Switch Definition and 555 Threads

I'm replacing the motor on my old Logan lathe. The old motor was pretty simple, it had four wires; two to run and two for the starting coil. I can't seem to figure out how to wire up the reversing switch for the new motor. Here's the plate on the new motor. The drum switch I have is like...

The statement is: Find the currents of the circuit after the switch S is closed. I solved it by EDO (ordinary differential equations) and then I tried to solve it by Laplace and they gave different answers.

I have a question regarding a light fixture I'm building that also has a motor in it. It has geometric shapes that spin slowly around the light (almost like a mobile) and this is what I'm using the motor for. The light fixture will be attached to the ceiling like any normal light fixture or...

Hello, first of all, I would like to apologize if this type of question has been asked too many times and has made people bored. But this question really affected me to the point of depression. So I thought some kind but realistic people here could give me really sensible advice and I decided to...

Initially the current is non-zero therefore we have a magnetic field present, and at the end there is no current therefore there is no magnetic field present. When we open the switch, and the current drops to 0, there is a change in the magnetic flux of B, as the field from A has gone. This...

Hello I'm booting from 8.1 Knoppix usb and want to switch the language settings from German to UK English but don't know how. Thanks

Hello there, I am Mufeez. I am currently enrolled at QAU in the field of zoology. Didn't plan to study zoology so I am gonna drop it and try to move towards my main interest that is physics. Joined PF to learn physics and get help and make connections. Hope ya'll have a good day.

As far as I can tell there are three circuit states that control the recliner foot rest, raise it, lower it, and off. How is this wired, how does the switch function etc...? I assume the up and down switch flip the polarity across the motor, but that is all I can seem to reason out...

Is there any compact electronic component used to make a switch that can withstand large currents from a series of capacitors connected in parallel with a total voltage of over 600V?

TL;DR Summary: I need to calculate Vout when the switch Is closed and open. I need to calculate Vout when the switch Is closed and open. Is my work correct?

I need a row of switches, about 30 to be exact and the idea I need is to have a "moving OFF position" much the same way a "LED chaser" works where you have a moving ON position. Only unlike in a LED chaser where one diode comes ON at any given time and the positions changes continually to...

I have a machine that when operator presses button, it will move upwards. When it gets to the end position, a switch is made and that causes a double acting pneumatic cylinder to engage... pushing a pin into a sort of "Dead bolt" safety position.. to lock machine in place. Operator then does...

My Next DIY, So, I'm guessing something like this may already exists (see image) light bulbs added for clarification purposes only. Anyone know if there's something like this already on the market? So, I did a google search for custom toggle switches but most if not all were for Marine or...

You can find the impedance for each of the three positions with V/I. However I'm not sure how to find the inductive and capacitive reactance. Thanks for your help.

I'm certain these must be common in automotive applications, but I'm just not sure what search terms to use. I'm looking for an on/off switch (to be electronically sensed, so low volt/current) that can be connected to a water pipe, and turn on/off at around 1~2 PSI. The specific application...

Hi, First off, I want to say that I'm basically a noob when it comes to electrical engineering; I have some knowledge and took an intro to robotics course in college, but if I knew the answer to this question, then I wouldn't be here asking haha. So here it is: From what I know, relay...

#include<stdio.h> #define MAX_SIZE 6 int pop(int a[]); void push(int a[],int e); int pal(int a[]); int *top; int stack[MAX_SIZE]; int main(){ int choice,done=0,ele; printf("1.Push\t2.Pop\t3.Pal\t4.Exit\n"); printf("Enter your choice:\t"); scanf("%d",&choice); while(!done){...

Hi guys , I've been trying to think this one out but I'm drawing a blank. What I am able to understand that I'm required to calculate the backwards emf when the switch is opened. The current through the resistor R1 is 9mA. I was wondering if 9.2mA is even possible? Can the current exceed Imax...

I have a switch home that is not easy to press and sometimes if I forget to press it hard enough it will stay in the midway for a few seconds but I always push it to ON or OFF soon. Could this cause any problem to my electrical or electronics appliance?

How do Mathematically Ramp down a sinewave to 0 or switch frequencies without causing a clicking sound? I wrote code to play a sinewave but when I stop the sound I can hear a clicking sound. I tried to slowly ramp down the Amplitude, but that seem to only work for some Combination of...

Sometimes, not always though, it was my problem, not the switch is defected, I didn't press it firmly, the switch will leave in its mid-way, but it is supposed to be either ON or OFF. What is the possible problem of doing this? Will it burn the switch or cause even more severe problem?

Hello, I am wondering why a wire that was connected from a MAIN BUS BAR to the top side of a switch and when turned ON burnt immediately and the wire connected from the bottom side of the switch to the BUS BAR needing power slowly burnt. I'm thinking the wiring was reversed- Correct me...

Ok so here is something that made me scratch my head and I still can't come to a final conclusion. The basic idea is seemingly simple. You have permanent magnets attached to a core, the field lines close on both magnets through the core, so far so good. but the core also has electromagnets , put...

A post doc in an area that differs from my PhD? I am currently doing a PhD in fluid mechanics but want to do mathematical physics tbh. In another thread I got an answer about a user who had done a PhD in accelerator physics and went to do a post-doc in condensed matter, vice versa even, but in...

Does anyone know of any products that would allow me to install a battery operated light switch and ceiling light? This would save me a lot over tearing down all the sheetrock, replacing sheetrock, painting, etc.. I'm thinking a switch with a faceplate. A simple button cell would go behind the...

