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

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1answer
42 views

Switch audio from one source to another one

I am currently working on a project where I have two GSM modules in a single product. Those modules have each one a mic port and speaker port. They will not be used simultaneously but they will be ...
0
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2answers
58 views

SPDT using transistors to switch between two seperate voltage sources

This is probably a stupid question but I have been searching everywhere and cannot find a solution that works. I am trying to come up with a circuit using transistors that acts as a SPDT switch to ...
0
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2answers
70 views

Making a “voltage switch”

I'm an electronics newbie. I have a circuit in which I have two input voltages, Vin and Vflag, and one output, Vout. Basically I want the following: If Vflag =0, Vout =0. If Vflag = 1, Vout = Vin. My ...
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3answers
74 views

Creating a momentary low pulse with a toggle switch

I want to create a circuit with a SPST toggle switch that when flipped in one position the output signal is high and when flipped in the other the output has a momentary low pulse and then rises back ...
2
votes
0answers
29 views

Switch utilization in dc-dc converters

In the book, Power Electronics, by Need Mohan at the end of chapter 7, it is this image: Relating the output power and the power that the transistor is handling, I want to reproduce this plot for ...
0
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1answer
44 views

ZVS Driver design and initialization

I'm fascinated by zero voltage switching (ZVS) drivers. So I've been playing with simulations of them in Falstad. Two things I don't understand: How is the oscillation initiated in an actual ZVS? ...
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2answers
41 views

NPN circuit to switch 12v 1A DC load by 3.3v 1A DC using PIR

I am trying to switch on a circuit using PIR motion detection. I have a PIR module which outputs 3.3v 1A DC when it detects a motion. I want to switch on a circuit rated at 12v 1A DC. I read some ...
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2answers
158 views

How does this simple contact debouncing circuit work?

I made a contact debouncing circuit using a capacitor. The main idea was to charge the capacitor, so that the bouncing on the signal would be "smoothed out". It works, but It's been a while since I ...
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0answers
39 views

Best and Simplest component for switching

I have a SIM 928 that has 4 pins for serial rx/tx. One set is for GSM and the other is GPS. On raspberry pi or micro controller, I only have one set. What is the best component to use to switch from ...
0
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1answer
57 views

What Type Of Switch Is only on for a second [duplicate]

I am looking for what type of switch is only only for a split second (1 second max) even when held. Basically: Press and hold button-->LED only on for a split second and back off even though I am ...
11
votes
4answers
984 views

Rocket launcher circuit design

I'm building a model rocket launcher with my son. The circuit is very simple as you can see. We want to add a buzzer and a LED/bulb when it is turned on as a warning to stay clear of the rocket. How ...
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0answers
19 views

i need IGBT Driver for 6MBP100RA120? [closed]

i need to IC driver for " IGBT-IPM R series 6MBP100RA120 " With the ability to create dead time to h_side and L-side in full bridge inverter. since, this " IGBT-IPM R series 6MBP100RA120 " has ...
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vote
2answers
233 views

Is there any symbol for Alternate action switch?

There are some switches, that looks like push-button switches, but acts like On-Off switches (i.e. can maintain contact). In one-press they turns-on (and looks slightly deeper), and in next-press, ...
0
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1answer
62 views

How to use arduino nano to switch an 230V AC motor on/off?

I want to switch on and off an 230V AC motor with a relay what is controlled by an arduino nano. The on time and off time would be able to set by a 3-position slider switch. So would be 3 different ...
0
votes
1answer
42 views

Advice needed for a switch controlling 3 switch states at once?

Above are three switches for an electronic system to operate. SSR is a sold state relay, and L indicates the hot line for 230VAC which is powering a circuit. Switch 1 is connected to a wire in the ...
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vote
2answers
90 views

Will this high side p-mosfet switch circuit work?

