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Questions tagged [switches]

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

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2answers
45 views

Quick question. Will this mono/stereo switch system work on my mixer panel?

So basically, I designed a mixer panel for monitoring my band when we play live. However, some of us play with a stereo in ear monitoring system and some of us use a mono speaker by their feet. I don'...
0
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2answers
101 views

Anyone know the name of this type of switch?

Does anyone know the name of the internal switch (circled in red) in this assembly? It is a latching switch, so much to close and then push again to open. I've been Googling and hunting for about 2 ...
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1answer
29 views

Find the transfer function of the circuit if current I is the measured output

So there's this problem I am trying to solve: Consider a series RL circuit corrected to a DC voltage source and an on-off switch. Assume R = 2 ohms, and L = 1H, and applied voltage V = 10 volts. ...
1
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1answer
75 views

tilt switch to activate power socket

I am after a way to activate a 300 W LED lamp to come on when a trampoline is jumped on and to turn off when the mat goes level again, then back on when jumped on and so forth. I was thinking tilt ...
0
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1answer
55 views

Delay turn off relay [closed]

I am an entry-level hobbyist. I am trying to find a delayed turn off relay for a light, but all the ones that I can find I don't understand how the switch fits into the equation. Taking this relay ...
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2answers
42 views

What's the use of the 4 outputs of a power entry module (Qualtek 864-10/009), and how to interpret it's circuit digram?

Main question: What is the purpose of having 4 outputs? If I only had pins 1 & 4, I would be able to use 115VAC when it's set to 115VAC, and 240 VAC when it's set to 240VAC. For 240VAC setting:...
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2answers
47 views

Relay switch not switching

So I purchased a min 3V relay switch (https://www.digikey.com/products/en?keywords=ADW1103HLW) and am trying to turn it on with a simple transistor setup. The data sheet says I only need about 66.7mA (...
2
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3answers
60 views

Opto switch for detecting translucent polypropylene

I am building a liquid handler (a CNC machine that pipettes small quantities of liquids). The machine switches polypropylene "tips" between pipetting different fluids. Positional accuracy within 0.5mm ...
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0answers
72 views

Power switch - IN and OUT connected all the time

A while ago, I asked about detecting whether a power jack is connected or not, in order to select power source from USB or DC jack. You can see the question here: Power selection circuit for USB or ...
1
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2answers
114 views

What's the name of smd buttons build of a simple thin metal sheet which flex when pressed?

As the topic title, I tried to find them but cannot get any informations about. They are a sort of SMD tact switch made only by a very thin curved metal sheet. When you press they flex and make ...
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1answer
33 views

Ideas / Alternate solutions to trigger a switch

Thank you for reading my question, I hope to learn a new way to solve my problem. I don't expect anyone to design a cicuit etc as hopefully I can do that myself, just some pointers at possible ...
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1answer
31 views

How to connect switches to power transformer?

I'd like to use two rocker switches, each is single pole and including a light bulb on the inside (230VAC) to control the powering the system. I'd like to connect both of them to the transformer with ...
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0answers
22 views

Split Power Plane when using Load Switches?

To do power saving for a battery operated product, I am using couple of load switches to shut down peripheral power when not using that. PCB stackup - Signal(component), Gnd, Power, Signal -- 4 ...
1
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1answer
60 views

Using an analog voltmeter to display the changes in out put made by a dimmer switch for a light

I'd like to preface by saying k know little to nothing about electrical engineer but would like help with making a lamp. I want to use a volt meter style gauge to display a different reading for a ...
0
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3answers
49 views

Multiple input to single output converter and vice versa

First question so please forgive any mistakes. I'm trying to design a system by which multiple LEDs are controlled by multiple switches, but without using as many wires as there are switch/LED pairs. ...
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2answers
39 views

VL input on analog switch

I'm going to use a DG403 analog switch, supplied with +/-15V, to switch an audio signal below that range. datasheet The logic signal would be 0V/5V, so I need 5V on the VL pin of the switch. The ...
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0answers
32 views

Raspberry Pi + L293D to switch 12V solenoid valves

I am porting an Arduino project to Raspberry Pi. On the Arduino I switched two 12V solenoid Valves with the help of a L293D IC. It worked perfectly. Now I am porting this system to a Raspberry Pi. ...
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2answers
65 views

Is it possible to build a simple circuit where one switch controls all bulbs but small switches control individual bulbs?

