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

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17 views

Switching cold cathode fluorescent lights on and off without relay?

I have a few sets of 2-in-1 CCFLs that are designed to be powered off the 12V rail of a computer PSU. I'm planning to build a large 7-seg display using them so I'd like to be able to switch them on ...
1
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1answer
40 views

Digital equivalent of a double-throw switch?

I'm designing a circuit that would switch between stereo-jack inputs. Source audio would be plugged into one end, and on the other two ends, two different audio outputs. I want to be able to switch ...
0
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3answers
59 views

Circuit for a DC motor with 2 microswitches reversing direction

So here is what I am trying to do... have a DC motor wired to an on/off switch and 2 microswitches. Each switch will reverse the direction of the motor, so one switch tells the motor to go forward, ...
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2answers
62 views

Off Resistance of Analog Switch 4066 pretty low?

I am trying to use an analog switch to switch signals between my end nodes. Before I tried in actual circuit, I wanted to try it in a test circuit. As, 4066 can act as a switch for both Analog and ...
0
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0answers
41 views

Jumper for power supply selection and DIP switch for SPI selection

Actually I am designing the connection between one master board and many other slave boards. The power supply of the slave boards will be either given from the master board or powered via a battery ...
0
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3answers
84 views

convert USB to RCA phone plug in order to close a switch

I would like to know if it is possible to convert a USB signal to a RCA phone plug signal in order to close a switch contact. There are pushbutton switches that can remotely close a switch by means ...
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0answers
43 views

Power dissipation

Pointing to the third diagram, when vi is high, what is the drawback(the book says, power dissipation occurs even if the inverter is not switching) of this switch? what is the effect of Voffset here? ...
2
votes
3answers
186 views

Four-contact push-button switch; what's the pictured switch called?

I have single phase submersible pump, around 400 foot underground in a Bore-well and its controlled by the controller shown below. The green button is a push-button switch which if pushed and held ...
1
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1answer
51 views

Leakage from MOSFET Switch To Ground

I built this circuit at home to for science (I explicitly drew the body diodes for clarity). simulate this circuit – Schematic created using CircuitLab Imagine the following scenario: ...
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1answer
63 views

LED on open circuit [closed]

This circuit is not working where the transistor value is BC556B. Any ideas?
0
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1answer
68 views

how to cut off power from usb device using arduino

Seems like I can't restart USB modem in Linux, so I setup an arduino gig to emulate usb modem plug/unplug. I have Arduino Uno R3 and several N-channel mosfet https://www.sparkfun.com/products/10213, ...
0
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1answer
49 views

LiPo Battery: series to parallel charging switching circuit

simulate this circuit – Schematic created using CircuitLab So, I have two 2000 mAh LiPo batteries that are going to be powering a GSM modem (on an arduino shield) a GPS and a motor. I ...
0
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0answers
82 views

How to disable a button after power on

Is it possible to prevent button from working when another circuit is on and if it is, then how? To be more specific I'll try to describe what I'm trying to achieve. Basically there's two independent ...
2
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0answers
30 views

switch with built in solenoid [duplicate]

I am trying to source some toggle switches that also have a built in solenoid and can effectively toggle themselves. Like what they sometimes have on sound mixer boards for automation. Basically a ...
0
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2answers
37 views

Automatic DC 3 line switch

please help me with an advice. I need a dc switch, but the switch should work from electricity. For example: 2 in lines and 1 out line. One in line is 9 volts and out line is 9 volts, but the second ...
0
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2answers
73 views

How to make a push-to-break circuit

So, I can get push-to-break switches that will break my circuit when pushed in. I assume this is how the light in my fridge works. But how do these works? I would like to make something like this, ...
0
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2answers
65 views

Switching current source ~1 μA — how to switch off quickly?

