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

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53 views

How exactly should I build a smart wall light switch for a smart home

I'm planning to build a smart home system and as you know smart wall light switches are a important part of it. I've been digging around for almost two weeks but still couldn't find what I'm looking ...
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1answer
158 views

AVR switch best practice

After reading a lot of posts (here and on the web), I am a bit confused. All I want to do is to get the best practice of push button connection to AVR. I have 2 "sections" to my question. the first ...
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1answer
22 views

When wiring an anlogue switch to grounded button, which goes to Y and Z?

I'm wiring an analogue switch (74HCT4066N) to throw a grounded switch. The datasheet says that the recommended Vsw value should be between GND and Vcc. This means that it's important which of Y or Z I ...
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0answers
29 views

Switching low-voltage AC signal from microcontroller

I have a 5V 10MHz AC line which I need to turn on/off from a microcontroller. The microcontroller will be powered by the same input signal (through rectifier). What is the best way to do that?
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0answers
42 views

Overriding Mechanical Switch with GPIO

I have a mechanical switch that sends a current (~5Vdc) into one of two wires. simulate this circuit – Schematic created using CircuitLab I would like to add circuitry which can override ...
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1answer
320 views

How not to waste power with digital inputs?

I am trying to make simple gates with n-MOSFETS, yet I'm not sure how to actually do physical gate inputs correctly. At first, I tried this (a single-pole, single-throw switch from +5V to gate). ...
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1answer
20 views

Need to control 100 Watt Pump With 15 Watt Float Switch

I am an inexperienced hobbyist So My Question may be obvious, but thank you for the help. I have a 12 V battery, which is powering two 12 V pumps. It is a 100 W pump which runs at 7 A on average ...
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0answers
27 views

Switching between batteries while charging

Let's say I have a 4 A current source and two 12 V car batteries, connected in series (with a tap in the middle). What in your opinion is the simplest MOSFET switching circuit, that would allow me to ...
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1answer
32 views

liquid level switch and solenoid valve circuit

I am trying to make sure that I have this circuit hooked up right before I actually put it to use. I’m planning to use the liquid level switch (McMaster PN:50195K93) to open the solenoid valve ...
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1answer
64 views

Parameters when choosing a relay

Is this a good circuit to use as a air condition switch with a help of microcontrollers 5V? What relay to use in this situation? What parameters should I take into consideration when choosing ...
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2answers
22 views

6v switching large load

I'm looking to build a remote firework launcher. I'm using parts from an rc car for the remote, but I need a circuit that can switch a large current (~2-3amps) with 6v. Can I do this with a ...
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0answers
11 views

Can two HDBaseT receivers share the same line via an RJ45 splitter? [migrated]

What I'm trying to accomplish: Allow two HDBaseT receivers to share a single Cat6 Ethernet line via a splitter. IMPORTANT: I AM NOT ASKING FOR PRODUCT RECOMMENDATIONS. I'M ASKING IF HDBaseT ALLOWS ...
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2answers
79 views

Modeling long wires in circuits

What's the proper way to model really long wires in circuits (18ga, ~1500 ft)? I'm aware that over long lengths start to accrue non-ignorable resistances. I'm wondering if they start to get other ...
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1answer
61 views

Transformer and a relay in series - but function like in parallel, but not exactly

I've been doing some planning to build a home automation system on top of the existing power infrastructure of my house. The first thing would be making my light switches smart. My original plan is ...
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2answers
94 views

Connecting a switch and a MOSFET to an Arduino?

I have an LED strip that I am trying to turn on with a magnetic switch when a door opens. I want the LEDs to fade on when I open the door and fade off when I close it, which is where the Arduino comes ...
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1answer
101 views

Basic transistor switch

I'm just an amatuer working with some electronics at home. I am trying to use an NPN transistor as a switch. 9v on the Emitter, 6v as the control on the Base to activate the switch, and I'm going to ...
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1answer
104 views

Design an E-switch

I'm trying to run a OLED display densitron with a ssd1322 controller. It requires basically two supply voltages 15V VCC supply and maximum 3.5V Vci supply voltage for operation and IO pins. There is a ...
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1answer
26 views

Rotary switch Failure Mode “Improper Output”- What are its effects?