Putting aside the embarrassment of asking for a 'simple' solution, I will state in advance that I know I could do this with push-to-make switches and MOSFETs. What I am stuck on is whether I am ...
0
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1answer
30 views

custom solenoid trigger circuit

I have a custom made solenoid that is required to work at 60V to actuate with enough force. I have tried two circuits shown in the figure below but both don't work. In the first circuit, the voltage ...
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0answers
68 views

Turning on/off power to NeoPixel Ring with MOSFETs from ESP12-F

I am creating a pcb with ESP12-F which will contain Neopixel Ring 12. As this will run 24/7 and Neopixel even when completely off drains about 15-20mA and I will have several of those the consumption ...
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0answers
22 views

Working with NLAS4684, NO2 does NOT work

I'm working with Dual SPDT Analog Switch NLAS4684(ON Semiconductor). First I'll attach a pinout: I just want to short COM2-NO2. (Vcc = 5V) In the datasheet, it says Yes, apparently, if IN1 = IN2 = ...
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1answer
50 views

Wide voltage range comparator (with zener diode)

i need to switch the transitor (Vce minimal) when input voltage (0 - 18V) is greater than 6.3V. To achieve sharp edge I use a zener diode D1. However, I also need a protect transistor base, so I use a ...
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2answers
113 views

Solid state relay does not reset

I replaced some old electromechanical relays by those solid state relays from Wieland to improve the switch speed of my system but I can't manage to switch off the solid-state relay. Here is the ...
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1answer
65 views

Bypassing refrigerator door alarm piezoelectric buzzer

My appliances keep beeping at me. How can I deactivate or bypass this refrigerator door alarm buzzer without affecting the rest of the circuit? I thought I could just cut/connect the wires at the ...
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2answers
126 views

Where are all the multiplexers?

I am trying to implement a circuit where 2 SPI drives (basically two masters) speak to 1 slave. Both operate on a 3 wire SPI. Keeping that in mind I was going to have the CLK and MOSI of both as ...
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2answers
94 views

Is my understanding of this level shifter correct?

I am considering using this TI LSF0102 level shifter in my circuit - but would like to understand, based upon its datasheet, if I have my understanding correct. My aim is to be able to supply 3.3V ...
0
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2answers
85 views

Reed Switch Failure Modes

I've been playing with these through hole reed switches: MDSR-4-12-23. It has been my experience so far that you have to be very careful in handling them, including when bending the leads to 90 degree ...
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0answers
62 views

What is the connection pattern for multi-pole push button switches like this one?

It does not appear to be one of the two obvious choices - one side common or button down connects terminals across from each other. Used on an HVAC unit. It is busted so I can not probe it out. ...
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votes
1answer
92 views

What would the maximum current draw for this chip be?

I am looking at using this logic switch in my circuit: https://www.onsemi.com/pub/Collateral/FSTD16211-D.pdf Looking at the datasheet I am finding it hard to figure out what the maximum current draw ...
0
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2answers
86 views

Long (500ms) Pulse Extender

I have an SPST momentary tactile switch and want the pulse, whatever length, to be extended to 500ms (unless of course the button is pressed for longer than 500ms but we can ignore that if we hold the ...
0
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2answers
73 views

MOSFET as Power Switch Issues

I am trying to use a N-channel MOSFET to toggle battery power going to a 5V voltage booster using the circuit shown in the attached image. Battery voltage is 3.7V and the gate voltage is 3.3V. High ...
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1answer
77 views

Light Activated Switch

Can I use a 12 V power supply as the source of electricity for this circuit? And where do I connect the positive/negative of my power supply? I'm a bit new to this so please understand, thank you.
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2answers
114 views

Why is my dark activated circuit not working?

