Troubleshooting Definition and 330 Threads

SO I ordered the axe026 serial preograming cord to use with my picaxe 08m2. To plug it into the usb I am useing a usb to serial converter. But it's not working at all! I know my program is right but do I need a special driver? I downloaded the driver for the 026 AND 027, neither are working

Hello, I am trying to make an audio amp on my breadboard, for fun I guess. But it's not working! I am running off of this circuit of the lm1875...

So I want to make a solar usb charger but am having some problems that i do not understand. I know that usb is 5v at 1 amp-ish and so I took 4 rechargable AAs and was getting just over 5v. I want to have the solar pannel charge the batteries when there is nothing being pluged into the usb...

I have a question about how to use "noparse." I stole the code from one of MarkFL's recent posts. Here's what I am trying to do, but it's not supposed to carry out the line commands. I don't know why it isn't working. f(x)=\begin{cases}1 & x\in\mathbb{Q}\\ 0 & x\notin\mathbb{Q} \\...

I have a old stereo that I am repairing. Its a old MacDonald Am/FM/ Mpx. The problem is, it operating on Fm mono. Even on Mpx. I''ve checked ever thing I know of. But the Stereo light will not come on. I've read every book on it. But I can't same to find the problem.

I was just on a thread and I noted that MarkFL's \bar operator didn't look quite as nice as using the \overbar operator. It worked for me when I first tested it in the thread, but when I posted it the tex box gave me \overbarAB ie. \overbar{AB} Since it worked for me the first time I can only...

I searched for this but couldn't find a sol. when entering the code for sets i.e. \mathbb{N} I get this error message: ! Undefined control sequence. <recently read> \mathbb l.32 $\mathbb{N}$ The control sequence at the end of the top line of your error message was never \def'ed. If...

Just recently my laptop (6 years old now) is starting to deteriorate in performance quite a bit. Applications are running slow, shockwave applications embedded in browsers are crashing from time to time. There's quite a bit of rubbish that has been installed on the machine over the years that I...

I want to build my own circuit sensor. I opened the digital scale.I built the circuit on breadboard.The sensor is silverish color in the picture. I have completed my circuit on breadboard but don't know how will this sensor work. Can someone tell me what is the mechanism of this specific...

Hi, I am making a capacitor with Aluminum plate and Mylar film. Al plate surface has tiny groove arrays, each groove forms a cavity and the mylar film is sitting on top of the groove to allow its vibration under input AC voltage. I am putting in AC of ~300Vpp with frequency of 60KHz. The AC...

Need some ideas on how to debug a POR issue - I have 2 major ICs on my board - MCU(atmel) and Ethernet switch(DM8603). The reset(active low) comes from the PGOOD pin of a DCDC converter(sic403). DCDC output is 3.3v, input is 5V. Pgood pullup resistor is 10K. When the reset is given from...

Hey guys. I am trying to simulate some circuits in MATLAB's Simulink, and I always get some weird graph which is not sinusoidal at all. I wanted to know if anyone could tell me which block am I missing if I want to get a good sinusoidal wave. Here are the pictures of the circuit and the...

I was wondering if there was a simple program out there that would help me design and toubleshoot schematics I draw? For example, I have a schematic for a power supply that takes a 6.5k "core and coil" transformer and ups the voltage to 15k to supply a Van de Graaff generator. Now, the problem...

A 20.0kg sled is being pulled across a horizontal surface at a constant velocity... Hi. This is a problem on my physics homework that I can't seem to get the (correct) answer to. I would love to be told what I'm doing wrong. (: This is a problem and what I did: A 20.0kg sled is being...

So I am making a module to run in the main program. The module contains a subroutine and several functions. I want to call one of the functions into the subroutine but it is not getting recognized. I am just doing Real :: fct %fct is the function name that returns a real value but when...

please help me with a c code for the merge sort... and i am getting a segmentation fault in running this selection sort,,, please help... #include <stdio.h> int main( ) { int arr[10]; int i,j,temp; for ( i = 0 ; i<10 ; i++ ) { printf("enter the numbers: \n"); scanf("%d \n", arr[i]); } for (...

