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Questions tagged [switches]

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

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0answers
15 views

How to Measure Switch State with Current Sensor

I have a motor attached to a relay board with an INA 219 between the board and motor. I would like to engage the relay and turn on the motor, and then flip the motor off when the switch changes state....
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0answers
128 views

What's inside a reed switch that cannot be tested with a multimeter?

I'm shopping for reed contacts that are rated for 230V AC, because I don't want to use an always-on power supply just for a relay and a reed switch. This is surprisingly difficult, but I found this ...
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1answer
28 views

IEC 320 C8 wiring

I purchased this IEC 320 C8 AC socket switch for use in a power supply but I'm unable to find any sort of wiring diagram for it. Could someone please tell me which pin is which? It is not immediately ...
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0answers
43 views

Circuit Design: Momentary switch long press ON, short press OFF

I'm trying to create an accessory controller for my 2001 BMW motorcycle. To those who aren't familiar with the older BMWs, there is a separate "turn signal cancel switch" on the handle bars that when ...
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1answer
49 views

Logic circuit shutting off at target voltage

I deleted the old question and posted another one because I felt the question is now substantially different. I have a potentiometer connected to a current source and I want the logic chip to cut off ...
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1answer
53 views

Monitor position of lever with electronic components [on hold]

I have a project where I need to turn a lever to a postion, and communicate that it has reached the position. An IC chip recieves a signal, and outputs a signal that powers a BJT to switch on the ...
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2answers
49 views

Momentary switch arm and bypass circuit

This is for an RPM limiting device when the clutch pedal is at the floor. The device is active only when it has either a ground or 12V input active (clutch at floor situation). I would like a circuit ...
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1answer
56 views

Tiny micro switch identification [closed]

Anyone know what these switches are. More importantly where I can find a replacement. As you can see one is smashed. They are 4mm wide by 2mm by 2mm. Thanks.
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0answers
62 views

Tap into tv momentary switch to activate externally powered led? [closed]

So I recently acquired a 50" sharp roku tv for free, but the led bulbs keep blowing because bestbuy had them designed to do so running over 30 amps (nutso!) Anywho. I bought some 12v led strips and ...
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1answer
38 views

PMOS High Side Switch

I have been working on a project and one of the ideas was to control power supply of LCD 16x2 module and IR sensor via I/O pin of microcontroller, basically to have them on/off when i need them to be. ...
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0answers
25 views

Voltage controlled switch simulation

I'm trying to short two pins on a chip when an audio signal is received and float them otherwise (same effect as a tactile switch). I thought the best way would be to use a voltage peak holder and a ...
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0answers
20 views

How to swap row/column index in switch matrix ? HC595/HC165 shift registers

I'm having some issue with an Arduino code to interface a 12x12 switch matrix and 12x12 LED matrix. The 12x12 LED matrix is an array of WS28xx and the switch matrix is a combination of HC595 / HC165 ...
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2answers
59 views

Connecting Led in Series with Parallel Switches

I created a diagram for a circuit that i am trying to implement. I have attached my circuit diagram and have been trying to implement it but still have not got it to work. I've checked all the wiring ...
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1answer
28 views

Passive RFID tag with push button [closed]

how can I install a small push button (Tactile Switch) to a cheap passive RFID tag, so that the button pressed will be detected by a RFID reader? I assume to cut open the IC circuit and install a push ...
4
votes
1answer
87 views

How to avoid this voltage when I turn on the circuit?

