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

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0answers
18 views

join between two telephone switches by wireless

I have two telephone switches ,each one has a line cables to the houses , but there is no connection between these switches neither wire nor wireless , how can i join between them wirelessly . What ...
-3
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1answer
25 views

working of Relay switch for driving high voltage ac appliances

Explain the working of relay switch for driving high voltage ac appliances? also explain how it works in embedded system?
0
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1answer
21 views

Connect arduino to COM pin of a NO NC button

I probably have a basic question but i'd like a confirmation on my solution. I have finished my arduino breadboard prototype which is using some basic momentary push buttons along with pull down ...
0
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1answer
46 views

What happens to the output of Optocoupler input voltage is negative

Here is an example of circuit using VIshay Optocoupler 4N25 5V to 3.3V GPIO Output (Inverted) Logic +5V Input ---> 0.0V output GPIO LOW +0V Input ---> 3.3V output GPIO High What happens to ...
1
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1answer
59 views

High Side P Channel MOSFET damaged after turn off

The circuit below is a power switch controlled by a push button. Basically, the switch (Q1) is controlled by a On/Off IC controller. During testing on the real circuit, a DC Electronic Load is ...
0
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1answer
19 views

“Buffering” spikes between switch positions

I'm using a 6 position 2 pole rotational switch to change the resistance of two input voltages. Each position adds a resistor on each input, thus increasing the overall resistance and lowering the ...
0
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1answer
29 views

USB and button power on solution

I've a circuit that have one input pin that should go LOW if one of two conditions is accomplished: USB is connected; Button OR Switch is pressed/slided; If USB is connected Button or Switch is ...
1
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1answer
29 views

Toggle Switch to swap the connections of two buttons

I am trying to mod my arcade stick so I can switch two commonly swapped buttons on the controller. Essentially they are simple 2 terminal momentary switches connected directly to the controller PCB. ...
0
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0answers
28 views

Auto Switch On for Laptop

I have this unused low power laptop that I want to turn into a wireless router and a network attached storage, but unfortunately like some (most?) laptop it doesn't have BIOS option to automatically ...
0
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2answers
24 views

Aux and Microphone to same input

I have a loudspeaker for my car and I've added an aux cord to the system so that I can play music over it. There is also a microphone attached to it and what I've done is add a 3 way switch between ...
0
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0answers
12 views

how do you wire in an emergency stop into 12v [migrated]

just wondering how you would wire in an emergency 'E' stop into a 12 volt or 24 volt Diesel engine?? do you have to wire into the ignition circuit or the fuel solenoid to prevent any chance of the ...
0
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1answer
41 views

light bulb socket which connection to use? [closed]

I am trying to install a light bulb in a socket with 4 connections: P N M1 GND I am wondering which ones to use for connecting a simple 220v light bulb? thanks.
0
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2answers
38 views

Can I use an analogue switch with separate circuits?

I am planning on using 74HCT4066N analogue switch (datasheet) to trigger button presses on two separate gamepads at the same time. The circuit I plan looks something like this: Can I use this ...
1
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1answer
49 views

Timing diagram of circuit involving switch debouncing

I have a push button switch (single-pole double throw) connected to a latch as follows... I was thinking about the timing diagram of the circuit above (above image is the default state of the ...
1
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1answer
122 views

Switching a resistor by software

I want to communicate with a microcontroller over a CAN bus which needs (ideally) 120 ohm terminal resistors at the end of each bus. I want to integrate this resistor into the circuit and activate it ...
0
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0answers
30 views

Automatic Transfer Switch for Boat Motor

I have a boat with an electric motor, powered by 2 12V car batteries in series. I have four batteries on the boat, and on some longer cruises we end up needing to switch to the second set of ...
0
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1answer
42 views

Saving the state of the LED on illuminated momentary button

I have three illuminated momentary buttons with a separate anode and cathode for the led. (source of image) I want a circuit that illuminates the LED of the button that was most recently ...
2
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1answer
94 views

