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

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21 views

How can I create a SPDT for this motor without using a relay?

I have this 12V ball valve which is controlled by three wires. Contaray to the description below, the motor still draws current after the valve opens or closes, so I will not only want to control ...
0
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1answer
14 views

Help with using S26MD02 Relay as a Switch

Hello i'm fairly new to electronics and I'm currently trying to use a S26MD02 Relay from Sharp as a Switch with DC sources. The main problem is that I dont understand the schematic diagram provided as ...
-1
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0answers
17 views

Is it possible to switch between two power sources depending on the amount of current flowing into the load?

Is it possible to switch between two power sources depending on the amount of current flowing into the load? If so what components would you use? Im a mechatronics major and my background in ...
2
votes
2answers
60 views

Small rotary switch

I'm looking for a small rotary switch but don't know the terminology to find what I'm looking for. To be honest I'm not sure they make what I'm looking for. The closest I have found is this, a rotary ...
0
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1answer
52 views

Designing a switch box for lights

I need to build a box with 12 momentary push button switches for 12 separate lighting sources. I plan to plug 12 fluorescent lights into the box, then I'd like to control the lights with the push ...
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2answers
49 views

Wiring power supply, battery and charger for portable speaker

I'm planning to build myself a small portable speaker. I'd like to include a Li ion battery and a jack for an external 12V-ish power supply. I'd also like to add a jack that will be used to charge the ...
3
votes
3answers
391 views

Convert NO switch to NC

Please excuse what may be a simple question, I am very rusty when it comes to electronics having not looked at them at all for about 25 years! I hope someone can resolve my query. I have a circuit ...
2
votes
3answers
100 views

Is an SPDT switch spark-free?

Question Will this switch spark when it is switched? Intro I am currently working on a electric longboard and I came across this problem. I have a LiPo battery providing power to the motor through ...
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1answer
38 views

Digital Clock - set time x hours ahead?

I have a digital clock made from an electronic kit - it has 3 buttons (1 to set the time, 1 to set alarm, 1 to cancel the alarm). I want to be able to set it so every time it is connected to power ...
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2answers
34 views

Multipurpose momentary button - microcontroller/arduino/esp8266

as more of a hobbyist than a pro I apologise if I'm asking the wrong questions, however I have been researching for a while and hoped Stack exchange might help. I've read a few articles on low power ...
3
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2answers
166 views

What good is an induction coil in a dimmer switch?

I asked about a dimmer switch, and was told one has an induction coil. What benefit is an induction coil in a dimmer switch? ZE-02S has induction coil built-in on the circuit board, so it is 5/8" ...
4
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2answers
545 views

What does the circuit look like to switch two lights using two switches into four different states?

At my workplace there's a room with two entrances, each featuring a push button light switch, A and B. There are two ceiling mounted lights, 1 and 2. Switch A switches both lights on/off. Funny ...
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2answers
50 views

Controlling Two Circuits with One Switch

I'm trying to build a circuit with multiple timers, each with an SPST output relay. I want to connect up my circuit so that if any of the timers reaches their set point, they turn on a beacon. It ...
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1answer
58 views

Conditional Voltage output

I apologize if this is extremely simple, but I am trying to design this: I input 2 voltages, one is 12 V and the other is on the order of .5V. I want to know if there is something I can set up that ...
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0answers
55 views

Why isn't my halogen floor lamp working with new bulb and new dimmer switch? [migrated]

I replaced the bulb and the dimmer switch. There is 120V between the connections when switched on. It varies between 115V on low and 122V on high. The bulb has continuity. I also measured the voltage ...
0
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1answer
66 views

High side switch won't turn off

I'm using the ISP762T. I have a 12V power source and all I want to do is switch it on and off (via microcontroller) depending if I want to power my 12V circuit or not. That datasheet says present a ...
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votes
1answer
52 views

Would Resistance Affect My Project? [closed]

