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

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36 views

Three point usb switching

I'm designing a device that have will play mp3 files either from an internal usb flash drive (not physically accessible to end user) or from an usb flash drive plugged on an external usb port Also, ...
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2answers
62 views

How to switch between two DC power sources powering a motor on an electric vehicle?

Background: For a university final project, my student group is investigating the possiblility of powering a motorcycle with two seperate batteries, each of a different chemistry (Lead-acid and ...
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1answer
36 views

Current Activated Diode Switch

Ok so here's my situation. I have a custom board with a micro controller that has a 6 pin connector. If I plug in a device to the connector that requires power it should provide somewhere on the ...
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1answer
23 views

Igbt for AC 32A switch

I have been around this forum, and I am not sure I found my answer. I would like to realize a small and cheap AC switch. Relays being too big, I got interested in IGBT. The goal is to turn on and off ...
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1answer
52 views

2 key keyboard, need some basic information. [on hold]

I was just wondering how I would go about making a 2 key keyboard that simply inputs z and x. That's all. What supplies would I need? I also want the polling rate to be around 1000mhz for minimal ...
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3answers
98 views

NPN “Saturation” Mode and switching

So, one thing I've been reading about is Sparkfun's tutorial on transistors,focusing on BJT (specifically NPN, but a bit into PNP). I'm super new to transistors and such, so please bear with me. ...
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1answer
37 views

Power MUX for USB and AC adapter

I have a handheld, Li-ion battery powered project involving dual path power input (USB and AC). Initially, the circuit is wired like this: It wasn't before long I found the problem when both USB ...
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1answer
87 views

NPN switch: What is wrong with this circuit?

I'm trying to use a single source for both output and an NPN switch (5V - 2Amp). I cannot get higher than 500mA at the output, with VLoad about 4.3 V max. simulate this circuit – ...
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0answers
67 views

How can I speed up reading [closed]

I am working on a project using an Arduino as a web server. Code: ...
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0answers
10 views

Replacing dumb wall switch with smart one (wiring) [migrated]

Based on the first diagram below (which is the current wiring for my wall switch), is the way I have the second diagram set up correct? My biggest point of confusion is the line/load wires. Judging by ...
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0answers
34 views

Using capacitors to control the speed of a relay loop

Background: In my autoshop class at school we are required to make a circuit that uses relays. When one relay comes on the other one shuts off and it creates a loop in which they switch really ...
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1answer
25 views

Select power supply voltage using MOSFETs

I have a circuit which I wish to power using 5V or 1.8V or power off entirely. For a simpler version, switching one voltage, I decided to use a P-channel mosfet as a high-side switch (see the left ...
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2answers
43 views

DC Motor reversing relays using a micro switch [closed]

I'm looking to use relays and 1 micro switch to reverse the polarity of the circuit. I will need a simple ON/OFF switch to have the motor turning in one direction and then when the micro switch is ...
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1answer
54 views

4066N analogue switch rapidly switching ON/OFF when should be OFF

I have the following circuit that should light up two LEDs at the exact same time: (Edit: Removed incorrect 1.64V enable input because, though I now understand it's on the low side, it is not a part ...
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0answers
39 views

Shutters switch connection

I have shutters switch like on the figure below But there is another one wire connected to the point (N) in my case. Anybody knows why we need it? To my opinion we do not need it at all. From the ...
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1answer
31 views

Circuit with reversing polarity and two microswitches

I am building a time-lapse camera slider with the following components 2rpm DC gearbox motor PWM with reversible DPDT switch to reverse motor 2 SPST Microswitches I am trying to wire the ...
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2answers
93 views

How does this electronic wall switch work with only a 2 wire circuit.

This is an RF wall switch but it uses only LIVE + LOAD1 cables like in the wall lamp switch (2 wires wall switch, load and live) If you short LIVE and LOAD the lamp turns on LIVE ...
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2answers
82 views

Replacing a switch with MOSFETs

I currently have a 2:1 switch / multiplexer which is being used to switch between two different batteries which are to provide power to a small module on my board. The switch that I am using is the ...
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1answer
63 views

Fast Switching For UPS

Well I don't even know how to call this question, but the point is. I am making a DC UPS, and I want to be able to quickly switch from the wall supply to the battery supply, and I don't think a relay ...
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4answers
301 views

Switching resistances in op-amp amplifier

I am building an inverting amplifier with an op-amp to attenuate a signal (ie: gain < 1) and I would like to be able to change the gain electronically by connecting multiple resistors to a switch ...
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2answers
46 views