Using NPN BJT with a P Channel MOSFET to switch 3.3V to 24V

simulate this circuit – Schematic created using CircuitLab I have some 3.3V I/O on a PC Board. When an output is switched on, I need to switch the 3.3V output voltage with a +24VDC and ...
0
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0answers
79 views

attiny85: push button not responding or changing switch case [migrated]

I am completely new to C++ programming. The purpose of the program is to change the brightness of an led (ie modes: hi, med, lo) and make sure the led isnt getting to hott. however if the temperature ...
0
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1answer
55 views

Use Arduino(5V) to switch a 3.3V

I have a HDMI switch that I want to control with an Arduino. It's working by pressing a button to change input signal. The button is NC(Normally Close). By pressing the button you break the 3.3V going ...
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2answers
89 views

configuring a DPDT switch to choose between two RF signals

I have 2 different signals coming in I wanted to be able to switch between them (choose what to transmit) using a simple DPDT switch. I have the following configuration, but I feel like I'm missing ...
0
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1answer
64 views

Can a higer-voltage switch be used in my circuit?

I'm playing around with my first circuit assembly on a project I'm working on. It very basic, just three AAA batteries (4.5v) and several LEDs. Everything is working perfectly in a simple, direct ...
0
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2answers
37 views

Interconnected ground planes on signal/component-layer

From what I understand, RF- and microwave-circuits needs separate ground planes to avoid coupling between signal and DC/digital currents. I'm currently involved in an RF-project where we're going to ...
0
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1answer
71 views

How do you construct a dual-input switch using transistors?

I have part of a circuit that I wish to disable power to depending on two input signals (digital, active low). How do I realise this, preferably using transistors? Application The two signals comes ...
0
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3answers
63 views

Power switch placement

When building a circuit, are there any conventions as to where the on/off switch should pe placed? As in between the negative pin of the battery and ground, or between the positive pin of the battery ...
0
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0answers
45 views

PIN Diode T-R Switch for use with RF Power Amplifier

I would like to use PIN Diodes to actuate the T-R switching of my RF Power Amplifier, however, I am having trouble understanding the proper way to accomplish this. I would rather use a solid state ...
0
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0answers
22 views

Switching power supply of a modem with a microcontroller

I want to measure the power consumption of a modem in a certain scenario. Modem can drive current maximum 2A. The scenario is that, every 5 hours the microcntroller will turn on the modem power supply ...
0
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4answers
107 views

Optimize PNP/Diode Schematic

I am trying to design a circuit which has four switches, numbered 1-4 as in the diagram. The circuit should function such that closing switch n turns on light ...
0
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1answer
36 views

Modding a doorbell to a transceiver but need timer

What is the best way to accomplish adding a switch with a 5 second 'on' feature (where the circuit is closed for 5 seconds then opens thereby turning it off)?? I was thinking of using a digital ...
1
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1answer
53 views

Mosfet won't turn fully on

I have a IPB011N04LG N channel MOSFET configured as a switch in the following circuit: It works, but doesn't turn fully on. If \$V_{\text{BAT}}\$ is \$23\$V I get \$11\$V on the load side If ...
0
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1answer
36 views

ic relay.. is there any delay for the responz of <İC insıde the circuit

Regarding SPDT ic relay TS5A3157. Do we have a delay responz inside the İc/ do we have a click sound. Because im startıng for a new project that can switch wireless, bluetooth or ir. What i need on my ...
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1answer
53 views

Semiconductor SPDT-switch - use outputs as inputs?

Can the outputs of a semiconductor SPDT-switch be used as inputs if I reverse the switch? I can't see why it shouldn't work, but I though I'd ask anyway.
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2answers
45 views

Lighted SPST switch waiting problems

I am trying to put together a model rocket launcher for my son and am having issues with wiring. He wanted it to look "cool" so I have two SPST switches that light when powered, and a single SPST push ...
0
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0answers
30 views

Controlling a three-wire valve via µC and transistor-based SPDT

I am building a garden watering automation thing. An MSP430 controls a 12V three-wire motorized ball valve (CWX15Q CR-02). One wire is GND, one is OPEN and one is CLOSE. Now I need a circuit to ...
2
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1answer
298 views

Why use a N channel MOSFET as high side H bridge switches?

