Switch Definition and 555 Threads

I am hoping that someone on here can give me some insight on what caused this. I have my idea; however, I would like someone to give their opinion also. At work we have a 13000 volt motor that powers our compressor. How frequent can that size motor be started without causing the motor to...

OK. I have 4 - 12 volt batteries. In parallel is 48 volts and series is 12 volts. I would like have a series/parallel switch for running in 12 volts or 48 volts. Most important, I would like to have a diagram for just how to wire this up. Jeremy

ruh roh http://www.huffingtonpost.com/2009/08/26/microsofts-ad-in-poland-p_n_269366.html I couldn't resist making an animation from the 2 images. Now if I could just make the heads morph...

hey! friends i have to construct a two-ways switch. Can i use a transistor in that case. i means i am constructing a R2R ladder DAC circuit. in that circuit, there is a switch in two ways- originally ground and connect to ref voltage when switch is on. Please suggest me, which device is the...

Hello all, I was advised to use a MOSFET and a comparator together in a solar charger that I am building to stop the solar panel from charging the batteries when full. Seems logical, right? The only problem is I've never used MOSFETs or comparators, so I'm not really sure how to. I need a...

This is a problem i just can't get my head around. When you have a circuit consisting of a "Ideal Voltage source -> Ideal switch -> Ideal Resistance" all in series. The voltage source produces a sinusodal voltage and the switch is set to cut off a part of any rising curve...

Hello, In writting my thesis, I set the spacing to be double spacing, complying the requirements. But in some paragraphs, I need to make the spacing single spacing, as in the abstract. When I write \singlespacing control sequence just before the intended paragrah, it shows no affect. How to...

I wish to attach an LED indicator light across the main power to the 12V battery on my boat. This light will let me know from a convenient location whether I've remembered to switch off the main power. How do I wire it up? The LED is obviously 3V. The light would only be ON if the power...

Hello everybody! I am a beginner in electronics and mechanical but i really want to know more in that field. Now, i want to make a remote control car with a high speed possible. I have already made one with a 3Volts DC MOTOR controlled by a PWM (LM555) and potential-meters, the power supply...

I have a single lighting switch at home which controls two sets of light separately, but I have no idea how it works. Here's what the single switch does when flipped on-and-off quickly, On -> Light A turns on Off -> A turns off On -> Light B turns on Off -> B turns off On -> Light A and...

Hi guys, can u guys help me on this?? I want to design and construct an automatic light dimmer circuit that controls the energy delivered to a 12V or 24V DC light bulb corresponding to the ambient light intensity. The control of energy will be established through switching action to improve...

Hi guys, can u guys help me on this?? I want to design and construct an automatic light dimmer circuit that controls the energy delivered to a 12V or 24V DC light bulb corresponding to the ambient light intensity. The control of energy will be established through switching action to improve...

I am a mechatronics engineer and need to find a stand alone 120v 15amp electrical switch that is programmable. I need it to be able to program a sequence of on/offs for specific time intervals for both on and off. The user needs to be able to hit a start button to initiate the programmed on/off...

After doing some research, I am still confused is a transistor a switch or an amplifier. If it can be used as a switch how do I find the part that will work with the gate voltage that I give it. mouser.com wasn't really helping me in finding the right part.

CNN is just now reporting that Arlen Specter - one of the most senior Republican Senators - will become a Democrat! If Al Franken does assume office for Minnosota, which we expect to happen, that would give the Democrats a fillibuster-proof 60 vote majority in the Senate.

Homework Statement Initially, the switch is in position A and capacitors and are uncharged. Then the switch is flipped to position B. Afterward, what are the charge on and the potential difference across each capacitor? Position a is a 100V battery and a 15microF capacitor C1. Position B...

My geology prof says that no one knows. I think I'll cry if that's true. It's driving me nuts.

I am trying to figure out how to close a simple switch with a microcontroller. Do I need a relay to do this? Please give a simple answer since I don't know much about electronics.

My school is accredited and most of it's engineering degrees are accredited by ABET, but the "engineering science" degree is not. I'm currently 2.5 quarters away from finishing an accredited degree, but a class this quarter has me doing so bad (and the instructor isn't worth praising) that I...

I have almost completed a PhD in a field of computational materials science. I've kinda lost interest in it, and I'm wondering what are some strategies I can use to move to different areas for future employment ...

1. The problem statement The capacitors in the figure are initially uncharged and are connected, as in the diagram, with switch S open. The applied potential difference is Vab = + 210 V. What is the potential difference Vcd? Homework Equations (series) 1/C = 1/c1 + 1/c2 + ...

Why is a double pole switch used after the kwh metre in our houses and not a simple s

Hey guys, I am currently an Engineering Physics student in my sophomore year, however i am having some second thoughts. Basically I am wondering if anyone has had any trouble getting a job with a bachelors in EP or physics? I originally thought i would go onto grad school for astrophysics or...

The following 3 step process refers to a simple RC circuit with a battery and an initially open switch: 1- the switch is closed, allowing the capacitor to charge; 2- after the capacitor has charged, a slab of dielectric material is inserted between the plates of the capacitor and time...

Homework Statement switch statements. y is an integer number. Use a switch statement to set B equal to one of the following values: true, false, or the vector [1 0 1]. If y is {1,2,3,5,7}, then set B to true. If y is {4, 6, 8, 10}, then set B to false. If y is neither, then set B to the...

Hello, I have a switch, which is a normal push button switch. It does not latch. I need to design a simple electronics circuit that can be used to short the switch electronically. Any suggestion? I have tried using a transistor switching mechanism but it is not working properly. Any...

