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

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2answers
156 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
votes
2answers
537 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 ...
2
votes
2answers
48 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 ...
1
vote
1answer
54 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 ...
0
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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
votes
1answer
62 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 ...
-6
votes
1answer
51 views

Would Resistance Affect My Project? [on hold]

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 ...
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0answers
28 views

Automatic cut off time delayed switch [closed]

I want the 12 volt circuit to stay "on" for just 10 seconds, every time the switch is pressed.
-1
votes
1answer
55 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
207 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 ...
0
votes
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
vote
1answer
41 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 ...
0
votes
1answer
41 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 ...
0
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2answers
49 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 ...
0
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2answers
32 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 ...
0
votes
1answer
63 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.
1
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2answers
47 views

easy way to switch a signal

I have below configuration: ...
0
votes
2answers
57 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
votes
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 ...
0
votes
3answers
52 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
449 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 ...
1
vote
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
votes
0answers
27 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 ...
0
votes
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
votes
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
151 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
234 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
337 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
votes
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
votes
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
vote
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
50 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
vote
1answer
90 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
57 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
votes
1answer
30 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
votes
5answers
260 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
67 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 ...
1
vote
2answers
53 views

How much power (amps) through 5.5mmx2.1mm power jack? Through a DC switch?

I am in the process of building a DSLR cooler (I use it for astrophotography) using a couple of TEC1-12703s (12V 3.3A) or TEC1-12704s (12V 4A). The ultimate idea is to run the TEC's at a higher power ...
0
votes
2answers
60 views

Connecting a Raspberry Pi to a 220V switch

I have a switch that works at 220-230V AC and I'd like to link it to my Raspberry Pi and I want to know what I have to do from an electrical point of view. So my switch, when switched on, places 220V ...
0
votes
1answer
41 views

How does a momentary dpdt switch function?

Ok I'm feeling dumb right now. I got one of these momentary dpdt switches and can see via ohm meter that the middle terminals are normally connected to one of their corresponding edge terminals when ...
1
vote
3answers
65 views

Calculate voltage and current in time dependent circuit

I'm working with this time dependent circuit, and i'm having troubles with some of the assignments. The following values are given R1 = 1kΩ, R2 = 2kΩ, R3 = 1kΩ, C1 = 22uF and C2 = 47uF. Is delivers ...
0
votes
1answer
52 views

Working principles of an LDR Light Switch

This is a simple circuit which dims the LED according to the light recieved by the LDR or simply a light switch. Can anybody explain how two BJTs opearete in the circuit, or simply how the system ...
0
votes
5answers
73 views

Is it possible to use a potentiometer as a DP3T style control?

I'll try to be specific: I have an audio application that has 3 inputs and 1 output. The classic answer would be to use a DP3T to switch between the inputs. However, I would like to have a ...
0
votes
2answers
39 views

Control electrical switch through external mechanism

I am planning to control a water tank motor switch through some mechanical means( Since I am in a rented house, I am not allowed to change the electrical wiring for this. And the switch is in the ...
1
vote
1answer
86 views

On/off circuit using photo-resistor (LDR)

I am not afraid of the work but do not know how to do the math to calculate what I need for components. I am trying to create a photo resistor circuit to control some LED model street lights. I have ...
0
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4answers
66 views

Notation on schematic for circuit with n-channel switch

I am designing a circuit with a load that will consume up to 2A @ 5V. I decided to use a slide switch rated at 100mAh to drive an N-channel MOSFET for the (relatively) high current, since a slide ...