I am doing a FMEA for my Rotary Switch. It has two Failure Modes (from FMD-97). Improper output & Contact Failure. I want to know what would be the effects of "Improper Output" Eg:- My switch ...
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1answer
51 views

Help with coreless micromotor. Can I add a switch?

I have ordered some coreless micromotors, as shown here. These are for a science club for the kids to tinker around with. We are simply using them to make lightweight cardboard junk robots jiggle ...
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0answers
29 views

Momentary switch (on High Beam only) for auxiliary driving lights

I have been scratching my head on this topic for some time. In summary, I fitted a OEM auxiliary light switch (momentary) to my vehicle with the intention of using this to power my spot lights. So ...
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1answer
39 views

Most efficient two-way switch relay and/or schottky (or..)

Scenario: On my old military Land Rover I have a three-way pole switch which turns the pilot and tail lights on (top position), or also turns on the headlights (bottom position). Top: Pilot and rear ...
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2answers
62 views

Driving an AC motor using transistor as a switch

It's pretty straightforward to use transistor as a switch while working with DC voltage. But I am faced with a situation to switch on/off an AC motor (single phase). Is it absolutely necessary to ...
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4answers
131 views

Toggle state between two circuits with two momentary switches

I have two circuits each with their own 1.5v power supply. I would like to toggle state between the two circuits with a switch, so that hitting a momentary switch turns the light off on one and turns ...
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2answers
101 views

does half bridges ICs exit?

i can't find any half bridge ic (with integrated fets) for low power (2w around 12V), all i find is full bridges for the same power magnitude. and i don't even find them under the name of full bridges ...
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3answers
30 views

Reducing parasitic capacitance in momentary latching circuit

I'm using this circuit (http://www.edn.com/design/power-management/4427218/Latching-power-switch-uses-momentary-pushbutton) to get latching on/off behavior from a standard momentary switch (an Omron ...
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1answer
82 views

Relay or Transistor for DC Resistive Load?

I'm building a circuit that includes a resistive load that I have to switch, which is going to be supplied with ~200 VDC and 0.1 Amps. I've looked at different mechanical relays, and typically they ...
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1answer
41 views

Reverse current protection on power-switching MOS

It was suggested in "Select power supply voltage using MOSFETs" that a second MOSFET can be added in series to prevent reverse current flow. My question is, can I just reverse Drain and Source on the ...
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1answer
50 views

24V proximitiy switch, NPN transistor, Arduino interrupt input

I build circuit which take proximitiy sensor as input to circuit (24V). With this 24V we switch on and off NPN transistor. On the side is Arduino with interrupt enable when pin is LOW. So I need ...
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2answers
41 views

What type of switch am I looking for?

So I am making an audio switch, and I need a switch that takes 3 dual inputs and outputs one of them, or vice versa, taking one dual input and outputting it to one of three outputs. It needs to be an ...
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2answers
47 views

How to read decade counter with minimum pins

I just obtained some of these counters for a project: They have five connections for each slice labelled C, 1, 2, 4, and 8. As you increment the digit, the pins for the appropriate binary encoding ...
0
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1answer
23 views

quick question about AC SPST rocker switch

I'm replacing the motor control switch in this toaster and wanted to be certain about how it should be installed. It's a normal SPST neon rocker switch with A, B and C for terminals, and B-C being ...
0
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1answer
85 views

Coffee machine wiring diagram

First of all I am a beginner in electronics / electricity. I am currently trying to connect a coffee machine to a Raspberry Pi powered relay. No problem with that, but as I am going to put apart and ...
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2answers
36 views

Drum trigger controller

I'm planning to make a drum controller (something like arduino) for pc using a piezo transducer as sensor, some electronic circuit, keyboard PCB connected to usb and sampler for drums in pc. I found ...
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4answers
70 views

Inerfacing switch & led with any controller

I am trying to interface switch and led. I want to write a program in which if I press and release the switch led should glow and if I again press the switch led should turn off. I am not able to ...
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2answers
54 views

controlling a DIY spot welder with a momentary push button switch?