I'm making a pressure switch using ITO coated plastic and foam in-between two pieces. Currently, I'm using a 3v coin battery to power my system. The current plastic I'm using has a resistance of 50 ...
-1
votes
1answer
56 views

Calculating resistance to make BJT transistor act as a switch

Let's say you're given a circuit diagram as follows: I want to find R1 and R2 so that forward voltage drop across the LED is 2V with an overdrive factor of at least 2. Current of 25mA from a ...
3
votes
5answers
214 views

Using MOSFET as switch

I am new here so I apologize in advance for any mistakes in the way I am going about this. I had a question regarding a project that I am working on. I am trying to use a MOSFET as a switch that I ...
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1answer
13 views

Automatic-switching reverse (back up) caravan camera

I'm wanting to try some electronics trickery after many, many years away from it. Unfortunately many of the rules evade me but I feel like I could pick it up quickly, again. My goal for my first ...
6
votes
8answers
1k views

Can I use a 10A light switch with an appliance with a 13A fuse?

I have a vacuum cleaner, which I wish to add a switch to, so that I can leave it plugged in all the time and use the switch to turn it on and off. The vacuum cleaner has a fuse rated 13 Amps. I ...
1
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1answer
43 views

Invert ground vs. open “signal” - relay?

first post here. I'm trying to design a circuit to invert a ground/open input signal. I.e., output is grounded when the input is open, and vice versa. I have a feeling this can be accomplished with ...
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1answer
42 views

Auto-start after power off in nvidia TK1 board

I'm trying to make my Nvidia board (TK1) to boot automatically. i.e., when the power goes off and comes back again i want the board to power up automatically. I have tried the Nvidia forum and found a ...
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2answers
50 views

What type of switch is this?

I need switch which is normally closed, but when I press it, it goes to off state. As soon as I move finger from it, it must go to default state (normally closed). Which type of switch is this? I need ...
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2answers
34 views

A dual-input solid-state switch that will reliably work in a car

I need a switch, but with a small twist. If it was operating on normal filtered DC I would know how to make one myself. But since it's for a car, I need help designing it for reliability and surge ...
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1answer
66 views

Magnetic switch with no moving parts

Is there a magnetic switch (like a reed switch) but with no moving parts? I need a switch that can be turned on by a magnetic field but won't move around due to tremendous shock absorption.
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2answers
47 views

easy way to switch a signal

I have below configuration: ...
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2answers
58 views

switch for AC voltage

I am designing a switch for AC circuit. E.g. when I apply a small DC voltage, AC current is allowed to conduct, otherwise there is huge resitance stop the current from flowing. I found 2 possible ...
2
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1answer
37 views

How to design a transistor current switch for synchronization circuit?

The following diagram is a practical diagram for derivation of the clock signal from the received waveform itself (Synchronization) in baseband PAM systems. I'm looking for a typical circuit for ...
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3answers
53 views

How to interface a SPDT switch with Mac OS X

Before I get started, I am a software developer and I have extremely limited knowledge of circuitry, so please be gentle. In it's most basic form, I guess my question is, how can I wire up a SPDT ...
6
votes
4answers
451 views

What small IC could give switchable I2C pullups?

My goal is to replace a DPST on pullup resistors with something simple, cheap and very small that can be activated with the I2C bus voltage. I thought that this might be a common enough requirement ...
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3answers
40 views

12v on/off switch to toggle state of two circuits

I have an existing latching button switch that controls a low power LED (no more than 1W) from a 12V power supply. I'd like to add an extra circuit to the same power source that is controlled by the ...
0
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0answers
30 views

Switching Ground to Switch Input

I have a bluetooth headphone set that I purchased recently, and I'd like to install a 3.5mm female port so that I can switch from bluetooth to wired input at will. My understanding is that no power ...
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0answers
11 views

How To Switch On/Off A Circuit using GPIO [migrated]

I have a simple circuit that runs on 5 volts. Let's just say for simplicity that it is a circuit with an LED that lights up when a push button is pressed. The problem is that it has a push button ...
0
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2answers
51 views

