in the water tank. Wires, those have been arranged to provide input ...
0
votes
1answer
41 views

Pre charge resistor switch

I have a 12V 40A motor. I have a switch between the motor controller and the battery. I want to put a pre charge resistor in the path. Like in the figure. My questions are: 1) The pre charge ...
0
votes
0answers
30 views

On off slider switch

On the above board there was a slider switch that was faulty, if I wanted to test this without the switch and short it where do I connect 2 to c, the c to the right of 2. Do I also need to jump on pad ...
0
votes
2answers
221 views

Transistor switch for VFD tube grid

I am designing a on/off switch for the grid of a VFD tube, and I would like to use a NPN transistor. The requirements are: The Grid is on when 12V are applied. At this voltage, 0.85mA flow. I want to ...
10
votes
4answers
38k views

Difference between High- and Low- side switching of power?

Is there any real difference between high- and low-side switching? Assume: Switching is for on/off control of an object (My case RPi) Base/Gate can be driven to Vcc and GND
0
votes
1answer
20 views

getting arduino PWM from 0-5V to 0-10V or 0-12V?

I have an IR2110 driver and a LOD voltage regulator 15V from a solar panel. now this will supply 15V to VCC as shown below. Since I have a LOD voltage regulator of 15V, I can't apply the same voltage ...
0
votes
2answers
53 views

How to create a switch that when pressed opens, but after a time delay returns to the original state?

I am creating a buzzer driver that turns on when the output of an AND gate goes HIGH. What I would like to create is some way to shut off the signal to the buzzer by opening an SPST switch, but the ...
0
votes
1answer
2k views

Control 12V relay with 3,3V

I would control a relay (JQX-15F) with 3,3V but I don't know any component to do it. Do you know some components to do it? For example analog switch, optocoupler o other?
4
votes
1answer
496 views

Analog switch with a fixed state when not powered?

I am looking for a chip that could handle DPDT (or SPDT, or ultimately SPST) analog switch for audio routing (in the mOhm range resistance) and can guarantee one state when there is no power supply. ...
0
votes
2answers
57 views

Devices with temporary push-on,push-off switches?

I have a couple of china-cheapie devices that seem to use some circuit with a single button where first push turns it on, second turns it off -- e.g. the button works as a toggle. I would prefer to ...
1
vote
2answers
79 views

How to make momentary connection on power on?

I have a mini-computer Beelink AP34 with momentary power button and I need to simulate short pressing of this button once it is connected to the power (12V DC). The reason is that it doesn't start ...
0
votes
1answer
53 views

How does voltage/current limits work in switches?

I want to get a rotary switch, it says that it can handle 600 V and 40 A. I will use it to turn ON two DC brushed motors of 12 V 20 A. So, the voltage is way too high but the current is just right. ...
0
votes
1answer
23 views

touch switch time problem

I was looking for a way to make a touch touch switch and i found this circuit on the internet but the problem is , it goes off automatically after few seconds is there any way that i can control it ...
1
vote
2answers
54 views

Using transistor as switch in the “middle” of the circuit

I have an rather complex circuit with button micro-switch in the middle (actually, it's RF remote control with 3 buttons). I would like to be able to simulate the micro-switch click on it with one of ...
0
votes
1answer
65 views

Single key not working on DIY mechanical keyboard (xd75re PCB and Switch both work)

I have assembled my first mechanical keyboard using the xd75re PCB. I used a plate mount, and all of the switches were installed without issue (this PCB has hotswap). When I used keyboardtester.com to ...
3
votes
1answer
70 views

Switch between 2 power supply feeds without device losing power

I have done a search on here but didn't find the answer (maybe "woods for the trees") but here goes... A brief 'background' -- In my house, there's a switch by my front door that turns on/off the ...
1
vote
3answers
58 views

High side Mosfet switch leakage issue?