I would like to have a precision current source ~1 μA loaded by a resistor ~100k and a voltage source. Also I would like to switch on and off the current. The problem is that when the transistor ...
0
votes
1answer
106 views

How to short a push button switch to be always on

I have a little bluetooth FM transmitter that uses a single button that you press and hold to turn the device on, press and hold to turn the device off, and press once to change the FM station it ...
0
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0answers
32 views

Non invasive voltage detecion (AC 230V 50Hz) Galvanic isolated

I am putting together a PLC (Siemens Logo o Simatic) that will monitor a control line that supplies signal voltage (230V 50Hz) to a industrial sized heating unit (GAS). The control line has in series ...
0
votes
1answer
47 views

micro switch sensitive to impact

I am looking for a very small switch that will switch on then off in response to a single impact. Physical size about 4mm cube but smaller if possible. It is for a project to make a training aid for ...
0
votes
1answer
43 views

Switching Between an Analog Sensor and a Digital Sensor

I am working on a project that reads sensor data from multiple sensors. I am trying to come up with a universal solution for connecting these sensors, and have decided to go with a 4P4C Modular Jack ...
2
votes
5answers
184 views

Override digital out with pushbutton

I have an Arduino Digital Out pin connected to a 1k resistor, then connected the base of a 2N3904 transitor. In fact, that same digital out is connected to several resistor->base-of-2n3904. Each ...
2
votes
1answer
43 views

load switch capacitance constraint

Considering using a Load Switch like DigiKey FDC6330LDKR-ND for powering on and off a device at the far end of a cable. The voltage and current requirements are well within spec however load ...
1
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1answer
38 views

Rotary Cam Switch wiring help

I am trying to wire this rotary cam switch to spin a DC motor forward and backwards based on the UP and DOWN setting. I am having a really hard time trying to figure out how to wire it. Can someone ...
5
votes
4answers
546 views

How can I slow down the switch time of a MOSFET?

I have an NMOS that is switching too fast for my application. Into the gate I am sending a logic-level square wave (PWM). Unfortunately for me, as expected, the output is also a near square wave. How ...
1
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1answer
87 views

Is it possible to get input from a 10x10 grid of switches using an arduino board? (Uno, Mega, etc.)

I'm more of a software guy but I'm working on a prototype of a game that will use a pressure sensitive 10 by 10 grid. This will require 100 switches just for the grid. The closest I've found to off ...
0
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1answer
102 views

Simulating SMPS with ideal switch in LTSpice?

Yes, this in a portion of a homework assignment (hence the idealized and slightly asinine problem statement). Aside from solving the circuit (which I have done), I am supposed to simulate the ...
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0answers
88 views

Simplest possible hardware debounce

I'm building a 737 EFIS panel and I'm looking on some input on my debouncing circuit. I wanted something simple (So no Shcmitt stuff) but still done in hardware because i want to use interrupts for ...
0
votes
1answer
50 views

What kind of toggle switch do I need?

I'm building this circuit: I'll be use a 12v DC power supply (same as pictured), but with a 220uF electrolytic capacitor because of the 400 ohm 12v relay I'll be using (instead of 220 ohm). But ...
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0answers
29 views

SPDT Switch in Logisim

How do I implement an SPDT switch in Logisim? I need it for connecting 2 pins to ground but not at the same time.
1
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1answer
78 views

What is this Circuit's function? Does it involve Isolation?

My question is: Does this circuit isolate the "X Volts" lines from ground (1) If not, how should I implement an opto-coupler to provide isolation between the data lines ("X Volts") and ground? ...
0
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1answer
110 views

Simple transistor for switching a computer power supply

I am teaching myself about simple transistor circuit design and have been stumped by the simplest transistor behaviours. The task I have set is to use a transistor to switch on an ATX computer power ...
1
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1answer
57 views

VGA switch 3 in 1 out [closed]

My team and I are going on a software development competition in 1 week. We will demonstrate the software on multiple laptops, but we have only one projector. So we need to be quickly able to switch ...
1
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1answer
96 views

How to use “Voltage controlled switch” in OrCAD?