Looking for a force resistor, but I just want it to act like a switch

I can not for the life of me find something that is a force resistor, so it's flexible, but it acts like a switch. I could also take just something that recognizes if a baby is sitting in a seat. I ...
2
votes
0answers
18 views

Need help with wiring [migrated]

I think I burned out one digital time switch and don't want to damage the replacement I bought. Can someone take a look at the diagram I drew and complete the wiring? The wiring diagram that came ...
1
vote
1answer
64 views

Are relays appropriate? circuit review

I'm designing a circuit to drive two 12V dc motors. I've got two low current switches connected to relays as can be seen in the schematic. These are for power isolation and local motor isolation. Can ...
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2answers
156 views

long wire kickback voltage problem

the long wires acts as inductor which shutdown and sometimes damage my microcontroller(IC1), for the AC part ill be implementing an optoiso along with triac and snubber circuit (lemme know if you ...
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vote
8answers
239 views

Connecting / Soldering a Switch to Breadboard / PCB

I'm pretty new to electronics and I have just found these toggle switches. But I can't figure out how the connectors on the bottom are called in the english language .. :) And also, is there a way to ...
3
votes
2answers
340 views

switch on a long wire end causing microcontroller to shutdown

i've a push button connected to micro-controller using a 100m 18ga wire that cause the micro-controller to shutdown after few times of working properly the circuit is fully functional with a short ...
0
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1answer
59 views

switch for 1MHZ sine wave

I am trying to build a switch that can cut by control the sine wave V1 From the load R1. The main problem is that we have a parasitic capacitor between the drain and source ...
0
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0answers
5 views

W5100 Ethernet shield DHCP fails with a Switch [migrated]

we are using Arduino W5100 Ethernet shield. The code is to try DHCP first and if that fails, then try the static IP. we do the Ethernet Initialization and stop every time. The library is Arduino ...
1
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2answers
50 views

Minimum design for controlling 2 LEDs to light either one or both?

I am an absolute beginner in electronics. So far I have created a circuit with 2 LEDs and 2 SPST pushbuttons, each controlling a different LED. Very simple, you should get the idea without me drawing ...
1
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4answers
116 views

How can I turn off a 3.3V circuit with a 3.3V microcontroller

I'm working with ATTiny85 that has low current (40 mA) GPIO. In the other side I have a power supply (battery with ~5V) connected to a LM317 and an ESP8266 that demands high current (more than the ...
2
votes
2answers
51 views

Will cutting only the Power Lines damage the Data Lines or the Device?

A USB 2.0 Cable should have 4 cables. They are the Vcc, Data+, Data- and Ground. Will only disconnecting the Vcc OR Ground Wires damage the Connected Device or the Data Wires? I currently have a USB ...
1
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1answer
95 views

PNP to NPN Transistor switch

I'm working on project that requires I switch a 12v power supply on the high side of a circuit, using a 3.3v micro controller. To make this work, I'm thinking a can connect a PNP transistor on the ...
0
votes
1answer
61 views

Reverse voltage protection and high-side current switch

Initially I chose a Infinion PROFET smart high side switch (ITS428L2). In the datasheet it is stated that this device can provide reverse battery protection with external resistor. Frankly, I am not ...
0
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1answer
31 views

NJM2072D Application Questions for Audio Detection Circuit

I am building an audio switch with channel priorities. I will use this in car events where we communicate car-to-car on FRS radios. A few of us also use 2 meter amateur radios for longer range ...
3
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5answers
263 views

Three-way AC switch indicator without adding a wire

I am dealing with some three-way light switches that people are always forgetting to turn off. Any suggestions/schematics for making a simple LED indicator at each switch to indicate if the circuit ...
3
votes
1answer
69 views

How to automatically switch RF path to external antenna

I'm designing a circuit that has 2 antenna options for one transceiver @ 1.6 GHz. One antenna is internal and is the default RF load. Another antenna is external - to be attached by the user if ...