Hi, I want to align several equations in latex. I want the first and second equations to be in the middle. The last equation is too long and I want to split it into 2 parts. I tried \begin{gather} Eq1\\ Eq2\\ \begin{multline} Eq3a\\ Eq3b \end{multline} \end{gather}...

I bought an ipod nano on ebay and the headphone jack is messed up. When I first got it, I was testing it, but it eventually wouldn't come back on, so I assumed it needed charging. I plugged it into the adapter on my computer that plugs into the ipod's headphone jack to charge it. I noticed it...

Hi! I'm doing my master thesis about designing a offshore wind turbine tower for subarctic conditions and I have a major problem with units I'm not much familiarised with Ansys, so I use Ansa as preprocessor and launch the solve in Ansys The problem I have is in units. I'm using Ansys...

i have a question. i just try to learn MATLAB however i couldn't define the functions and variables inside the one script. i open new script file and give the function comment in it for example like this... function [ y ] = betaf( x,Ee) lambda=0.1; y=100*gammaf(Ee)*lambda/(2*pi*x)...

I attempted to build a tesla coil with a 555 timer but seemed to have failed some where. Perhaps you could take a look and give me some hints on what to try in order to make it work. I attached some pictures as well. I made the secondary coil on a 1/2 (.875 OD) pvc pipe with a 10 to 1 ratio...

Troubleshooting a problem ...Urgent please ! hello everyone , I'm working on 30-Bus grid with Powerwolrd simulator ( version 15 ) and I'm facing some troubles with the results ...I got some different values from the one I was expecting , such as low voltages on some of the buses , different...

Homework Statement The problem along with its solution is attached as Problem 1-5.jpg. Homework Equations Trigonometry. The Attempt at a Solution Should the 60° angle in Fig. 3 be 30°? Is Fig. 3 supposed to be the exact same thing as Fig. 2 except that the force is moved to be entirely...

I just began a course on computer science and we're to use Code Blocks as the program to use, but I can't get the darn thing to work. The built in simple program called "hello world" is supposed to have a black window pop up that says "hello world", but the window pops up and disappears and I...

Homework Statement I am trying to write a quick program that will let me experiment with some different file I/O functions. I want to practice taking data from a file, loading it into a 2D array, then performing some analysis on the data obtained from the file. I have created a .txt file with...

Homework Statement A uniform solid cylindrical log begins rolling without slipping down a ramp that rises 28.0 above the horizontal. After it has rolled 4.20 m along the ramp, the magnitude of its linear acceleration is closest to Homework Equations The Attempt at a Solution...

I found this equation for predicting the bending natural frequency of a tube but am having trouble working it out. I was hoping that someone might be willing to steer me in the right direction. First the equation and the info provided on the website: w = (B*l)2 * SQRT (E*I/(rho*l4)) w -...

Hello everyone! Need help with selecting terms for translation. The situation is as follows: A new production process is being developed. First, this process is tested on lab-scale equipment to see if it goes ok. (It may be full-scale equipment in a workshop too.) If any bugs are...

Hi guys I'm trying to program a Roulette game on Python My programs asks for inputs and I gave names to these inputs. The point is, since I didn't assign these names before, the following error occurs: UnboundLocalError: local variable 'color' referenced before assignment I tried to get...

The command \vec{}, whenever I see it in posts, comes out as a small square box, instead of the arrow above the letter, as it should. All other latex commands seem to work fine. I think the problem might be to do with the settings on my browser (i'm using chrome). I was wondering if anyone...

I have done the hardware implementation using the planned schematic below. but somehow no sound seem to be able to play from the speaker except some noises. Anyone can help me check if something is wrong with DAC shematic...

I purchased a 6gb set [3x2] tri channel ram chips. One of the chips is apparently doa. It appears replacing it with an identical 2gb chip is not necessarily guaranteed to work. Any suggestions?