SSR with low-flow switch to control heater

I'm trying to install a low-flow switch (circuit is open below 0.1 gal/min, closed above that) as a safety measure on an immersion heater, but I have some questions about the setup I've come up with ...
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2answers
85 views

Design of a Five Second Kill Switch

I think I have a challenge for you smart souls on here, who donate your time by answering all of my terrible questions. I have to design a switch that completely shuts off a system when it is ...
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1answer
61 views

Battery Discharge

I am making a circuit to discharge an 18V Li-ion battery, with multiple cells, in order to condition it. Each 18V cell has a capacity of 100Wh when fully charged. I would like to control the condition ...
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1answer
37 views

Router power switch with bluetooth hands-free

I want to make a bluetooth switch for my wireless router so I can restart it via my phone. I have an old bluetooth hands-free so I'm wondering if it could be used as a power switch. I'm planing to ...
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2answers
54 views

switch that closes when power is on

I'm currently working on a project that makes a device "IoT-ready". So im looking for a switch, which got two inputs and two outputs. When I close the circuit on the one side, it should close it on ...
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3answers
93 views

Make a Latching Relay using SPDT Relays

I want to make circuit which can working like a Latching Relay which Hold Current using SPDT Relays. So i can use this circuit to Pules ON/OFF switch. Using limit switch when pressed a pulse goes ...
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1answer
51 views

CMOS technology, use a NMOS or PMOS as series switch?

A general question regarding switches in CMOS. Have a look at the schematic below (symplified current mirror) There is a input reference current, on/off switch, a PMOS mirror and the resulting ...
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2answers
169 views

What does a parenthesized current rating on a switch mean?

I'm speccing out some switches for a project... is this some standard notation I've never seen before? Electrical Ratings: 12(4)A 250V AC What does the ...
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1answer
56 views

Switch to power pump with relay [closed]

I couldn't find this question anywhere else. I have a pump, a 12v battery and a switch and can purchase any relays etc that may be required. I want it so that when a switch is triggered and kept on ...
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1answer
55 views

Electronic pressure “switch” [closed]

I need to gradually switch (ON-OFF or OFF-ON) the output of an 8 bar air compressor by using a uController. I don't want to turn on/off the compressor itself. Can You help me to identify such a ...
0
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1answer
48 views

FM receiver used to control a switch

I am new to this and I would like to ask for advice on FM receivers. I want to create a very low powered (mass produced) item that has a super bright LED, battery and then related circuitry(for FM). ...
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3answers
228 views

Change Direction of 12v DC Motor Rotation using Relay

I want to make a circuit to change 12 Volt DC Motor direction and move some thing between two points. Using Relay or some basic limit switches.Like this Image. I got a Circuit As i want... AUTOMATIC ...
4
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2answers
246 views

Can I do this (MOSFET instead of switch)?

This might be a very trivial question: Can I simple swap a switch that is connected to a RESET pin with internal pull-up with a N-channel MOSFET? My goal is to pull the RESET to ground using a ...
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1answer
47 views

How do I wire my 4066N analogue switch

I plan to use one of these to throw two switches at the same time: http://www.digikey.ca/product-detail/en/74HCT4066N,112/568-7854-5-ND/1230913 The switches should be closed when the voltage from ...
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2answers
238 views

Transistors to switch 12V 2A

I need to switch some power to a device, so I was wondering, if this will work OK, or do I need to add some other stuff to protect it, or make it work correctly. I ran some simulations, on ...
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0answers
52 views

automotive positive negative and ground and switch connection

I am wiring auxiliary light. I want to use my oem switch (momentary) and replace the included push button. I've blew a few fuses, so it's probably better to ask here before I blew up more stuff. I ...
2
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2answers
67 views

Rotary Switch terminology

I am buying a rotary switch, and I have found these terms: 2 x Off/(On) and 2 x Off/On Could you please explain me the ...
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2answers
46 views

A relay for each terminal (live and neutral)

I'm investigating a control circuit that switches a heating element. From what I can see there is a relay on both the neutral and live to the heater. The relays are controlled together and cannot ...
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1answer
37 views

Digital Output Control over ECU discrete inputs

I am looking for a better solution or method for controlling the discrete inputs to an ECU using a simulator and signal conditioning. The discrete input signals from the ECU provide an output of 15V ...
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2answers
44 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 ...
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2answers
60 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
62 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 ...
0
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1answer
40 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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votes
3answers
81 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
146 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 ...
0
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2answers
63 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. ...
0
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2answers
54 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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2answers
135 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
62 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
62 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 ...