When the energy of the capacitor is minimal it has no charge therefore the voltage on it is 0. That means that the voltage on the inductor is 0 as well at the moment. The part that confuses me is: why isn't the correct answer 0? How can a voltage change in a single moment? Furthermore I am...

I recently came across a Diaphragm flow switch whose operation many engineers are not familiar with. First. Supposedly in a normal pressure switch. The pressure will be a maximum when there's no flow, precisely because at zero flow there is no pressure drop anywhere in the system, so the...

Could someone please help. i need to connect a 12vdc motor which can draw 16 amps to a switch that has an led on it. the led is rated at 3v 20mA. The power supply i am using is rated to put out 12vdc at 30A I thought of the possibility of adding a resistor to the positive pole of the led. In...

In a house (USA) there is "combination switch" ( e.g. https://www.acehardware.com/departments/lighting-and-electrical/switches-outlets-and-plugs/switches/3235199?store=16359 ) containing 2 two-pole switches. [Edit: correction: 2 single pole switches]. The electrical diagram for the circuit...

hi can anyone here recommend an alternative relay switch x2 one has 5 legs one has 4 im not able to find any the same :( and the ones I've looked at all have 5 legs the diffrece is Ronway RWG1-DC12V-HS and Ronway RWG1-DC12V-ZS Any help is appreciated :) hs and zs is the only diffrence i can see...

My home water heater is messed up. If I want to reset the circuit breaker for it, which should I turn? There are three: 1.) garage (where the heater is located) 2.) water heater/dryer 3.) heat pump

For an ideal battery (r = 0 Ω), closing the switch in (Figure 1)does not affect the brightness of bulb A. In practice, bulb A dims just a little when the switch closes. To see why, assume that the 1.50 V battery has an internal resistance r = 0.30 Ω and that the resistance of a glowing bulb is R...

(.174A-.181A)/.181A=-3.86% but it says it wrong, and I did (.181A-.174A)/.174A =4.02% but this was wrong too. I've tried 3.87%,3.86%,-3.87%,-3.67%,4.02%, and -4.02% but all were wrong. I'm really not sure what to do here.

I know how to calculate the power output and input by analyzing the current in put and output with multimeters and using the formula P=VI. But P_out is obviously incomparably smaller than P_in so the efficiency would suck this way. Is there a better way to do this??

Hi all, I am a first year student at the University of Notre Dame, and I will be choosing classes for first semester second year in a week or so. I am currently a physics major, but am getting anxious as the time to “commit” approaches. I came in not knowing what I wanted to do as a career...

You see this symbol on power switches, but what does it really mean? From https://en.wikipedia.org/wiki/Power_symbol, But the switches that I've seen the symbol on doesn't cause a "sleep mode" but powers the device on and off. ... Grrr

Hi All, I am just trying to understand a circuit but cannot figure out the meaning of the following symbol. Did not get very far from googling electrical symbols. The symbol is given below. I know it is a switch but what does "x" mean on one of the wires and what do the half sine and square...

I need to protect electronic parts in case from water. The thing is, I need to design slide switch on the cap of the housing. Maybe any ideas?

Does anyone have internal schematics (or illustration) how this thing work inside? Like how water flow can activate the conduction to the two wires connected? https://www.amazon.com/dp/B01MU3KQCD/?tag=pfamazon01-20

I read everywhere that gravity is slightly stronger at the bottom of a mountain than at the top because the place is closer to the celestial body that causes the "attraction". What I don't understand is that, as you get closer to the center of the planet, there's less matter below you and...

Hi I’m making a custom lamp for a Christmas present and want to create a custom on off switch to go with it. The switch part is easy, just make a mechanism that breaks or completes a circuit, but I’m not sure what to do to insure it doesn’t electrocute the user, or burst into flames. If I...

i am planning to measure the back emf produced by inductor when you open a switch. i know it is very hard to predict the voltage. but is there any way to narrow the possibilities?

I have a socket on the wall , because of the size of the adapter, the switch on the socket is always stayed between "ON" and "OFF" while it serves and works. From the electrical point of view, is it a complete circuit inside? is there any partial complete circuit which may be a problem?

Hi, For my next computer I either want a PC running OpenSUSE for coding and Ubuntu for gaming. I can code C++, Python, and Swift. I know that for Swift development you need a Mac computer. There's just no other way to code swift other than getting a Mac and XCode. But I know that Linux is pretty...

I already did part a and got the correct answer of 4.8 microC. However, I am unsure how to approach part b, where the switch is closed and apparently the two capacitors end up with different charges. For part b, since there is a path between the two capacitors, I don't know if I am able to...

To cover transformer loss at no load and maintain pf, we are needing 6kvar at day time and 9 kvar at evening. Is there any time based switch available, such that it can switch ON 3 kvar at evening, say 8:00pm and turn off automatically at 8:00AM morning

I have a linear actuator that raises and lowers my snow plow blade and the wireless remote stopped working. Rather than order a new one for $200, I decided to splice into the wiring and put a momentary switch in my truck. I didn't like the remote anyways. I grabbed some wire and wired up a...

Hello the first image with the letters going ABCD is picture #1 and then BACD is picture #2 for references. Tools: - Normal magnet. Nothing special about them. - And we will say they have some type of system where they do not move sideways. Only up and down and have a difference of 5 cm when...

Like many of you, I have always enjoyed physics and math throughout high school. When applying to universities, I was quite unsure about my goals, so I applied to both engineering and science majors. I have always been deeply fascinated by astronomy, but I enjoyed environmental science as well...