Questions tagged [switches]

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

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1answer
68 views

Switch to control which way a current goes [closed]

I want an switch that directs a DC current to a circuit based on whether an I/O pin sends a voltage or not. What components do I need to make this switch? Here is the schematic:
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1answer
75 views

Can I sell and install homemade smart light switches legally?

I have designed and made prototypes for a smart light switch. It involves inserting a PCB into the work box behind the switch and is powered by the household AC. The goal was to sell these locally and ...
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1answer
65 views

body terminal of PMOS in transmission gate

Why is the body terminal of PMOS in the transmission gate connected to VDD instead of its source? Why do we deliberately introduce body effect here?
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4answers
356 views

Can I use a relay to control light switches?

I'm working on a project where I use a Raspberry Pi to build smart home devices. One of the devices I want to control is my room's light switch. I've done a bit of research and found out that my light ...
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4answers
48 views

Controlling a single lightbulb from multiple switches

It is quite common to have a single lightbulb in the home that has two switches to control it. It works so that whichever way the light is (on/off) you can change the state of either switch and it ...
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1answer
111 views

Coin cell to power a 5mm UV LED?

I am a beginner with LED lights, but would like to use a 5mm UV LED to make a pendant with a small fluorescent crystal. (This is what I purchased (https://www.amazon.com/uxcell-365-370nm-Ultraviolet-...
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1answer
44 views

Does the signal direction matter for a series N-channel FET switch circuit?

I'm working with a 40-year old audio circuit that someone modified to use an FET as a series switch. The circuit uses the Toshiba 2SK30A N-channel FET to pass a nominal ±1 VAC audio signal. The Source-...
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1answer
26 views

Is it possible to wire 2 short led strips with 6 pin (ON-OFF-ON) SPDT switch

Need help. Is it possible to wire 2 short led strips with 6 pin (ON-OFF-ON) SPDT switch in that way to have: A) One led strip - ON, second - OFF; B) Both strips - ON; Components: 6-PIN SPDT switch, 1 ...
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2answers
269 views

transmission gate structure

Why is transmission gate connected this way (source of NMOS connected with drain of PMOS, and source of PMOS connected with drain of NMOS)? Why don't we connect source of NMOS to source of PMOS and ...
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3answers
252 views

What's the best way to debounce a slider switch?

I'm really struggling with a VHDL implementation of a debouncing circuit for 2-position slider switches.I had initially planned to use an SR latch to do this but couldn't figure out how to make it ...
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4answers
81 views

Can a Buck converter operated at 200kHz be used to step down 230V DC input to 5V DC output?

I was wondering whether this type of converter is possible. Any clarification on it will be appreciated. Thanks.
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2answers
83 views

Mosfet reverse switch

I need default close button, but many smd-buttons is default open. How create mosfet-button? It is for LCD display backlight switch off. When button is pressed the output must be 0 volts or ...
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1answer
52 views

Manual override switch design with mosfet and DPTP

I want to design a bathroom light that automatically adjust color and brightness according to many factors (time of the day, people presence, mood, weather...) but I don't trust myself with ...
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4answers
203 views

What is the general criterion for selecting a MOSFET voltage and current rating?

I've used an N-Channel MOSFET (IRF540) rated at 100V 28A as a switch with a 54V load and current source that maxes out at 20A. The switch worked however, using the load for a while resulted in MOSFET ...
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5answers
135 views

Use momentary switch to switch between three devices

I need a solution to use one momentary switch to switch between modes on a pump. Off (NC) | Low | High. What I mean is you push the pushbutton once to turns pump on low, push it again for high and ...
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3answers
104 views

How to control the power to an LED strip using a micro switch? [closed]

I've never worked with electronics before so I want to be sure I do things correctly and safely. I have this LED strip which is powered by a 5V USB port. I would like to control the power to the strip ...
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0answers
29 views

Mute / blank an amplifier fast

I would like to build a circuit to mute an RF Class A amplifier to supress noise while I am not transmitting. I transmit ~20 us long pulses at ~1-5 MHz. In the time between the RF pulses, I would like ...
1
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1answer
116 views

Please explain MOSFET output characteristics and load line when used as a switch

My end goal is to switch a 9V-12V LED strip with an STM-microcontroller (3,3V level logic). So, I'm reading about MOSFETS (n-channel enhancement type in particular), but I'm very confused about the ...
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1answer
42 views

Two channel logical switch

I'm trying to make a theoretical automated battery charger using a reactor only with logical gates, and I wanted to use charge cycles between 30 and 80% for efficiency sake. I can output a 0 or a 1 ...
1
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1answer
77 views

How to constantly power an LED circuit normally controlled with a momentary switch?