In this OrCAD project, I tried to build really basic DC-DC Converter with use of "S" or "SBreak" parts in OrCAD's Analog Library. But, According to analysis (picture below), the blue DC line should ...
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0answers
22 views

DG202BJ IC Voltage changes

I am using a DG202BJ IC. http://www.vishay.com/docs/70037/dg201b.pdf I connected pin 5, 6, 7, 8 to ground. V+ = +10 and V- = -10 IN1 = IN2 = IN3 = +5V; S1 = S2 = S3 = -5V When I check the output ...
0
votes
3answers
89 views

How to ADD resistance with a push-button (Schematic Incl.)

Edit: New schematic, my apologies. Background: The circuit below shows a potentiometer "R1", which is not used until the normally open push-button "S1" is pressed. The second resistor "R2" is not ...
1
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3answers
40 views

Is the battery being drained?

I'm building a simple intrusion alarm system with a piezo buzzer fed by a 9V battery, I have a switch to activate/deactivate the alarm, and a trigger (like a switch) connected to a tripwire so if ...
1
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3answers
176 views

Using two switches to light/turn off consecutive LEDs

I am trying to create a circuit that controls 10 LEDs with two momentary switches. Let's call one button ButtonUp and the other ButtonDown. When I press ButtonUp, the first LED lights up. If I hit ...
0
votes
0answers
76 views

Parasitic inductance causing large current spike

I'm studying the performance of electrodes in methanol fed with a pulsed DC power supply. By this I mean the power supply is being turned on and off in a controllable frequency and duty cycle. If I ...
1
vote
1answer
223 views

Backup battery switch with MOSFET?

I recently became very interested in electronics and read few books about it (I never learn electronics in school). I'm still new to the concepts (and don't fully understand them yet), but I decided ...
17
votes
5answers
890 views

Why do some tactile switches have 4 terminals?

I am wondering why some tactile switches have 4 terminals instead of two? For example, take a look at these switches. What is the use of the two remaining pins? If the pins of the exact opposite ...
3
votes
1answer
165 views

How do “beyond the rails” analog switches work?

I'm familiar with using CMOS switches ("transmission gates") for switching analog signals, but you can't use them for switching voltages beyond their supply rails. (So if you have a single supply ...
0
votes
2answers
106 views

Electronic toggle switch

Lets say I have a switch with the usual 2 connections + and - I want when the switch if off (power doesnt pass) the circut to close with output wire 1 and when the switch is on(power passes) the ...
7
votes
5answers
742 views

Transistor as a one-time switch

I'm trying to develop some sort of a one-time switch. Let's say when a criminal opens a switch - transistor opens and alarm sets on. I want it to continue working once switch is closed again. I ...
0
votes
2answers
206 views

On and off Flashing LED's

Hello, I am trying to make 120 (4 rows and 30 columns) LED's go on and off alternatively. (At every given point in time 60 LED's are turned on and 60 off) Components and Parameters : Function ...
0
votes
2answers
77 views

Digital switching of high voltage analog signal

I need to switch a 70 Vpp analog signal from a low voltage (1V8 or 3V3) digital output. The analog signal may or may not be isolated. What is the easiest and/or cheapest method?
3
votes
2answers
144 views

Simplifying microprocessor controlled mosfet switch

I need to switch a load, controlled by a microcontroller. (Actually, bypassing a load with a short-circuit.) My question is how to implement the switch. The circuit will have available to it the ...
0
votes
3answers
90 views

Low Voltage DC controlling 120 AC, with Arduino

I'm looking for a type of device I can hook my arduino (micro-controller) to that will control a set of lights that require 120VAC. Basically I will be making a light organ, where the arduino will be ...
2
votes
2answers
65 views

Safety concerns using metal switches near 300V (low current) lines?

I am building a nixie tube clock whose power supply in the best (or worst) case scenario will put out ~300V. This is obviously quite hazardous if not handled correctly. I need to use at least 1 spdt ...
1
vote
1answer
115 views

Whats the name of a BMW iDrive type of encoder? [closed]

I am looking for a component that some people call a 7 way encoder switch. Basically, if you look at the center piece of the BMW iDrive, its that. It's a knob looking piece that if you turn to the ...