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

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3answers
34 views

2 led on latching pushbutton NO arduino

I am looking to push a button and one led comes on when i push the same button again the first led goes off and the second light comes on. alternating lights each time the button is pressed. one ...
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0answers
19 views

wireless on/off switch for LED using RF transmitter reciever

i wanted to switch on an LED using an RF transmitter receiver like we can see in this video (https://www.youtube.com/watch?v=jeRtyOgf0mI), although i do not want the morse code application, i just ...
1
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1answer
19 views

Averaging switch sensor value

I have a float switch that has three possible positions- open when above the water level, closed when below the water level, and rapidly opening and closing (freq~=0.1s) when its near the water level. ...
0
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1answer
26 views

Error interfacing GSM with Atmega32 using UART Interrupt?

I am interfacing GSM with atmega32 using uart interrupts. I am using an external interrupt which is fired when a user press a switch and uart receive interrupt to receive the response of GSM. CODE: ...
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0answers
29 views

Switch Mode power supply and ADC measurements

I've got a controller, measuring on 4 channels, but I see the (~50mVpp)ripple of the power supply, when I oszilloscope the ADC pin. The adc values jump around too. I tried to add an LC filter, but it ...
1
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2answers
62 views

How can I detect which DC power source to send to an underwater camera housing?

I have a small problem and hoping someone can help: I am trying to design and build a reasonably universal underwater housing for some different cameras. there is a breakout box on the surface and ...
0
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0answers
20 views

hall effect sensor as a toggle swich for a 12v strip of LEDs

I'm trying to use a unipolar hall effect sensor as a power switch to turn off and on a 12V strip of LEDs, powered by a 12V 6.6Ah battery. I just tested the current draw of the LED strip with a ...
1
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3answers
92 views

Transistor as a switch

I am having a tough time here.I want to design a simple transistor switch (obviously operating in saturation) using 2N3904.I want to switch a current of 10mA. The part in yellow rectangle indicates ...
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2answers
76 views

How to emulate a switch on power line

I have a circuit with two DC power lines coming from BAT1 (1A) & BAT2 (2A) (two outputs of a power bank). There is a sliding switch on the power line of BAT1. I would like to keep only one switch ...
2
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3answers
244 views

Where to place debouncing circuit for remote mounted buttons and rotary encoders

I have an application where a push button and mechanical grey-code rotary encoder(user inputs) need to mounted away from main pcb. 24" - 48" away. This is for space and packaging reasons. Is it OK to ...
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1answer
75 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 ...
1
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1answer
160 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
23 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 ...
0
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0answers
33 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?
0
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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 ...
1
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1answer
321 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). ...
0
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1answer
21 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
29 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 ...
1
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1answer
36 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 ...
4
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6answers
221 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 ...
0
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2answers
25 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 ...
4
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2answers
80 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 ...
2
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1answer
64 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
99 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 ...
1
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1answer
104 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 ...
0
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1answer
107 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 ...
0
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0answers
31 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 ...
1
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0answers
33 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 ...
1
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1answer
40 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 ...
0
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2answers
65 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 ...
0
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4answers
134 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 ...
0
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2answers
103 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 ...
1
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3answers
31 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 ...
1
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1answer
85 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 ...
1
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1answer
46 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 ...
0
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1answer
56 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 ...
0
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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 ...
1
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2answers
49 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
24 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
86 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 ...
0
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2answers
40 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 ...
1
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5answers
98 views

Inerfacing switch & led with any controller [duplicate]

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 ...
0
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2answers
56 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
54 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 ...
0
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1answer
42 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
68 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 ...
1
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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 ...
0
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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 ...