I have two micro-controllers on a PCB. Both operating on 3.3V. One microcontroller will always be running. I need to cut off the power supply to other micro-controller sometimes. (This is not for ...
0
votes
3answers
32 views

Illuminated rocker switch different wirings [closed]

In the following links the illuminated rocker switch power terminal is shown as one of the further terminals, and accessories terminal is in the middle (brass is ground or neutral). ...
1
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2answers
78 views

Low voltage drop transistor/mosfet switch - 3.3V 200mA

I need to make a switch. However p-n junction drop seems to be a problem for my use. Hence I am unable to use something like this: In this case, my load won't be getting exact 3.3V across it. ...
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votes
1answer
69 views

What kind of a Switch is this? How can i use this Switch [closed]

I found this switch in DVD drive, I think its a kind of mechanism which reverses the polarity of the motor. If so How can I use this with arduino uno? THis link might be useful : ...
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2answers
41 views

Electric latch for math toys

Please fix my tags. I'm making a series of interactive puzzles for use in classrooms. One of them is an equation graphing. It will have a grid of screws stuck into wood, with the axis drawn on. ...
0
votes
2answers
59 views

Switch to make MCU pin float [closed]

I have an application where I need to make a ADC input pin (0-1V) float controlled by GPIO (any connect it in other cases to its input obviously). I was considering a transistor in-line with the ADC ...
2
votes
1answer
142 views

what is the easiest trick to check whether a transistor is used as a switch or current amplifier?

Newbie in electronics here. I think I know the basic theory behind transistors.I would like to know based on the schematic how you can know whether the transistor is used as a switch or an amplifier ...
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2answers
74 views

Raspberry Pi controlled power on/off switching of an Ethernet connection

I want to power on/off an (Gigabit) Ethernet connection physically by using some circuit. The main idea was to use a transistor with the Raspberry Pi GPIO to switch an Ethernet cable. The schematics ...
0
votes
2answers
33 views

Low amp/volt relay for microphone switching

Its that time of year when I revisit one of my old projects and try to improve it. Currently I have a small 12v PA system that has a microphone and I've added an 3.5mm auxiliary input to play music ...
1
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0answers
39 views

FET Default on, Turn off with Optocoupler

I am relatively new to electronics and having trouble designing a circuit for a redundant power supply, which I would like to switch to battery if the voltage regulator turns off. This will be ...
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2answers
37 views

Can I use this Emergency Stop Switch Push Button Mushroom Push Button 4Screw Terminal_K2 for switching on and off a 4500W 220V heating element? [closed]

Here is the link to the emergency stop switch - http://www.ebay.com/itm/NC-N-C-Emergency-Stop-Switch-Push-Button-Mushroom-Push-Button-4Screw-Terminal-K2-/272048010923?hash=item3f575336ab. Thanks.
0
votes
1answer
39 views

Using BILATERAL SWITCH properly?

Summery: I am trying to figure out if I can use a bilateral switch as if it was a tiny relay capable of communicating UART signal, or are there things I am missing. Now, the long explanation. So, I ...
0
votes
1answer
47 views

Placing a diode between low and high beam on a motorcycle

I am trying to place a diode between the high beam and low beam on my motorcycle. My headlight is a skull, it has the two eyes as high beam, and the mouth as low beam. the way it is wired, when you ...
0
votes
2answers
55 views

Implementing a automated DB25 switch [closed]

I currently have an application that uses a DB25 switch to switch signals between two devices (it's not actually a parallel port - there are analog and digital signals as well as DC power on the ...
0
votes
1answer
31 views

Terminology for referring to a normally open switch vs the normally closed setting it is used in

Is there some standard way to distinguish between the normal state of a particular component and the environment in which it is used? For example, a reed switch would be considered normally open if ...
0
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1answer
42 views

Relay circuit with off switch

I've been searching for a similar circuit and only found latching relays with two momentary switches for on and off. I don't know if this circuit has a specific name or not, and since I am a complete ...
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0answers
22 views

A pulse triggered bistable switch circuit

I'm designing an IC but need a simple circuit to turn ON/OFF by a pulse and stay in its state until another pulse comes to switch it to the other state, I found several things like those on the ...
0
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0answers
71 views

Can some help me understand this ground switching circuit?

