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

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2answers
33 views

Physical push-down toggle button that pops up on voltage

I have encountered innumerable variations to functionally identical 2-lead physical switches, like the push-to-toggle buttons I am currently working with. Manually depressing the button toggles ...
0
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2answers
39 views

transistor toggles an LED, but not a solenoid valve

I'm working on a hobby project where I'm trying to drive a solenoid valve with an arduino (for some automated plant watering). The solenoid valve takes 12v, so I've rigged up some smaller batteries ...
0
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1answer
47 views

Is there a way to use a depletion mode MOSFET “inverse”?

I aquired some surplus led strips and I want to make a certain control circuit for it. I took another goal of using only the components I have laying around. I found a nice reclaimed power MOSFET to ...
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1answer
35 views

Permanent ON/OFF tactile switch [duplicate]

I am looking for a small tactile switch that works like: press once -> turn on, press again -> turn off I only found this model http://www.adafruit.com/products/1683 , but i am looking to buy ...
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3answers
73 views

What is the name of a component that combines a switch with a variable resistor?

I had some lights with a rotating switch that would turn them on/off, and then continuing to turn the switch would make them brighter. What sort of switch is this called? (it had a physical "click" to ...
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3answers
92 views

How to switch between two input lines based on a digital pulse

How can I switch between two inputs based on a digital signal. I would like to have the Input 1 connected to the Output for the duration of the pulse and Input 2 connected to Output when the signal ...
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2answers
33 views

What are the differences between mini, sub-mini, and ultra-mini switches

Apologies if this isn't the appropriate SE for this question. If not, any pointers to a more appropriate place would be appreciated. I'm looking to swap out some toggle switches on a R/C controller. ...
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2answers
52 views

MAX4544 in plain english

I was looking for a way to simulate a button pressing with an arduino in a black-box circuit I cannot modify (I have no GND), you can see it in my previous question and question. Then, reading this ...
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1answer
79 views

why emitter is connected to high level and collector to low level?

generally, in all switching circuit, emitter is connected to ground and collector is connected to high level. i am not getting why is it so? is there any special purpose?
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2answers
50 views

Connect 3 switches without dpdt switch

Is it even possible to do such a thing? I am trying to implement home automation at my home, and I have a bunch of these relays. I don't want to need to get dpdt ones, and they are expensive. P.S. I ...
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2answers
53 views

Can output current be higher than what the input source can provide

One basic question.Am controlling a group of LEDs (connected in series and parallel) through a MOSFET switch.The input voltage is provided by a battery @ 5V,2A rating. The total current consumption of ...
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0answers
98 views

Automatic shifting circuit

We are trying to simulate tachometer. So, we have a potentiometer to control the output. So when we turn the potentiometer, the output increases continuously from zero up to maximum level. What we ...
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2answers
72 views

Avoiding body diode conduction

I am trying to design a replacement for a 2:1 switch using FETs, which would be really easy if I didn't have to concern myself with the body diodes that are present on PMOS transistors. My scenario ...
0
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1answer
34 views

Pololu Pushbutton Power Switch

I am replacing my auxiliary light switch of my car. on the switch assembly, it has a positive, negative, and ground. I am replacing it with a pololu pushbutton power switch with an oem switch that is ...
1
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1answer
33 views

Reed Switch sizing [closed]

I have an ancient (1973) but quality garbage disposal. It needs a new reed switch. The sink strainer gets flipped over and replaced to turn the disposal unit on. No exterior switch. What size do I ...
1
vote
1answer
57 views

Final voltage of two parallel (switched) capacitors

I am trying to obtain a resistance-circuit equivalent to a switched-capacitor circuit. It is the first stage of a ladder filter. simulate this circuit – Schematic created using CircuitLab ...
0
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1answer
58 views

momentary to on/off switch for 12v

I got some oem switches and I want to mod them into light switches. Here is my situation: I would like to use the oem switch since it has illumination and button that matches the car.I have already ...
2
votes
2answers
214 views

Type of switch for AC power cord?