Help! I've got this device that I feel responsible for getting working and I want to test its circuits. It is currently dead. It's this http://www.canadiantire.ca/browse/product_detail.jsp?PRODUCT%3C%3Eprd_id=845524443293144&FOLDER%3C%3Efolder_id=1408474396672427&bmUID=1230269280757". The...

If I wanted to work out the calculations for flicking a lightswitch, what units am I dealing with when I am determining how hard it is to flick the switch? For example, I am sure that I wouldn't say it takes a certain amount of force because a large force over a short amount of time wouldn't...

Hello all, I am stuck in a rather simple, yet confusing quandary.. I'm working on designing a light kit for a Honda side x side utility vehicle. We are planning on drawing power from the back of the existing cigarette lighter auxiliary outlet on the instrument panel, and running the power...

Hi Guys, I need to design something that will isolate our DAQ (Data Acquisition Card) for a basic simulation we need to do. I was thinking about designing a mosfet switch, where the DAQ sends some voltage to the gate above the threshold voltage to turn the MOSFET on and 0 V to turn it off...

So, I have an electromagnetic switch. Which works in this way. A rod has 4 magnets attached to the front of it and 4 magnets attached to the back of it. In the center there is the winding. When I apply current to it, the rod moves towards one end and hits a steel plating on that side fixing...

I am a 2nd year physics undergrad and I am thinking about a switch to EE. I like the thought of grad school, maybe to be an engineer, so I want to know if my undergrad in physics is going to prepare me enough. Some of the upper year classes I will be taking are: (all 1 term classes): E&M I...

Wondering if this is valid to do, if I start with the expression \delta\omega^{u}_{ \singlespacing v} x^v \partial_u where \delta\omega is an infinitesimal, and \partial a space-time derivative, is it still valid to drop and raise the u to obtain \delta\omega_{u v} x^v...

Ricardo, mass 80 kg, and Carmelita, who is lighter, are enjoying Lake Merced at dusk in a 20 kg canoe. When the canoe is at rest in the placid water, they exchange seats, which are 3.0 m apart and symmetrically located with respect to the canoe's center. Ricardo notices that the canoe moved 45...

Keyboard sniffers to steal data

Homework Statement http://img300.imageshack.us/img300/2640/17569077cy5.jpg The transistor is a N-P-N type. When the siren is functional, the resistance of thermistor is 120 ohm. R1 is 600 ohm. The question is "Calculate the collector current if the emitter current is 100mA". I know that...

Hi, I have a switch connected to a motherboard. During ESD test with 8000kV (directly on the switch) the ESD spike caused my system to reboot, and I need some kind of surge protection betwee nthe switch and motherboard. I am not sure what I need to look for? Can anyone suggest a...

I guess all you guys have over active brains, but how do you switch them it off?

I'm currently using this circuit, but without the rectifying portion,a audio source from mp3 player instead of a mic, and a 4V LED instead of a bulb. My power source is 12v. However, the voltage across the LED is only around 1-1.5V. How can i increase the voltage across the LED? Here is what i...

Photovoltaic cell as an "on/off" switch - circuit help Hi all, My first post here. I'm a Mechanical Engineer prodding my finger where it shouldn't be - circuits! I need help and I am hoping you folks can. PLEASE excuse the umb terminology - I don't know this world well! I want to turn a...

Hello folks, I have been trying to make a circuit that would light up an LED when a small solar panel develops a certain voltage. My LED does not light up no matter how I hard I think about the circuit design. I would appreciate any help and suggestions. Thanks to all.

Homework Statement Two resistors, R1 = 8.00 Ω and R2 = 4.00 Ω and two uncharged capacitors, C1 = 0.480 μF and C2 = 0.240 μF are arranged as shown in the figure below. With a potential difference of 21.1 V across the combination, what is the potential at point a with S open? (Let V = 0 at the...

Hello, How do you switch a 3-phase circuit on and off? Is it possible to put a relay on just one leg of the phase, or do you need to somehow switch all 3 at the same time? In industry, what do they use to switch 3-phase circuits, for instance, with a push button start/stop? Christan

Lately I've been haveing some trouble with the Windows Xp on my laptop so I thought about switching to Linux. I use my laptop mostly for programming, writing documents, and browsing the web. Is there any good reason for me not to use linux? I don't want to make a stupid mistake and erase my...

Hi, I've taken apart a touch lamp and remodelled it with my own design. The problem is that now it only works with 50% of the people who use it. The surface area of the switch is much larger than before. Is it a case of replacing a resistor or is there some fundamental problem to having...

how to cure Switch Bounce? is it a good idea to read the key more than once?

Homework Statement Homework Equations Does location of a switch affect current in a simple circuit? The Attempt at a Solution I said no because the switch can be placed anywhere throughout the current

Hello guys, I got a small question. It says circuit consists of three identical lamps connected to a battery with a switch as shown in the diagram. When the switch is closed what happens. I did this really quick on paint. w_w_w_.hotlinkfiles.com/files/1210467_pxtdw/untitled.JPG they are not...

If you have the positive terminal of a battery connect to a switch then to one plate of a parallel plate capacitor and the negative terminal connected to the other plate, what happens when the switch is still open? Does charge build up on the bottom plate of the capacitor only or does nothing...

2 capacitors are connected in parallel to a battery and a switch is connected next to the negative terminal of the battery. If the switch is left open, why does the circuit stop functioning. There is no switch next to the positive terminal, and since the electric field goes from positive to...