I am trying to understand a switch circuit related to a project that I am working on. Pin 1 - 12v signal for switch backlights Pin 2 - 12v signal for switch on/off indicators Pin 3/4 - Unused Pin ...
2
votes
1answer
39 views

Switch in Circuits

I am really confused about what happens to the circuit when the switch is open or closed. What does t=0 , t=0+ , t=0- , t<0 and t >0+ mean ? what does it mean if the switch has been in ...
0
votes
1answer
61 views

A switch that is only ON if the reference voltage is matched -+ 0.1 volts

Im a beginnerish will electronic and im looking for a switch that is only ON if the reference voltage is matched -+ 0.25 volts. So if i have a reference of 2.7v to match and i feed the switch a 2.75v ...
0
votes
3answers
69 views

Double-throw switch with no common connection?

I need a DT, ON-OFF-ON switch to control two independent circuits with no common connection. I need something that behaves like either A and B, or C and D in the diagram below. Does such a thing ...
0
votes
2answers
69 views

Logic level MOSFET switch

I am trying to use a FET to switch on a boost converter. simulate this circuit – Schematic created using CircuitLab From reading I have found that people like to use IRFML8244TRPBF for ...
0
votes
1answer
38 views

Making a light switch timer?

I'd like to have a light switch that turns on for at most 1 hour. My idea is to put a USB charger (110AC -> 5DC) + arduino + relay inside the wall. When the switch is turned on, it will turn the ...
0
votes
2answers
42 views

12 volt switched by 5 volt

I have an issue with 12 volt DC LEDs installed on a 5 volt DC circuit. Switching must be performed as close to instantaneous as possible. So I searched around but nothing would do what I need. I ...
0
votes
1answer
29 views

Independently toggling two series switches to multiply two pwm signals

Preface It is known that one can synthesize a signal into a train of boxcar pulses (pwm modulation), each with the same amplitude, if proper low pass filtration is applied to this pulse train before ...
2
votes
2answers
169 views

Can I use pushbuttons with pull-updown driven by a gate?

I have a digital circuit, which generates a signal passed to another part (let's say a flip-flop) and I want to be able to force this signal 0 using a pushbutton. Do I need to use any additional logic ...
0
votes
2answers
31 views

Step Response RC Circuit: Current at Capacitor

I have a problem understanding why is that ic=0 at t<0 if the switch is closed for a long and only opened for t=0? My friend told me that at t<0, the ic will always be 0A regardless whether ...
0
votes
1answer
98 views

Help explain how this ac switch circuit works

Below is an ac switch circuit. COIL1_EN is used to enable or disable the switch. Does any one know how this ac switch work? I think it may be a standard design, can anyone give the related ...
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2answers
93 views

Is there a kind of switch that after being pressed, even if not released, will open the circuit again?

I want my sliding door to turn off the tv. So I opened the remote control of the TV, soldered a KW12-3 switch to the pads of the original ON/OFF momentary button, and everything is working good, I ...
0
votes
1answer
131 views

Best way to control power with MCU gpio pin

This is my circuit. An MCU gpio pin should control the power of another IC. Because the component requires more current than the gpio pin can drive, an N-Channel MOSFET is used. This is IC has no ...
1
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5answers
179 views

DPST switch control 5vDC and 220vAC

I would like to make usb-charging sockets from two sides of the bed, and I don't like the idea of power supply working 24/7 so I decided the following scheme to have power ON while me or my wife are ...
0
votes
2answers
42 views

Built-in air conditioner timer switch wiring

I'm not sure if this is specific to this model only, but I was unable to find any standard wiring schematics for this type of switch. This is for a Haier HPAC9M air conditioner unit. I want to ...
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2answers
71 views

MOSFET-N as a switch for several ICs

I want to use MOSFET-N (MTM232270LBF) as a power switch for several ICs in my project. It should poweron the devices when logic level is high (3.3V) and poweroff when 0V. I want to ask you if ...
0
votes
2answers
42 views

Help with DC switch current

I have a DC switch rated at 2A at 36VDC, if I were running the switch at 4VDC what would be the maximum current I could safely run through it? I'm assuming I can't simply use the wattage to calculate ...
0
votes
1answer
44 views

Switching circuit or relay [closed]

I'm new here and don't know much more about electronics.I need a switch/relay that help me off DC line when AC (grid) line is available and automatically turn on when AC (grid) line is not available. ...