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

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5
votes
4answers
998 views

What is a push-up/pull-up resistor?

The only thing in EE I know perfectly is Ohm's law, but learning eagerly. So pardon my ignorance. I am reading a book on Arduino & I just do not understand the concept of push-up resistor, ...
0
votes
1answer
36 views

Control connectivity of resistors in voltage divider arrangement

I am building a device to measure the resistance of a resistor using a voltage divider. I added multiple resistors so that the range of the divider could be changed by switching to another ...
0
votes
2answers
21 views

25V for PMOS switch VGS?

In a load supply using P-MOS, the input to source is 25V. We found unfortunately that the MOSFET we chose and soldered has only 20V maximum gate-source voltage. Although there are voltage dividers ...
2
votes
2answers
56 views

2 LED Parallel circuit help?

I need to make a circuit with 2 leds, 1 green 1 red. If the current flows, green led will light up, if there is a break in the circuit (open circuit) it will light up another led as red. I don't ...
0
votes
2answers
35 views

Alternating between two LEDS using BJTs and SPST Switch

I made a circuit based on this post, Alternating between two LEDS using BJTs. It seems to work in the simulation just fine but when I'm connecting it with real components, I get funny behavior. ...
0
votes
2answers
33 views

Momentary to Toggle Switch for Tiny Application

I need to put a circuit into a pen to turn on and off an LED using 3 AG3 or LR41 batteries connected in series. The LED will be on the tip of the pen and the switch will be on the side surface of the ...
1
vote
1answer
53 views

How can a remote-controlled (wall) light switch operate without a power source?

A few days ago, i bought this remote-conrolled light switch. When installing it, i wondered why i had only two lines to connect (the one going to AC power and the one to the lamp); i thought i needed ...
0
votes
2answers
50 views

What do you call a rotary switch that does not have a max turn degree?

Exactly like on the Logitech G35 or Logitech F540; not a rotary switch because those have notches and a physical limit. Instead of turning clockwise, or counter-clockwise, you rotate it 'up' or ...
1
vote
0answers
35 views

Convert a NO push button into an On/Off button

I'm building a boombox, and it needs a couple of switches for main on/off, voltmeter on/off and LED lights on/off. Since I don't have any metalworking tools I am going to buy a premade front panel, ...
0
votes
0answers
39 views

Switch based on battery voltages

I have two batteries. I would like a circuit which looks at their voltage, and puts them in parallel if they are the same. If they are not the same, the one with the higher voltage should be taken out ...
0
votes
0answers
25 views

Non physical hardware switch [migrated]

My laptop comes equipped with a hardware switch on its backside that connects/disconnects the battery. When I am connected to AC for example, I can thus avoid overcharging the battery. Yesterday ...
0
votes
0answers
19 views

Help understanding and building a switch circuit with the CD4066B

I am wanting to use a 4066 chip to control current flow through a circuit. (data sheet for the chip - http://www.ti.com/lit/ds/symlink/cd4066b.pdf) I will be inputting 3.3v into the control pins as I ...
1
vote
1answer
92 views

Shut off circuit when under a certain voltage?

I have three batteries wired in series, in order to produce 9v. If one of those batteries dies, I need the whole circuit to shut off. The best solution I've found is to use a comparator, but the ...
0
votes
0answers
13 views

Does a switch's Utilization Category AC-15 include a desktop PC?

For reasons beyond explanation, I'm trying to source an industrial limit switch to control the power to a desktop PC. It's run on a switch mode standard computer PSU. Most of the limit switches I've ...
0
votes
0answers
25 views

What on / off switch to use from a 2S Lipo to a Switching Regulator

Last time i used the Slide Switch for my application, everything worked well. The system has 2S (7.4v Lipo) Battery - Fuse - On/Off Switch - Switching Regulator - load ( Beaglebone + Wifi Module). ...
1
vote
0answers
23 views

3 way dimmer installation

I'm installing a three way dimmer on a 3 switches line for a light. In the dimmer notes the installation is done by replacing the three way switch on the load side. Can I replace the one at the line ...
0
votes
0answers
18 views