Wasn't sure how to headline this but here it is: I'm debugging one of my coin cell ON/OFF switch. Circuit is as follows: simulate this circuit – Schematic created using CircuitLab Basically a ...
0
votes
2answers
35 views

Triac switch cause of heating

As a newbie to hardware design, I'm having some trouble picking components. I want to switch a 24V AC Solenoid valve using a triac. According to my research/experience, transistors heat up during use. ...
0
votes
0answers
35 views

How to create switch that changes from HIGH to LOW states when receiving a HIGH signal?

I’m creating a circuit and one of the controls is a tactile SPST switch where the common is connected to VDD. What I’m trying to do is to have some SPDT where its common is connected to a multiplexer’...
0
votes
1answer
31 views

Reverse function optocoupler in series with physical NC switch?

I've read this answer (reverse function optocoupler) but my case is different: I've got a CNC mini lathe. I have a limit switch on one of the lathe's axis ends (X+) wired as NC to my Gecko G540 ...
2
votes
1answer
42 views

Design of a motor SPDT switch that can be triggered by 5 V or 3.3 V digital output

Problem: I am designing the electrical system for a vehicle that has 12 brushed dc motors / linear actuators, they are driven by 6 identical dual-channel motor driver boards, that provide a maximum ...
0
votes
1answer
98 views

Lt-spice switch model

I have a very simple circuit and want to see the current in the inductor. But I do not know why switch is behaving like that... Actually, I supposed to get KA range current. but it gives me very ...
0
votes
0answers
11 views

Light and fan switches [migrated]

I would like to have a double wall switch for the toilet where one switch (#1) turns on both the light and the fan while the second switch (#2) turns only the fan. Please note the light and the fan ...
1
vote
3answers
88 views

Why Does this Short? [closed]

simulate this circuit – Schematic created using CircuitLab I'm new to electronics and wired a dc motor to a battery and switch. After the battery got really hot, I realized that it was probably ...
0
votes
1answer
37 views

How to bypass minimal load limitation on a power switch?

I got a power switch which seems to have minimal load that makes it incompatible with LED lights. Schneider GUPA1411BSS 1 Gang 1 Way PIR Switch — after unpacking I found it has only L, L1 and earth ...
1
vote
0answers
31 views

Can't find replacement for switch

I am trying to repair a nespresso machine(not a job, just for fun) and the PCB had the following switch: I tried to google it as "switch", "switch 4 pin", "1552", but nothing returned a switch ...
0
votes
2answers
390 views

Switch on off using triac BTA24, When off keep flashing LED lamp

Friends have a simple circuit a switch on off using triac BTA24600B, The strange fact is that when I turn off my led lamp keeps flashing fast, this is not the case with other types of lamps, only with ...
0
votes
1answer
94 views

How to multiply a voltage when its lower than 5V?

I am working with a power source of a range from 0-20V and I need to regulate the voltage to 12V. I plan to use a buck boost converter to stabilize the voltage, the problem is the input range is 5-32V....
0
votes
1answer
57 views

NPN transistor won't saturate when Vcc is greater than 7 volts

Am I missing something here? I have an NPN transistor (2N2222) with a 10K resistor from collector to Vcc. Also a 10K resistor from base to input signal. Emitter is grounded. The base input is ...
1
vote
2answers
67 views

Need to turn on a relay for half a second when constant power is applied with a switch

I'm looking for what circuit I'd need using basic components to do this task. Essentially I have a switch that turns on two relays, one of which needs to be on as long as the switch is depressed, but ...
0
votes
1answer
36 views

Relay or Transistor as low DC switch

I am working on a project for a watering controller where I would need to turn on or off an solenoid valve (electric valve), my first thought would be to use a relay, but I know relays are good for ...
0
votes
1answer
75 views

Switching circuit

I am making a switching circuit with two input sources A and B of 5 volts each and one or more outputs C1, C2, C3 etc. Source A is constant and source B is variable, has two states on and of. Source B ...
19
votes
5answers
5k views

Why can't I see bouncing of a switch on an oscilloscope?