What I want to do is an Delay ON, but when I press the switch this voltage pass for a brief moment and turns the led on for a moment. How can I avoid this? Should I put the switch somewhere else? ...
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1answer
76 views

powersupply ac to ac

I have recently bought a dcp917S and hoped I finally found a wireless chime that I can tie into my apartment buildings bell system. Since I live for rent there I can't do any changes that are not ...
4
votes
1answer
105 views

Battery saving self-poweroff circuit

I'm designing a battery powered device, which must be turned on by an external 3.3V impulse from a comparator output (TLV3201), and for the sake of power efficiency I want the MCU to power itself off ...
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0answers
90 views

Where should I solder wires of this old simple microphone? [closed]

This microphone contain only four items;a switch,a resistor,a microphone and a battery.The wires of the microphone are cut and I don't know where to solder this wire. I explain the microphone. The ...
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1answer
49 views

Convert a toggle switch into a momentary response

I'm working on a project and I need to use a toggle switch to control a device that expects a momentary signal. What I want is send a momentary pulse when turning it on and off. Ie: swith off to on: ...
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2answers
77 views

Using MOSFET to turn on/off auxillary electronic circuit

I have custom-build e-bike which is basically a motor, battery, controller and an LCD screen with 3 buttons. When I push ignition button, the LCD sets voltage on one of it's signal wires (blue) to 51 -...
1
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1answer
79 views

How can I test the maximum safe current I can put through an electrical switch?

Firstly, apologies as I'm very new to electronics! I'm converting an old broken Atari 2600 to be an enclosure for my ODroid UX4 single board computer. I thought it would be nice to be able to run ...
0
votes
1answer
61 views

Switch that turns one lamp on while keeping the other one off - Mystery

We tried to connect outside light bulp (AC) to a switch where an another light bulb is already connected. We did a parallel connection. Roughly like in the schematic. (I'm not an engineer so the ...
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1answer
52 views

Will this circuit act as a switch?

I wanted to use MOSFET as a switch so my teacher asked me to hook it up like this. But I'm not sure how it works. Since I don't know what my source voltage is , how do I know if Vgs>Vt and even if we ...
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2answers
99 views

What does this mosfet switch circuit do?

I found this piece of circuit in a battery powered sensor. It's a magnetic door sensor. I am not able to figure out what does this do?
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5answers
237 views

Why plug is polarized in the US? What are the benefits?

I could not get a good hold of it, I searched online quite a bit. This must have to do with safety but then non-polarized switches are used through out the world with no issues are risks, so my ...
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0answers
23 views

Simple implementation of a transistor switch circuit with a given maximum activation frequency

Consider "the transistor switch to control a high-power LED" example at: https://learn.sparkfun.com/tutorials/transistors/applications-i-switches Suppose there is a control circuit that is trying to ...
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1answer
49 views

Ideal switch acting on a capacitor

Let's consider this circuit: and suppose that the capacitor C1, charged at the input voltage Vin, at time t=0 is connected by the switch to the virtual ground. Assume also that C and C0 are initially ...
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votes
1answer
40 views

Base resistor for BJT Transistor [duplicate]

I'd like to use PBSS4350SS transistors for driving multiple low power solenoids, but looking at the datasheet I can't figure out what value the base resistor (R1) should be? simulate this circuit &...
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2answers
63 views

Make a one-way switch with a BJT or relay?

I've been trying to figure out how to make a one-way switch with some analogue electronics. i.e.: my first idea was to use a BJT. What I'm trying to find is a design that when the base current is ...
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3answers
103 views

Low power switch input with MCU wake-from-sleep interrupt?

Im trying to read the falling edge of digital logic input to wake up a microcontroller. Below is the circuit I have used. There is an RC filter to provide a ~5ms debounce time, and a 100K pullup so ...
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2answers
32 views

Using an AC rated light switch for switching DC logic level voltage

Would it be safe and within electrical code to switch logic level DC voltage using a standard AC light switch? I know high power DC lines can create arcing with a switch of that style but low power ...
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votes
1answer
33 views

Higher Voltage = Improved Signal Strength

I'm using a reed switch to detect the state of my garage door. It's connected to an ESP8266 via twisted cables of 1.5m and each line has a pull-up as the signal floats too much otherwise. Well it ...
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0answers
10 views

Wiring a switch timer [migrated]

I’ve bought this timer: http://www.pdlglobal.com/data/product_documents/784_installation_guide_document.pdf The wiring diagram is in that PDF. I need help understanding how to wire this up. I’m ...
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1answer
73 views