Solenoid Circuit: MOSFET switch help

I am trying to operate a 5V solenoid using a IRLZ44N power MOSFET. My problem is I cannot get the MOSFET switch to work. My circuit: 5V into solenoid and diode (1n4004) in parallel into the drain of ...
3
votes
1answer
98 views

Using a MOSFET to switch a High Voltage on a Capacitive Load

I am trying to bias the filament of an electron gun to -575 V, but I need to switch it on and off using a TTL signal. I have an idea for how to do it, but I would like to know if it will work before I ...
0
votes
0answers
21 views

Creating a pulse when the circuit opened and closed [duplicate]

I would like to send wake up and halt signal to a linux board. I just want simulate the power button on the board so I will replace it with a circuit. So: When I the car's ignition line is on it has ...
0
votes
0answers
27 views

PCIe switch connection

I have designed a board with a SoC (I.MX6) and a PCIe switch (PEX8605), everthing it's working in the board exept the PCIe switch, we can't even recognise it with lspci, dmesg..., so I wanna check if ...
5
votes
1answer
521 views

Rubber push-button

On lots of electronic devices, such as this Korg drummachine/sampler, there are some soft rubber push buttons. What are they called? (I'm looking for the most common name, so I'll can find them ...
1
vote
1answer
71 views

Request for guidance on sources to help me figure out how to do simple thing

I have 9 3w leds (white) and 2 1w leds (blue). I have one led driver with sufficient output to drive only the white leds (either in series or parallel.) Therefore, I figured I will get a separate ...
1
vote
2answers
79 views

When and how is a protective diode applied to the collector of a transistor switch?

I'm confused about a passage in "The Art Of Electronics", by Horowitz & Hill, regarding protective diodes in transistor switches: ...
3
votes
2answers
58 views

How can I protect a DC switch from arcing and sparks?

I have a DC switch that is being used as the main power switch for an audio amplifier project I am working on. The schematic is shown below. (a few things are wrong with that circuit, but have since ...
1
vote
0answers
21 views

Design of PWM controller for Wound Rotor Induction Motor

I want to make a controller for Wound Rotor Induction Motor in which effective external resistance on rotor side is varied by changing the duty cycle(PWM controller) with the help of a chopper.What ...
0
votes
2answers
41 views

Integrated TTL in SPDT-switch

Found a switch for a project, and want to make sure I understand it correctly. This is the switch: (Mini-Circuits SWMA-2-50DR+). Now, it has a TTL driver circuit with the inputs +5V, -5V, and TTL ...
0
votes
0answers
27 views

Using the thermal expansion as the driving mechanism for an analog switch

I'm not sure if this is the right place for this question or if physics might be better suited... I've been trying to solve for an analog switch engaging when an element reaches a temperature of ...
1
vote
1answer
41 views

How do I make this bidirectional switch work with inductive and capacitive loads?

I designed the bidirectional switch seen below. But right after, I realized that it would only work with resistive loads. However I want this to be a general purpose product, which will also control ...
2
votes
0answers
79 views

Switch between power supplies with a mofset

i'm new here and my knowledge in electronics is basic, so what i'm trying to do is to switch between two power sources, one at 5V an other at 12V, i already made a circuit that kinda works, but i have ...
0
votes
1answer
44 views

Beginner: Difference between safety resistor between pin and switch, or switch and ground

I'm making a little test board with a switch that intend to plug into a popular southern European microcontroller system. Obviously, it's intended to plug into a pin which is configured for input, but ...
11
votes
4answers
1k views

How to best attach a wire to a switch without soldering?

I've got a switch like this one: Now my (quite novice) question is: How do I best attach a wire to the connector without soldering, e.g. for quickly trying something out? Right now I've folded the ...
0
votes
1answer
53 views

Do potentiometers exist that include DPDT switches at the limits?

Do potentiometer packages exist that include 2 double-pole double-throw switches, one of which is switched at the lower limit, the other switched at the upper limit? (Preferably with tactile clicks.) ...
0
votes
1answer
38 views

please help me choose power mosfet for multilevel inverter

I am doing my senior project on cascaded multilevel inverter. I am planning to use MOSFETs as switches in my project.Please kindly give me instructions and respective formulas for getting right ...
0
votes
0answers
52 views

Best way to add capacitance to LC circuit?