I've seen N channel MOSFETs as high side switches of H bridges quite often, which requires a charge pump to drive. Wouldn't a P channel MOSFET be easier, simply isolating the microcontroller command ...
0
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0answers
31 views

Confirm my suspicions about astable 555 “always on”, dumb mistake?

got a astable 555 timer schematic here, worked fine with a through hole NE555P when I didn't add the switch to pin 4. Now, in my SMD NE555PSR, the pulse is simply always 'high' or always 'low'. Am ...
0
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2answers
53 views

Latching switch turning back to off on power loss

I can't twist my head around the proper use of my latching switch problem. In detail, the latching (or maintained) switch should switch a 48V DC source power supply for a cisco router. The 48VDC power ...
0
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0answers
26 views

Issue in SPST Switch IC adg1401

I am using ADG1401 IC for my application.. I have given +/-5V Supply for the IC... I used 100k pull-up resistor in the IN pin... And I have given a 3V 10Khz Sine Wave as the input signal...I'm ...
0
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3answers
39 views

Why does switch change parallel current after junction?

This is an image demonstrating the use of a pull up resistor. I've just started studying electronics and have been learning about ohm's law. Ohm's law says that current within a circuit is equal to ...
0
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2answers
35 views

Will a I2C switch boost the overall bitrate?

I am currently working with a wired I2C bus system consisting of 6 individual bus lines with 4 slaves on each. They are currently all connected to one I2C bus and for each slave i add the bus becomes ...
0
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0answers
72 views

Voltage divider biasing circuit switch, which resistors should I use?

Goal: To turn on (open) a solenoid valve valve for irrigation when the soil moisture sensor reports a value below X% and shut it off (close) above X%. X should be able to be changed between say 20-80% ...
0
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0answers
69 views

Transistor switch help

For starters this is the circuit I have made. I don't have the same relay board, but it is active low. My problem is it seems my PN2222a transistor seems to be leaking current when the base signal ...
0
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0answers
88 views

Simplest way to switch between power sources?

As I mentioned in another question, I have a battery charging setup where currently AC power feeds a AC-to-DC power supply which outputs 48VDC to a battery charger. The limis for the charger are: ...
0
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1answer
68 views

LM311 Current Sensing Switch

I need to create a current sensing switch and am looking for ideas. I have very little experience with op amps / comparitors (as you'll see) but this seems to be the way to go. I am monitoring 24VDC ...
1
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2answers
220 views

Make-Before-Break Relay with Very High Continuous DC Current

I need to use a relay in order to do field sweeps with my electromagnet, which is hooked up to a couple very beefy monopolor power supply. (My magnet's impedance is ~2 Ohm, and I am putting ~40 Amps ...
6
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4answers
1k views

What is a push-up/pull-up resistor? [duplicate]

A.S. The question A question on pull up resistors answers only a part of my question as already mentioned in "EDIT" made shortly after this question was asked & answers here (below) are much ...
0
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1answer
47 views

Control connectivity of resistors in voltage divider arrangement

I am building a device to measure the resistance of a resistor using a voltage divider. I added multiple resistors so that the range of the divider could be changed by switching to another ...
0
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2answers
44 views

25V for PMOS switch VGS?

In a load supply using P-MOS, the input to source is 25V. We found unfortunately that the MOSFET we chose and soldered has only 20V maximum gate-source voltage. Although there are voltage dividers ...
2
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2answers
77 views

2 LED Parallel circuit help?

I need to make a circuit with 2 leds, 1 green 1 red. If the current flows, green led will light up, if there is a break in the circuit (open circuit) it will light up another led as red. I don't ...
0
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2answers
61 views

Alternating between two LEDS using BJTs and SPST Switch

I made a circuit based on this post, Alternating between two LEDS using BJTs. It seems to work in the simulation just fine but when I'm connecting it with real components, I get funny behavior. ...