So background: I have a novelty light up Disney Fantasia Sorcerer’s hat that I would like to use a a Christmas tree topper. The hat has an LED circuit built in with pulsating lights in various colors ...
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1answer
45 views

Best way to turn off P-FET with 3.3V available (P-FET Load Switch Application)?

honestly I'm drawing a blank. I am trying to turn on and off a load with a P-CH MOSFET. I used generic resistor values just to be clear. Now, in this example the VGS will clearly never go to 0. It ...
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3answers
61 views

Opto-coupler output photo-transistor as normal BJT

I am currently using a 4N49 opto for command isolation (no speed requirements, just isolation for a slow 64ms signal). There is different section of the design which also needs a NPN transistor switch....
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0answers
44 views

Single Light switch to turn on/off based on computer program running

Brand new here so please be gentle lol Im interested in creating a light switch that turns on/off based on whether a computer program is running (Mac for now). I'm not entirely sure what components I ...
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1answer
64 views

Multiple SPST relays in parallel for high switching power

I have a Pulse PLA900 AB amplifier and I would like to use a non-latching relay switch to switch it on/off from a digital platform. Unfortunately, the technical data sheet of the amplifier lacks ...
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0answers
65 views

How I can command the four switches without microcontroller

I try to command 2 SWitch H bridge rectifier (two mosfet two diode) during the positive half cycle M1 switching and M2 be considered as a secondary switch that is continuously ON. During the negative ...
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1answer
180 views

A push button switch before or after a PWM DC motor speed controller

What is the difference of putting a push button switch between a switching power supply and a PWM speed controller (dial on 100%) or it between PWM controller and a 12V DC motor (to turn it on and off ...
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0answers
32 views

How to connect a ENC28J60 or ENC424J600 to a KSZ8091 PHY and from PHY to an unmanged strapped configuration to a KSZ8863 or other switch

How would one go about connecting MAC chip to a PHY and then to a switch for dual ports for daisy chaining? Rather be a strapped configuration for use in unmanaged mode so no need for MCU software ...
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2answers
83 views

VAC ratings & VDC ratings from components [duplicate]

i've been looking at switches and have noticed a few of them only note their voltage / current ratings for AC but dont mention DC ratings at all. Is there a reason to this and if so is there a ...
3
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4answers
229 views

Switch logic circuit

I am trying to create a circuit but I don't know exactly which switch design or logic chip I would use to accomplish my goal. Here's the scenario: I have 6 pins, let's call them A, B and C and 1, 2 ...
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2answers
94 views

Can a DPDT switch be used in reverse so that it selects 2 of 4 inputs to go to the 2 outputs?

I mean title, but I’m trying to have it so that it will select 2 of the 4 inputs to connect to the 2 outputs.
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3answers
133 views

Circuit that can switch between Vcc and High-Z

I want to develop a switching circuit (for controlling power, rather than digitial signals) that is able to take an input and switch between Vcc and high impedance, rather than switching between Vcc ...
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1answer
82 views

HDMI color correction using Arduino or other device. Is this possible?

I have a laptop display that does not come with color correction software available. I'm currently using it as a monitor to play some PS4 games on it but there are some problems with colors. I ...
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1answer
50 views

Switchable bleeder resistor for very high voltages

I've got a very large capacitor which is likely to be storing up to 5 kV. When it is turned off, I want to be able to discharge it using a bleeder resistor (or similar) so I don't risk injuring myself....
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0answers
12 views

How to connect switches to PWB on IP69K sealed pannel without wiring harnesses while still allowing easy separation of board and panel?