I'm trying to simplify the way I ask things around here. How would I make the switches digital and controllable with an Arduino? The circuit is running at 170VAC @ 150kHz.
0
votes
1answer
27 views

flow power around button laser module circuit

I have a red laser pen module: http://space-linker.com/Uploadfiles/UploadFile/2010178127739.jpg I want to be able to have it always on. How can I short the button, without having to glue or tape it ...
2
votes
1answer
69 views

Must this switch be turned on and off periodically?

Imagine that the AC1-2 is 170VAC at 150kHz~. I simply want to turn the MOSFETs on, and let the AC flow through a inductive-capacitive load. 1) If I can turn the MOSFETs on to saturation by ...
1
vote
3answers
410 views

Is this a reasonable way to switch a circuit on and off?

I'm using optical slotted switches to detect the position of a wheel. I may have a dozen or so, and at any given time I only need to have one switched on. The device might be battery powered, so I ...
0
votes
0answers
50 views

How to design circuit for robot motor

How to design a circuit which fulfill the requirement below. I am a chemical engineering student which do no have any electrical knowledge but still need to design a circuit for my project. Motor ...
-5
votes
0answers
52 views

very short range wireless on/off switch [duplicate]

I am in need of suggestions for a wireless on/off switch for my project. I will be using it to trigger an LED and or a sounded alert but am struggling to find one that meets my requirements; It ...
0
votes
0answers
30 views

Explain to me how values are read with pullup resistors [duplicate]

In the above picutre, it seems to me as if when the switch is open, a voltage of VCC is on the input pin (i.e., voltage comes in through the resistor, to the input pin then back to GND through the ...
1
vote
1answer
44 views

Bootstrapping a bidirectional MOSFET switch?

is it necessary to use a driver and bootstrap circuit in order to make this configuration work; Or can I just stick 10V in it like shown? This is to make a bidirectional switch, I'm not pulsing ...
-4
votes
0answers
50 views

transmitter and receiver switch

I need to build a wireless switch (preferably RF) for a LED and possibly trigger a sounded alert using a transmitter and receiver pair and it needs to have a range with a strict maximum of 2 meters. ...
0
votes
0answers
36 views

Switching 150kHz mains for an LC load

I'd like some input on whether or not to use a mechanical relay or some form of SCR setup to change the capacitance in my LC circuit that is currently operating at around 170V, 1A at 150kHz. (Not ...
0
votes
1answer
39 views

Circuit with 2 reed switches (proximity sensors) output to single GPIO

I would like to use 2 magnetic proximity sensors (normally open reed switches) to determine the position of a chicken door (vertical sliding door) which in turn controls a motor. If the door comes ...
4
votes
2answers
602 views

What do you call a pair of SPDT switches controlled by one toggle?

I need a toggle switch which allows me to switch the poles of two separate single-pole-double-throw switches together. It would work like the diagram below. Note that the dotted line represents a ...
3
votes
2answers
126 views

How to switch a Bluetooth module with a P-Channel MOSFET high-side switch?

I am looking for a high side switch to turn a Bluetooth module off when not in use. The module uses 100mA at most and runs on 3.3V. I am using a ATMega328 to talk to the module and it runs at 5V. ...
1
vote
1answer
49 views

How switch 20A AC between 2 wires

I'm trying to translate a circuit I made from breadboard to PCB and need some help finding out what components I should be looking for. Basically, so far I have a very simple circuit running 12V AC, ...
0
votes
1answer
51 views

Dimmer Switch For A NeoPixel Ring

I purchased a set of 4 NeoPixel ring segments and assembled them into a circle. I am trying to create a circular lamp that will be fitted inside a camper van in the ceiling and driven from a 12V ...
-2
votes
1answer
26 views

Order of Power Settings on Switches [closed]

For small appliances like hair dryers and space heaters, why do some switches go from off to high to low and others go from off to low to high, which makes more sense to me?
0
votes
3answers
53 views

Switch current rating AC vs DC

I'm looking for a high current DC switch (able to switch something like 5V@30A) and I've encountered several DPDT that might do what I need, however they are only rated for AC applications (3A@250VAC ...