When I turn my circuit on the LED turns on but even in the dark the LED is still on. Can someone help me?
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2answers
55 views

How to convert light activated switch into dark activated switch [duplicate]

Can anyoe teach me how to convert this into light activated switch (https://i.stack.imgur.com/r6lZH.jpg)
4
votes
4answers
540 views

Use audio frequency to light up multiple LEDs

Need some help here - I need to light up about 20 different LEDs based on the frequency input(200 Hz-20,000 Hz) Eg: The circuit should light up the 1'st LED when the input frequency is between ...
0
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1answer
50 views

contact DPST switch for dc inside door

I want to put a LED inside a door and to get the current to the door I was trying to find a device that could conduct while the door is closed like so https://www.ebay.com/itm/Two-Function-Magnum-...
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0answers
70 views

How to convert light activated switch [duplicate]

Can anyone teach me how to convert a light activated switch into dark activated switch vice versa.
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1answer
91 views

BJT as a switch: what am I doing wrong?

I'm studying the following circuit The image is explicit but as you can see the input measured in the upper terminal is a square wave with \$E_c\$ and \$-E_c\$ as levels. Now I also had no trouble ...
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1answer
15 views

How to properly use an OPB917BOCZ photoswitch?

I am building a weather station with an anemometer. I have an OPB917BOCZ photoswitch on-hand that I would like to use as the tachometer if possible. However, I can't seem to have any luck with it. ...
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0answers
33 views

Drive 12v 40a relay with peak 3.3v pulse

I bought a Viper 5806v keyless entry/alarm for my car recently. My car uses a reverse polarity mechanism for door locks. It is not nessacery to install like this, just shorting the lock/unlock wire to ...
3
votes
2answers
89 views

Hall effect sensor as 2 wires switch

I need to find a way to make an on/off proximity detector triggered by a magnetic field, fitting in a small space of about 5mm ^ 3, and connected to the board by only 2 wires. I know a could use a ...
0
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1answer
28 views

Powering dual 5VDC, 2.4A USB ports via a switch in vehicle

I have an illuminated 2 port usb charger that plugs into a cigarette lighter/accessory socket in a car. The face of the charger is flat and sits flush when inserted into the cigarette lighter/...
0
votes
1answer
54 views

1st order circuit analysis

I'm having trouble with this exercise which I don't have a solution for, I'm used to dealing with simpler 1st order RL or RC circuits. Mostly I'm a little confused with the sinusoidal generator and ...
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votes
1answer
68 views

I have an SMD switch how can I find the part number?

I have an SMD switch but I don't know its part number. I searched suppliers sites like Digikey and ... but I couldn't find it. Is there any other way to find the part Number? The size is 6*6*5(...
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1answer
97 views

Latching power switch circuit

I am trying to understand: 1) how the following circuit works and more specifically how it turns on. 2) How to to modify it to get a hold on/hold off behavior instead of push on/hold off to prevent ...
0
votes
1answer
61 views

How to mute microphone in 2-way communication when the speaker is active?

I'm making my own two way intercom for my house. There will be a speaker and microphone above the front door of my house (as well as a camera). When someone rings my doorbell, I get a notification on ...
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0answers
39 views

The best type of electronic switch to control the signal coming from a pickup coil on a motorcycle

So, my motorcycle has an ignition system that's not really secure, all someone has to do is pull the ground wire going to the ignition coil and anyone can start it up. The only other way to stop it is ...
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0answers
39 views

Delay timer for car bar light to stop mode cycling

I just brought a bar light for my vehicle. My problem is the light has 4 modes (white, white flashing , yellow, yellow flashing) and the modes are triggered by turning the light off then on in less ...
0
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1answer
50 views

Relay Circuit Explanation

I am trying to understand relay circuits better. I have two circuits in question below. Left Image I understand Pins 2 and 9 are the coil contacts. I would wire a microcontroller outpin pin to a ...
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0answers
50 views

LED and optocoupler MOSFET switch connected with an inductive load

I want to ask, if this circuit will work. I think the flyback from the inductive load the mosfet is connected to will break the optocoupler. The LED is connected through a resistor which should ...