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Questions tagged [switches]

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

0
votes
2answers
18 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 (...
0
votes
1answer
138 views

How to analyze RL circuit with sequential switching?

I am trying to solve this question: However, I am having difficulties solving as I only have come across circuits which are initially closed then opened, not vice versa as is the case here. ...
2
votes
3answers
48 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 ...
-1
votes
0answers
39 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 ...
12
votes
3answers
97k views

MOSFET as a switch?

In the picture shown, can "Output" be controlled to be 0V or 12V based on "Control"? Will be Drain and Source the way it is connected be a problem?
1
vote
2answers
157 views

high side MOSFET switch and BJT interface with MCU GPIO

im operating a 28V contactor using a GPIO from my MCU, i have a 28V supply readily available. im looking to surpass the gate threshold of the MOSFET by introducing a NPN BJT with a 10V supply, with ...
0
votes
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 ...
1
vote
2answers
156 views

electronic switch, understanding on-resistance measurements

I'm trying to understand from the datasheet, how much on-resistance I will get from this electronic switch: DG411 datasheet: https://datasheets.maximintegrated.com/en/ds/DG411-DG413.pdf given this ...
0
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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 ...
1
vote
2answers
113 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 ...
0
votes
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 ...
0
votes
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 ...
15
votes
8answers
40k views

Make a momentary switch control a toggle

What are the simplest, cheapest, smallest ways to make a momentary switch produce a 2-state toggling output (latching momentary switch)? In other words, the output is continuously low, and when you ...
0
votes
1answer
157 views

Hamlin Reed Relays for Audio: Sink or Source?

I'm building a small stripboard audio switchbox using some hamlin 5v reed relays (HE3621A0550, mouser link here). A small SPST momentary switch activates the relay. Wondering if the best practice is ...
1
vote
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 ...
1
vote
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 ...
0
votes
3answers
40 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. ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
0answers
61 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 ...
1
vote
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 ...
0
votes
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. ...
0
votes
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 = ...
0
votes
1answer
179 views

Switch/Pushbutton for Multiple LED String Lights

I'm helping my daughter with a science project. We're designing a glove for crossing guards with red and green LEDs attached. I thought it would be a good idea to put a small button in the thumb area ...
0
votes
2answers
97 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 ...
1
vote
1answer
65 views

Pausing a clock signal generated by 555 timer

I am planning to make a simple integer adder/multiplier which needs a variable frequency, comparatively slow clock (around 1 to 200 Hz) for demonstration purposes. I used the following generic 555 ...
0
votes
1answer
57 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 ...
0
votes
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 ...
1
vote
2answers
56 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
votes
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. ...
0
votes
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 ...
0
votes
1answer
305 views

Switching +12V, 0.5A output with a low +3.3V input?

I have MacMini with broken PWM (pulse-width modulation) 4 wire FAN controller (FAN runs at full speed all the the time) and as MacMini schematic isn't available, I bought an external PWM FAN ...
1
vote
1answer
310 views

Alternative On/Off Toggle momentary button and Raspberry

Hello. I found this system with Alternating ON/OFF Switch that I want to use it with a momentary button to turn on/off a led. It's working with IC 4069 Hex Inverter on 12V. The question is how can I ...
0
votes
1answer
266 views

Soft-latch auto-reset OFF (hold) / ON (press) button, is the schematic correct?

I'm looking to make a soft-latching interface with a single momentary push button. Required features for my build are (edited, sorry for bad description) : Circuit should always start in OFF ...
0
votes
2answers
39 views

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

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
votes
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 ...
0
votes
2answers
67 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 ...
0
votes
2answers
108 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?
-1
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.
-2
votes
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 ...
2
votes
1answer
818 views

Arduino Self Power Circuit

new to electronics here, so bear with me... What I'm trying to do, is use a single momentary switch to act as both power and input for an arduino. The schematic pictured is a basic layout of what I'm ...
0
votes
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-...
0
votes
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.
0
votes
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 ...
0
votes
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. ...
0
votes
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 ...
0
votes
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 ...