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

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0answers
26 views

test 0.5A inductive load through switch circuit

We are a switch component manufacturer and typically run life cycle tests with resistive loads through our switch circuits. Can someone recommend a circuit diagram set up to test an inductive load ...
1
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1answer
40 views

Searching for the name of a rotary switch/push button switch combination [on hold]

I'm looking for a switch that combines a rotary switch and a push button switch. The only one I could find is the "Würth Elektronik WS-RPTL 481RV12172100" which is not exactly what I was hoping to ...
0
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0answers
33 views

Solenoid valve circuit causing scale error in labview

Last night I checked to make sure that my solenoid valves were working by lifting up the float switch that I have in a tank, which controls the solenoid valve circuit. The solenoid valves worked, but ...
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1answer
50 views

Detecting solenoid ON and OFF state [on hold]

I want to detect solenoid ON and OFF state. If solenoid ON, with respect to HIGH signal no problem. If solenoid not working means with respect to HIGH signal, solenoid remains OFF state. In that ...
0
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1answer
53 views

Light dependent resistor (LDR) switched LED-circuit

NOTE! The LDR has a minimum val = 2kOhm and a max. val. = about 5 MOhm Im trying to build this circuit for my radio station. I would appreciate som help. Your general opinion about the ...
0
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1answer
49 views

Wiring a 5 Pin LED Switch

So my problem is that I need to wire up a 5 pin LED switch to a motor and a car battery. Seems easy enough... But I need the LED to be on at all times. That is the bit I'm getting stuck with. ...
2
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0answers
42 views

Mosfet LED switch protection

I'm designing a Mosfet based switch that uses a low current reed switch to control either 24V or 12V LED strip lighting. Having some issues with the protection circuits. My specifications are as ...
0
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1answer
95 views

“switching box” with microcontroller and relays [duplicate]

I need to build a switching box, which switch between 4 pairs of the contacts, and give one of the pairs to the output (to read one of the 4 signals). I am going to do that as follows: For each pair ...
9
votes
3answers
215 views

What causes this knee in my MOSFET drain voltage drop?

FINAL UPDATE: Understand a previously mysterious power MOSFET switching waveform wiggle! @Mario uncovered the root cause here below, distinctive to so-called VDMOS devices, typical of many power ...
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2answers
79 views

High side switching

I have designed a BJT based switch to enable and disable one or more loads with a microcontroller pin. The situation is the following: The controller pins work with 3.3V The devices require 12V to ...
0
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2answers
57 views

Monitor status of slow-switching (1 second) signal

I need to make a circuit that can look at a signal and turn an LED on or off if the signal is actively switching. The input signal turns off and on for a period of about 500ms, but sometimes will be ...
1
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4answers
110 views

Electronic switch with negative and positive voltage

I want to use a micro-controller to send data through a max232 that will convert the 0v/5v signals into -12/+12v signals. The problem with this IC is that when there's no signal, it sends a +12v ...
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2answers
84 views

Identify the change in switch states using a single wire system

Say I have 10 switches which will be automatically tripped at any time. The switches are supplied with the constant voltage(Say 5v). So the conventional way for identifying the trip is by connecting ...
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1answer
52 views

how to turn of stereo when buzzer is activated

I have a GPS geo-fence warning system that activates a buzzer alarm when the vehicle enters a area it should not. The problem is if you are playing the stereo loud we can not hear the buzzer so what ...
2
votes
1answer
66 views

Two different circuits on one SPDT switch?

I have an air condition condensation pump that has a float switch which interrupts the control signal from the thermostat to the outside aircon unit if the water level in it gets to high - i.e. if the ...
0
votes
2answers
139 views

Low power battery backup

I am currently working on a low power battery backed data logger. An Intersil ICL7673 backup switch is used to switch between the battery and external power. Because the circuit draws more than 30mA I ...
1
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1answer
64 views

How to turn a DIP switch into an array of logical values

Is there a better way to turn a open/closed switch into a logical value (capable or sinking or sourcing current) other than: simulate this circuit – Schematic created using CircuitLab I'...
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votes
3answers
90 views

switch off on 5v, on on 0v [closed]

i have a 2.4 tft lcd shield for arduino. I want to turn backlight off and to light it using the reset button from shield. This button outputs 5v when not pressed and 0v when pressed and led backlight ...
0
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2answers
40 views

Generator supply not working on Automatic changeover

I am using Havells Changeover for switching between generator and main supply. There are three slots. Main Gen Load Main has two Neutral wire, Gen has one, but Load has no Neutral wire. When ...
0
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2answers
77 views

How to fade or delay a DC Signal to remove speaker “thump”/“click”/“pop” from transistor switch?

I'm trying to create a digital audio switch or relay using an Arduino nano. It's a very simple circuit, it's just a gate (transistor) which is operated by a digital signal (computer) through a ...
0
votes
1answer
37 views

Portable Speaker Powered by Battery and Power Supply Separately but Can Charge the Battery From the Same Power Supply [duplicate]

I'm building a portable speaker using a PAM8403 amp, 3.7v battery, and a battery charging module, all powered by USB input. What I want to do is be able to switch between 1) charging the battery ...
0
votes
1answer
37 views

Help to identify middle click microswitch in Razer Naga mouse

Can someone please identify microswitch used for mouse wheel click (sw3 on the pcb)? Here is an Imgur album with Naga disassembly. Recently my Razer Naga middle click became less responsive. It ...
0
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0answers
36 views

question on “Intercom” circuit I am planing to build

I am using Voice Record Module to save messages and then play them to one from selected outputs ...some kind of weird intercom system. My OA is LM386 [can only do 2 links but I'll post image relevant ...
0
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2answers
68 views

How to detect that a voltage source is not powered? [duplicate]

I need to detect when the switch SW1 is on and when it is off, and this input has to be sent to a GPIO of a microcontroller. I have no idea how to implement the circuit required to achieve this goal, ...
0
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1answer
50 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
69 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
77 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
91 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
1answer
73 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
75 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? ...
0
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2answers
48 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 ...
0
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2answers
165 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 ...
0
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0answers
44 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
64 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
1k 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 ...
1
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2answers
246 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
77 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
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1answer
47 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 ...
1
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2answers
99 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
33 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). http://www....
1
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2answers
88 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
71 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 : http://www....
0
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2answers
43 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
61 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
146 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 ...
0
votes
2answers
88 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
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2answers
42 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
43 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 ...