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Questions tagged [switches]

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

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3answers
24 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
36 views

A problem with using 2 MOSFets as switch

I have a problem with following circuit. I think that the problem is, both MosFets are 'on' at the same time. Here is the characteristics Vgs(t) of both of them. What have I done wrong? I'm expecting ...
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1answer
23 views

Problems with Switch Marvell 88E6060 with high temperature [on hold]

I having issues with the marvel switch 88E6060. https://www.marvell.com/switching/assets/marvell_linkstreet_88E6060_datasheet.pdf When the system reach the temperature of 80ºC the PC doesnt detect one ...
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0answers
65 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 ...
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2answers
110 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
31 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
30 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
18 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 ...
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1answer
48 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 ...
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3answers
39 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
35 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
23 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
61 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 ...
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1answer
25 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
59 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
16 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
43 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
96 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
56 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
100 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 ...
1
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2answers
55 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 ...
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2answers
66 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
57 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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1answer
68 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 ...
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2answers
67 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 ...
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2answers
39 views

USB switch matrix switch to control an externally powered LED? [on hold]

Is there a way to wire the lighting on an illuminated switch so that it's powered by a separate dedicated battery and NOT by the matrix encoder device that the switch is a part of? I have a USB ...
0
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2answers
66 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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votes
1answer
75 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
107 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
518 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
46 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
88 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
14 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
18 views

Electrical workaround for wiring a smart switch [migrated]

There's the following setup in my bedroom: I need to wire the WiFi Switch in the setup above so I made the following workaround: Basically I dimissed Light Bulb 2 in order to get the power line to ...
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0answers
30 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
59 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 ...
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1answer
27 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/...
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1answer
53 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
67 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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0answers
22 views

MOSFETs powerbanks and no wakeup

In order to lengthen battery life of a portable thingy, I am building a couple of Powerbank Switches, and learning electronics at the same time. The idea is that the switch, controlled by a PIC, ...
1
vote
1answer
66 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
56 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 ...
1
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0answers
37 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
15 views

Can I connect AC Rotary Switch(32 A, 230 V Two Way 4 Pole), for DC 60 V, 32 A

For Solar Applications, can I use a rotary switch of AC Type?
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0answers
24 views

Switching between multiple lanes to measure resistance

So I have a fair bit of MXM GPUs that have some sort of board problem or another, and measuring each pin vs ground is usually the second step to attempt repair. Oddly, I have an idea to measure ...
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0answers
33 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
46 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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votes
0answers
27 views

PWM Duty Cycle Threshold Switch

I'm trying to make a switch for a PWM signal. I am controlling a PWM signal however I can only control the duty cycle from 50% - 100%, for various reasons I can't change the controller. I want to ...