I'm trying to view the bouncing of a simple switch on an oscilloscope. I have prepared a simple breadboard circuit (power → switch → resistor → ground). The problem is, it is displayed as a perfect ...
1
vote
0answers
32 views

Push and hold on/off switch for arduino [migrated]

Many electronic devices turn on/off, or more correctly on/sleep, by pressing a button and holding it for two or three seconds. I would like to put this ability into a project using an Adafruit Feather ...
0
votes
2answers
85 views

Variable voltage switching 12vdc

I am looking for a circuit that would be switching a relay coil and few small leds (max 3A) with a low voltage input. Now the input is variable voltage 1.1v to 5v produced by a hall sensor pot. I want ...
0
votes
1answer
54 views

buck converter with a simple bypass schematic mode?

in my design i need to place a buck converter 10-30V input with a fixed 12V output. my concern is that when the battery volatge level is low (for instance 10v) the device will stop bucking. so i want ...
5
votes
5answers
8k views

How to inverse behaviour of a switch?

I have a sustain pedal (which is just a momentary switch!) with the wrong polarity (according to the device I'm using it with) : circuit is CLOSED when pedal is pressed circuit is OPEN when pedal is ...
0
votes
1answer
46 views

BJT switches pair

simulate this circuit – Schematic created using CircuitLab I'm trying to do something like this: V1 is a variable (0 to 3.3V) voltage source, so above some value like 0.7 ~ 1.0 V I want Q1 as a ...
0
votes
3answers
48 views

How to debounce a low pulse switch for automotive lighting

Hoping you guys can give me a hand with some wiring that I can't quite figure out! Background: I'm trying to rewire a set of automotive lights - these are normally controlled by a computer but I'm ...
2
votes
2answers
49 views

Switches for current source

simulate this circuit – Schematic created using CircuitLab I1 is an wilson modified current source by 4 pnp transistors. SW1 and SW2 are doubts. When SW1 is open, SW2 must be closed and vice ...
0
votes
1answer
78 views

“Normally closed” switch with NPN transistors

Is it possible to have "Normally closed" switch with NPN transistor when the voltage at the base is 0V? So far I only managed to achieve this result with NPN transistor when the base is HIGH. When the ...
0
votes
0answers
45 views

Raspberry Pi GPIO output not working with MOSFET N Channel Switch

My circuit is below - I'm trying to switch a solenoid valve using a Raspberry Pi. I have tested the MOSFET switch with the dedicated 3v3 pin on the Raspberry Pi, and have also tested that GPIO pin ...
0
votes
2answers
90 views

How to use Arduino to control the switch on a 4.5v circuit

I've been building a wall mounted lightsaber using the below board. At the moment the switch is turning it on and off, however I want to automate this with an Arduino. Can I use a digital output ...
0
votes
1answer
83 views

Radio car USB high side switch

USB port in my radio car Pioneer deh 4000ub stopped working. I measured voltage between USB Vcc and GND and it's about 0V. It seems to be a problem with high side power switch (R5523N), because there ...
0
votes
1answer
59 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 ...
-2
votes
2answers
55 views

what is the right power supply switch for a sensor?

i'm trying to control my sensors power supply to reduce the current consumption of my project. i'm using ATmega328p that collect information from different sensors (digital and analog sensor) and send ...
2
votes
1answer
58 views

Using two momentary switches to toggle LED

So, this circuit should (in theory, at least) turn the diode on when ON button is pressed, and turn it off when OFF button is pressed. It doesn't though. The diode is powered on at the moment where I ...
1
vote
0answers
31 views

L298N motor driver not working after connecting SPST switch

So when I had all wired as depicted in the first image, it worked fine, no problems. The red LED on the L298N board was illuminated and the dc motor was following commands from my Raspberry Pi. Now I ...