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

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2
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0answers
31 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
28 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 ...
5
votes
3answers
387 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
47 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
27 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
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0answers
50 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
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1answer
24 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
56 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
402 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
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0answers
45 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
51 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
28 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
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1answer
35 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
45 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
33 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
588 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
113 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
46 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
34 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
45 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 ...
0
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0answers
20 views

Small profile 4 position switch/detented potentiometer? [closed]

Yes I've seen this similar question I'm looking for a 4 position switch/potentiometer (not rotary encoder) with about the same footprint as either a 9mm rotary potentiometer, or a 20mm slide ...
0
votes
3answers
109 views

Why does a closed circuit with a pull-up resistor output “0”?

I have a switch setup with a pull-up resistor. With the switch open I get a "1" or HIGH output and with the switch closed I get a "0" or LOW output. I understand why I am getting the "1" with it open ...
1
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2answers
47 views

Simple SPST Switch Circuit - Pull-down Resistor VS. Current Limiting Resistor

Super Noob EE question: Here is my quick draw-up of my SPST switch circuit schematic. I know I probably did not do this right, but if it gets the idea across, then thats good enough for me atm. ...
-1
votes
0answers
26 views

Switching on/off a RJ11 connection

I currently have an RJ11 connection between a master and a slave. I would like to "disconnect" and "connect" the connection every 30 seconds (without having any control over the master or slave). Any ...
0
votes
0answers
19 views

Light switch wiring problem [migrated]

I have 3 switches that control the same light. One of them broke, so i replaced it. I can't get the light to work now. I got what looked like the same kind of switch from the store. It's a 15amp/12 ...
1
vote
1answer
26 views

can I wire a ceiling fan to a 4 DP toggle switch?

I want to re-purpose a ceiling fan motor and would like to have each of the three speeds available on their own switch (or position on a toggle). Is this possible? and if so how should I go about ...
3
votes
3answers
360 views

How to read Slide Switch schematics?

I can't understand the schematics of the 20pin slide switch SS44D04. The schematics are in this pdf: http://www.lightcountry.com/download/slide/Slide%20Switch%20SS%20Series-11.pdf It is the first ...
3
votes
1answer
46 views

Positive to negative dial?

is there an electrical component that exists that would act similar to a potentiometer, but could be turned either clockwise or counterclockwise past a middle point, and would either release positive ...
1
vote
3answers
42 views

using a NOR gate output to a mosfet switch, improper high level output voltage

I am using a hex 2input NOR gate IC (TI SN74AS805BN). NOR Datasheet with a 5V regulated supply I want this to control a power mosfet switch Vishay FB180SA10B MOSFET Datasheet. The problem is that the ...
0
votes
2answers
35 views

Customizing Digital Thumbwheel Switches

Has anyone used a Thumbwheel Switch such as these: http://www.digikey.com/product-search/en?mpart=A7D-106-1&vendor=39 I am interested in changing the internal number strip. For examples I have ...
0
votes
2answers
76 views

BJT Switch with a Diode from Base to Emitter

In this circuit, the diode is supposed to force a higher input voltage to turn the LED on, however when I created it on a breadboard I measured about the same input voltage (without the diode) to turn ...
0
votes
1answer
74 views

Circuit for supporting, common anode AND cathode RGB LED Matrices

I'm designing a driver / controller board for 8x8 RGB LED Matrices that then can be daisy chained to e.g. make an 16x64 Matrix or so. So I came up with a couple of designs that I've tested and so ...
1
vote
2answers
55 views

Can i change 5 pins tact switch to 4 pins tact switch?

I have AOC brand monitor with a manuall buttons which operate the menu OSD. I would like to change the original tact switches(there are 5 tact switches) buttons in the circuit board.The problem is ...
0
votes
2answers
61 views

Turn circuit off when switch is on

I have a momentary switch that is usually on and I want my circuit to be off when the switch is letting the signal through, how would I do this?
1
vote
1answer
46 views

switch 12V with 12V ACC (car)

I'm currently trying to design a circuit for my car which will switch itself OFF or ON depending on +12V signal from ACC(accessory) cable. Car is providing me a +12V battery power, +12V accessory ...
2
votes
3answers
97 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
2answers
61 views

Voltage rating for switch with high voltage but very low current

I'm building a small circuit for measuring high(ish) voltages with an oscilloscope. It's based on an isolation amplifier that measures the voltage across a measurement resistor (r3 below), attenuated ...
0
votes
1answer
50 views

Voltage controlled gate?

Is this a thing? Say I have some sort of electrical component that takes two voltages as input, and acts as a switch. Until voltage 2 is greater than voltage 1, no current moves beyond the switch. ...
0
votes
2answers
67 views

Can't recognize circuit element in old clock mechanism

I am spending my free time thinking of how to make an old clock in my hometown working again. Here is a picture of the mechanism. I can't recognize the marked parts. Hope somebody of you can. In ...
0
votes
1answer
51 views

Turn off device when USB power is present

I have a device I'd like to turn off when power is available via a USB socket. The device that needs to be turned on/off is powered by a 12v DC 0.5 amp adapter. USB sockets should have a max 5v 0.5 ...
-1
votes
1answer
46 views

mosfet (n or p) as switch on vcc [duplicate]

In my case i am using the shematics in a truck, i have the ground everywere on the truck body. I would like to control a led strip using mosfet (N or P) as a pwm switch on VCC (transistor beetween ...
0
votes
1answer
64 views

Ultralow power reed switch signal reading with mcu

I'm a newbie in electronics. I need to build an ultra low power (nA) reed switch signal reading for an mcu. I'm using the following schematic diagram. The Vo output goes on a mcu input pin that is ...
-1
votes
2answers
70 views

Possible solutions instead of 12 relays

First of all i am new to electronics, but have some basic idea. I want to create a USB switcher with arduino, which will control "where" the usb device is plugged in, instead of unplugging and ...
0
votes
1answer
37 views

fast 5v High Side switch controlled bz 3.3v

For my led cube, I need to switch 5V (common anode layers) with 3.3v (pic32). This should happen at a high frequency. In recent builds I used pfets, but because I'm using 3.3v now, a pfet wouldn't ...
1
vote
1answer
85 views

Using a Contactor or Relay to switch between two DC power sources?

I want to power a motor with a battery, however the complication arises as I want to have two power sources and be able to switch between them. The context of this problem is for an electric vehicle. ...
1
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0answers
72 views

Need help to understand DigiKey/Mouser “Switch Function” terminology

I first read Switch Basics from Spark-Fun tutorial to help me better understand how to find what I am looking for using DigiKey/Mouser Advanced search terminology. I know I am looking for a ...
0
votes
1answer
83 views

Transistor switch logic, multiple lines

I have the following problem that I need your help solving. I have two digital input signals, let's call them D1 and D2, they are 0-5V, and max available current is 20 mA, and two output signals, ...
1
vote
1answer
72 views

1 switch for 4 circuits

I have 4 basic independent circuits, each circuit consists of 1 x AA battery, some wire, a micro switch and a light bulb. I would like to control them from a single switch. So that upon the first ...