I have a power supply that has only screw terminals for its AC mains input. Currently I'm using a power cord from a computer that I cut the female end off of and attached fork terminals to (live, ...
0
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0answers
23 views

Analog relay in logisim

I am attempting to create a 4PDT relay in logisim to play with mechanical logic circuits. I am not sure if it is possible to simulate the analog connection of the relay, where signal can flow in ...
0
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1answer
34 views

Controlling external appliances with a microcontroller by replacing switch with relay

I am working on a custom school project where I want to control a coffee machine's power using a micro-controller. I have never worked with interfacing to external appliances like this before so ...
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1answer
40 views

How to use relay switch

I have a relay switch. Particularly, leone SC5-S-DC6V. I am a noob who wants to use this relay switch. And I don't know how to operate it. Can someone please help me? For now, I just want to use it ...
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0answers
38 views

Drawing a tactile switch in Altium

I apologize if this is a bit broad, but I'm struggling to use Altium Designer 14.3. I've got a tactile switch I need to arrange a few of them on my board with some pin headers and LED's. The switch ...
0
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3answers
40 views

Switch 15V source with a MOS by digital 0/5V (dc)

I'm trying to switch on and off some 15V devices from Arduino Uno digital ports (0/5V). Each port must control a group of resistive loads (lights) of a train model. There are about 10 groups of loads, ...
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1answer
59 views

Turning a torch on or off using a single mini-switch

I need a circuit to turn on and off a torch, as given in the figure. The circuit must turn the output on when I press the mini-switch once, and turn the output off when I press the mini-switch again. ...
3
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1answer
68 views

Push button switch terminology

I'm looking for a push button switch that when you press it, it is open and then when you press it again, it is closed. I believe this is called an "alternate action" push button switch. Is this ...
2
votes
2answers
57 views

Is a switches voltage and current rating a hard limit?

I have a need for a switch that can handle 28Vdc at about ~1A. The switches I would like to use have a rating of 24Vdc at 5A. I would think that the limit of switch is the power, so if we take a ...
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3answers
59 views

Series switches display

Hi, I would like to know the best way of turning on an LED for each switch that is opened. The switches are normally closed. The load is a motor. When any switch opens the motor turns off. But it is ...
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1answer
25 views

5v Electret microphone to PC mute switch pop help

I've got a PC microphone that fires off a loud pop when muted. Upon taking it apart it appears that its mute circuit is really simple and therein may lie the issue. I've combed this board for fixes ...
0
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1answer
53 views

light dependent 5V switch

I wired up this light dependent switch which works fine. when in daylight and covered. how can i make it work when the light source is dimmer? ie is it a case of changing 1 of the resistors?
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1answer
23 views

switch matrix with ring counter

Hello I am creating a little device, which has a total number of 30 tactile switches arranged in a matrix with 3 rows and 10 columns. My problem is, that I have only left 5 IO pins on my AVR ...
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0answers
49 views

How to keep the signals at the pins on a Arduino upon software restart

I have a Arduino board, connected to a relay. When the digital pin on the board is set to HIGH, the relay closes. If the digital pin is LOW, the relay opens. Now that from time to time, I will have ...
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1answer
57 views

How do I get multiple voltage lines from a single PSU output?

Suppose I have a regulated power supply that has +20V and -20V outputs, and an amplifier circuit that uses them. I also have a push-button (not momentary) power switch with an integrated LED which ...
0
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0answers
30 views

MCP23017 not causing interrupts using a normally open switch on power up

I'm working on a project where I am using two 4x4 button pads. I would need to use two MCP23017 for input interrupts to support the 32 buttons. I am using a Netduino and I'm coming across an issue ...
0
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1answer
67 views

Reducing transistor switching time with a resistor from base to a negative voltage

Connecting a resistor from the base of a transistor to ground/negative voltage (R in the first scheme below) helps reduce its switching time. I would like to know why and how does it help; what are ...
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6answers
299 views

MOSFET PWM switch jamming on - why?