I am working on a project that has a panel that has several push-buttons, and rocker-switches on it. The buttons/switches connect to a PWB that sits behind the panel. The buttons/switches/panel need ...
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0answers
48 views

How to connect a Microchip ENC28J60 to 3 port stand alone unmanaged switch chip with out using MCU

I have a working design running a Microchip PIC24 with TCP IP stack using the ENC28J60 chip. I am new to switching, and would like to add a second port for daisy chaining multiple devices without ...
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0answers
36 views

Multiplexing 3 phase motor driver signals to drive a BLDC motor bidirectionally

I have this unidirectional 3 phase motor driver powered by a 3S LiPo battery and want to make it be able to switch direction of the brushless motor connected to it within software. The way to reverse ...
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0answers
33 views

Switch Phases / Lines of EC-Motor

I am currently designing a test device for EC-motor drives. During the test I would like to 'switch' from one ECU to another so that the engine phases are switched to the other ECU. My question: What ...
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0answers
45 views

Using Parallel MOSFETs as a simultaneous switch

I have searched quite a while, but using parallel MOSFETs to alleviate thermal issues and dividing currents seemed to be the critical issues for lots of people. For me, I'm trying to use the parallel ...
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0answers
51 views

Trying to identify a component in a 12 volt LED on/off touch switch

I'm wondering if anyone can help me identify what this 8 pin IC is, in a capacitive on/off touch switch I have. It is a soic or 8-VSSOP package. 64RX-Y is written on the bottom of the IC, nothing on ...
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0answers
25 views

Finding a XT60 connector switch with indicator lights

I'm looking for an XT60 connector switch (e.g. https://www.amazon.com/gp/product/B07K33LRW2/r), but need one with an indicator light so I can visually verify whether a current is flowing through the ...
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1answer
80 views

IRF540N application issues

I am fairly new to using MOSFET's in circuits and I am a little stuck. I want to use the IRF540N as a switch, which will receive a voltage to the gate, and 18-30 volts at the drain. I would like for ...
3
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1answer
161 views

How to read MOSFET datasheet to determine when the MOSFET is fully on

I'm currently trying to find an N-channel MOSFET to act as a switch to be controlled by my Arduino, and I've come across two particular MOSFETS so far that seem like they would be a good fit to the ...
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1answer
80 views

Optimize Switch MOSFET AC

My aim is to create this using MOSFETs: Currently, I have this schematic: (I cannot to use TRIACs because I need to cut the AC line in the middle of cycle.) Question: So, I'm using 4 MOSFETs for '1 ...
2
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1answer
59 views

Automatic power switching, grounds not connected

I'm currently working on a project that requires a 24V DC input. That is no problem, as I have that power supply available. However, the project should also remain working when the supply fails or ...
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2answers
122 views

NEED HELP FAST connecting three-wire wiper motor to an AA battery holder

I'm new here and I had a problem that needs urgent attention. I have a three wired wiper motor that I want to get moving. I want to use my AA battery holder but the wires didn't work when I connected ...
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0answers
77 views

Controlling mosfet with a battery-powered attiny85

I have to control a MOSFET in switch mode. However, the whole circuit including AtTiny is powered by a LiPo battery. AFAIK AtTiny's output pin voltage is somewhere between 0.8*Vdd and Vdd and I'm ...
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0answers
29 views

400a Brushed DC Motor Switching Device

So I'm building what you might call an intentionally janky electric vehicle, and need some advice. In case anyone is wondering, the vehicle in question is a Ripstik - I currently have four of these ...
1
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1answer
58 views

Voltage is 0.05 when switch is closed

I am new to electronics. Iam designing a simple circuit where I have to make a digital switch: Here is what I have designed in Proteus: There are 2 issues: I want it to output 5V when I close the ...
5
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4answers
1k views

How do I determine whether a switch can handle the power/current in a circuit?

I have a switch that has "3A 250VAC" and "5A 125VAC" printed on it, which I imagine are ratings of what the switch can handle, but my understanding that 3A at 250V would be 750W ...
3
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0answers
37 views

frequency of MCP3008

I built BOOST CONVERTER, I sample the output voltage with A/D and control it using RASPBERRY Pi3, I set the switching frequency of the BOOST CONVERTER 70KHz, and the frequency of the MCP3008 1.35MHz, ...

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