Hello all. I have some problem with realisation Kalman filtering in INS/GPS integration system. I use equation from "Strapdown Inertial Navigaation" chapter 12. and trying programming Kalman filtering (discret), but have some trouble, estimate error have very small value on graphic, but error...

When I try and model a curve using a sine regression with my graphic calculator, it returns an error message that says: Singular Matrix I decided then to do it by hand. Here are three points. Minimum: (0,554.8), Maximum: (45, 1220.5) and a random point (20, 830.7) I want something in...

I am trying to build the instrument according to this link http://www.inventgeek.com/2009-Projects/Laser-Instrument/page5.aspx I am having problems with lasers.I can not focus the laser dot on the photoresistor.So I thought about laser array(fabricated)but i could not find it.So I am now...

Is LATEX broken? I put an equation in this thread and it doen't appear to be generating for me... https://www.physicsforums.com/showthread.php?p=3361568#post3361568

Dear Sir, We have been manufacturing tetrabutylammonium fluoride (TBAF) 1M solution in THF (tetrahydrofuran). Our quality is very good and has been accepted by few MN pharma companies. We have also been able to produce TBAF, 3H20 (TBAF trihydrate) with +99% purity and other specs such as...

I just link my microscope (Olympus CX31) with CCD (Sony), the staff 's company installed "Ulead program" in computer linked with CCD to capture the picture from microcope. The problem is when the picture shown in the computer, it is already too enlarged that we can't see the wider view as we...

I know this is a physics forum, but someone may be able to help. I have a mini-hifi that I want to use the tape player connections from as an aux in. I've soldered a stereo cable into the connections on the hi-fi as shown in the electronic diagram. The left channel works fine, without any...

Hi, I am attempting to wire a PIC18F45J10 to my PICKit 2 Programmer and I'm running into difficulties. My PICKit2 is reporting a VPP and VDD Voltage level error. Troubleshooting it further tells me that I have a VDD short. I have attached my wiring diagram along with the general wiring...

i am trying to clean up a pc for a friend but i can't get rid of norton av. went to add/delete selected remove it started uninstallation and encountered an error. after like ten minutes it said that it could not uninstall. it is a 2006 version of norton. help.

I'm making a coil gun for a project, and ran into a few problems. I used a circuit from a disposable camera, which had a capacitor and charging circuit. I used two wires attached to the capacitor to connect the circuit to my solenoid. However, after charging the capacitor, nothing seems to...

I've designed and constructed a guitar related audio circuit and I'm having a weird problem. When I tested the circuit at a friend's place yesterday we didnt have an amplifier with us so we used the inputs on his dvd to amplify the signal and listened to it on the TV's speakers. Today I...

Homework Statement Input a list of n integer values into a 1-D array and do the following: • determine and output the number of positive values and the number of negative values • update the array values as follow • if the value is located at an even-numbered subscript, replace the value by...

LaTeX don't work with Spoiler. Why ?

a friend gave me an averatec 2300 series laptop that was busted. it charges the battery and when i press the power button the power light comes on and the CD drive can be opened and spins up with a disc in it but nothing else turns on no fan, no built in screen, no attached monitor,or other...

Homework Statement Why am I getting an error message "Cannot find symbol" Homework Equations The Attempt at a Solution

I need to type http://www.artnet.com/artists/lotdetailpage.aspx?lot_id=538B3EDF20890B14 into latex but it keeps telling me I need to insert a $ symbol (to make it an equation), but I need the text written like this Is there a way to get round this problem? Thanks.

Does anyone know how to use Sweave in R? I read a tutorial it said make a texfile with extention .Rnw instead of tex f.ex myfile.Rnw and use the command sweave('myfile.Rnw') in R. But by R has no such function even though the tutorial says it has. Tutorial...

So I have the piezo lighter hooked up to a rheostat with one mega ohm resistance, then a 30 kilo ohm resistor and then another resistor of 1 mega ohm. I have an oscilloscope- it's really old though. It's max voltage if you set the axis on the bottom of the screen is about 80 Volts. It's hard to...