I have a 240v to 12v transformer even bigger than a microwave transformer and i want to control how long it is switched on for in the range of 50-300 milliseconds to spot weld things. I was thinking ...
0
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1answer
51 views

JFET Audio switch, does not work in simulation?

This is a circuit I've found online and apparently it is taken from the very rare audio book by National semi. The circuit is used to switch a signal on and off at a transition time that the user sets ...
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1answer
41 views

Is there a pushbutton that does what a latching relay can do?

Is there a small (around 1 cubic inch) pushbutton that does the same function as an NVR (No Voltage Release) switch or a latching relay? Functions needed: -Must press button when circuit loses ...
0
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1answer
64 views

Help with On/Off Flip Flop Switch

I'm still fairly new to electronics and have been teaching myself as a hobby. Currently I'm working on a project that detects a red laser beam, and once detected will turn AC lights OFF if they're ...
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3answers
60 views

Protecting complementary MOSFET switch

I have a complementary MOSFET switch that turns ON/OFF a DC voltage offset of 2.25 V that is provided to another circuit. The switch is controlled by a digital signal, Vctrl, from a PIC18. Simulation ...
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2answers
32 views

Circuit with switch - express the current for different times

Consider the circuit below consisting out of a capacitor C and two identical resistors R. For \$t<0\$ the switch is open and the capacitor is uncharged. At \$t=0\$ switch is shut and the circuit ...
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1answer
47 views

Good way to switch AC/DC (Rectifier) in welder

I am building a homemade welder out of microwave oven transformers. I would like to have ideally an on off switch and then an AC/DC switch or just having one switch would work too. AC 120V 60Hz ...
0
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1answer
57 views

Z80 Binary Front Panel Design

Hello fellow engineers, I need some design design help with a Z80 based computer I am building. It will feature a binary Front Panel. The following functions may be performed via the front ...
0
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2answers
48 views

Two limit switch signals affecting each other

I'm trying to make circuit which will allow me to sense some platform presence at the ends of some rail. I'm using the limit switches, here is schematic: SENS-* signals connected to MCU pins, that ...
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2answers
35 views

Load switch correctly wiring

I need to use this load switch http://www.semicon.toshiba.co.jp/info/docget.jsp?type=datasheet&lang=en&pid=TCK106G . This load switch will be controlled by an MCU. Since at startup MCU have ...
0
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1answer
50 views

Substrate Connection when driving a Bi-Directional Switch

I am very confused about the way the below circuit functions. Below is an excerpt from a research paper which shows two NMOS transistors connected such that the body diodes face each other back to ...
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2answers
81 views

LED and light bulb in series

I have this electrical system: a switch connected to a 120V 60Hz 21W light bulb. I wanted to add two outlets one for a LED, another one for something else like a laptop or a fan. I tried to plug in ...
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2answers
128 views

How a transistor works?

I know this question is asked a lot and answered well in many posts, however, I'm still confused. A switch transistor works by using a semiconductor to pass the current from an emitter to a ...
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2answers
88 views

Need a switching device. Should it be a relay?

I am trying to build a system where first i would charge the battery (3.7V,40A), and then discharge it through a high wattage Resistor. For this purpose i will be connecting a power supply (15V-50A) ...
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1answer
20 views

Operating flow switch on a DC voltage

I plan to buy a low flow switch for my heater protection from Mcmaster (2371K4, 0.1GPM set point). The catalogue says that the switch operates on 120/240VAC supply. Would this switch be able to ...
1
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0answers
41 views

Low-noise SPDT switch

I need to produce an extremely low noise SPDT switch. This switch will take two different inputs to a single 16 bit ADC. The inputs are 50 ohm BNC outputs from trans-impedance amplifiers. The ...