The circuit presented here is sized to switch 100W at a minimum pulse width matching 250Hz. But actually it's currently only being asked to switch around 10-20W. The load is an array of LEDs. Q1 ...
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1answer
61 views

Changing the path of a signal through multiple transistors with a single-poled switch

I was wanting to construct a "fuzz" distortion guitar pedal, but being indecisive, I wanted to be able to change the type of transistors in the circuit at will. I found the idea of using a ...
0
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2answers
49 views

Using 3 Channel Video Switcher Module with Arduino

Hey all I am wondering how to go about switch from camera 1, 2 or 3 using this 3 Channel Video Switcher Module on ebay here. Since there's only V+, V- and signal for the "switch" it looks to take a ...
2
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2answers
48 views

Question regarding SPDT switch

I'm looking for a particular type of mini SPDT switch, it has 3 poles (if memory serves correct, could be 2 pole) and has 3 total positions. By default it's centered and is set to an off state. If ...
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3answers
65 views

Can I use a switch rated as 250VAC 25A to switch 50VDC 25A?

I am looking for a switch that can handle 25A continous current, the voltage will be maximum 50VDC, most often about 46VDC, and it will be used to switch on two dc-dc converters that have no load ...
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3answers
173 views

Using a P-channel MOSFET as an on/off switch

The project I want to build is shown below. I want to operate the P-channel mosfet on and off with variable frequency from 20-100Hz and I choose P-channel to do this so that the +350V will not be ...
0
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3answers
122 views

Audio Signal Switching - “DPDT switch vs. 4066”

I've got a signal coming from an electric guitar and I need to switch it. Basically it's a distortion circuit. I need to switch between the distortion and clean (directly connected to the output) My ...
0
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1answer
36 views

Replace LED by a Trasmitter

I need a wireless switch with capability to report current state, so I would like to modify a wireless switche like this, by replacing a current state LED by a trasmitter to get the state of current ...
0
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1answer
51 views

Can you use a SPST to turn on and off two power sources?

I have several batteries in series and the ground point is in the center, such that I can achieve a negative and positive voltage. The OP amp uses both negative and positive voltage. Let's assume I am ...
1
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1answer
75 views

Wiring an IC for VGA switcher

Original schematic: Here is the goal switch between two VGA outputs from one source VGA input. Parts list: 1 SPDT switch for switching between A or B video outputs. 2 CBT3244AD IC chips (here's ...
1
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1answer
90 views

Can one be electrocuted when cleaning a light switch? [closed]

Light switches are allegedly some of the dirtiest spots in a house, and cleaning them is recommended in many articles. However the safety angle doesn't seem to get coevered. The only thing I could ...
0
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2answers
55 views

Switch not working as expected

I have what I think to be a DPST switch. My problem is when I plug it into my circuit, it seems to be closed regardless of whether I press it or not. I have tested with another of the same type of ...
0
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0answers
34 views

Power management in battery-based Arduino

I have an Arduino-based project which uses external sensors, communication chips, and displays. While I can place the Arduino into a low-power mode, this does not change the power consumption of the ...
0
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1answer
66 views

Use Arduino for switch a 12v powered remote control

I've a remote control powered by a 12v battery. I need to switch a button using arduino, can I use directly the digital pin without any relay or transistor? Thanks in advance
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2answers
139 views

MOSFET source to drain Current

Similar kinds of questions have been asked before it but they don't clarify how one can use this aspect in circuit. I'm aware that a MOSFET is a bidirectional device and in one direction current can ...
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2answers
52 views

Trying to identify this rocker switch in a KRK speaker

I am trying to replace a broken (the rocker arm was pushed in) rocker switch on a KRK V4 speaker, and am looking for a suitable part number. I don't see a number on the switch and don't want to take ...