Controlling an Array of Motors

I am trying to measure the state of a switch on a vending machine motor (model # BC-D27/28). It has a micro switch on it that has a lead going from COM1 to NC2 when engaged and COM1 to NO3 when ...
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1answer
32 views

RF switch(1:14 or 1:16) without signal distortion [closed]

I am looking for an RF switch with no signal distortion in the 1 to 2 GHz band. I need a 1:14 or 1:16 switch, could you recommend switches(for example, an optical switch or a semiconductor switch etc)?...
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1answer
63 views

Operate a switch from a USB port

I have almost no experience with electronics so this might be a stupid question. I have a "switch" that I want to operate from a computer running Linux, it's actually two cables that I need to ...
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4answers
72 views

How to connect/disconnect signal line electronically?

I sometimes do electronics projects as a hobby and as far as I know if you want to switch something in a circuit electronically, transistors are the way to go. And I have used them successfully before ...
-1
votes
1answer
80 views

MOSFET switch is leaking current when off

I have an N-Channel MOSFET that I'm using as a switch, and after wiring 20 identical circuits, I'm finding that 3 of them seem to leaking current when switched to off. The MOSFET I'm using is from ...
2
votes
1answer
46 views

Method for selecting unique resistor values in all combinations

I do controls, and sometimes I want to monitor more dry contacts than I have digital inputs for. I'm cheap, and don't want to pay for more points, so sometimes I'll put some resistors in parallel ...
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3answers
63 views

Illuminate an LED when a ground switch is open

I have a switch that connects the negative side of a solenoid to ground when closed and I need to have an LED that is illuminated when the switch is open. I was thinking of using a transistor to do ...
1
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3answers
89 views

Switching two inputs to two outputs (beginner) [closed]

I'm very much a beginner here, so bare with me. I'm looking to create a digitally controlled switch that has two inputs and two outputs. (Update: The signals are 0V-1V analog.) Here are the two ...
1
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1answer
81 views

Arduino and car's 12V switch

I'm trying to control my headlights with my Arduino and a LDR. For this I will use the Arduino as a middle man between the lights switch and the actual lights. The switch has three positions OFF / ...
0
votes
1answer
72 views

Switch operating at particular touch IC voltage [closed]

Is there any circuit to perform such task more efficiently? I am trying to control a small motor (like a smartphone vibration motor) with specific outputs from the touch IC, so that it can be turned ...
0
votes
1answer
66 views

2n2222 transistor control motor from raspberry

I'm new and i know almost nothing about electronics (i'm a programmer). I have to control a DC motor by using a transistor with a PWM pulse given by my raspberry. This is the scheme i thought about, ...
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votes
1answer
60 views

connecting light

I quickly drew up the lights I wanted to install and connect to two relay and be controlled with one switch. I want the lights on both relays to turn on with the switch. Would the way i drew it work ...
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0answers
38 views

RF switching matrix for DOA

Interested to design an RF Switching Matrix driving a <6Ghz signal from 5 antennas to 2 RX Channels, of the following structure: The possible inputs into the receiver should be: Considering to ...
0
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1answer
45 views

N-mosfet low-side switch being turned on with no direct gate drive signal

I made a relay h-bridge by using two 40 amp single pole double throw relays. I used this h-bridge, and another, to each drive a wheel chair motor fused at 20 amps each. I control the direction of ...
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0answers
46 views

How to get NodeMCU to detect an external switch closure of an unknown voltage?

I'm getting really into home automation as a side project of mine and one of the next things I would love to automate is my doorbell. Short question: If I have a switch (momentary button in the form ...
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votes
3answers
73 views

Using Comparator

I have a comparator: AD8651 that I am trying to use to switch on my relay (relay is rated at 5V). I have a 5V supply that I am using and I am just using a function generator to see the response. For ...
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votes
1answer
48 views

Individual current limits for each of 3 lanes [closed]

I want to be able to limit the current going through each of 3 channels, for a reaction wheel driver. Each lane should be rated for the maximum current draw of each motor, and the real feature: If one ...