
Dear all,
I'm a new user and I like to exchange information about the use of this tool.
From my point of view tool...

Aug1314 03:22 PM
Fuxue Jin

194 
94,229 
I've occasionally been asked by some of the students I've mentored or TA'd over the years, "What's in your toolbox? ...

Jul1314 10:34 PM
NATURE.M

63 
82,408 
I came across another good search engine today looking for a datasheet, so I thought I'd try starting this thread for...

Dec313 12:53 AM
doubtbook

27 
58,169 
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Mar2608 12:32 PM
berkeman

0 
31,057 
Im new here and Im currently working on a small IR encoder project. I have the encoder working great but now I need to...

Dec2112 08:49 PM
lindhaw

6 
799 
Hey I have a thing that confuses me.
I have a mosfet that has to drive a transformer in pulsed regime.
Now I have a...

Dec2112 04:26 PM
Crazymechanic

4 
715 
Hi guys, I figured I might try making a LED to phase on and off for around 1 second, to be perfectly honest I have NO...

Dec2112 10:41 AM
trustnoone

6 
1,184 
Hi, 1st time poster, long time student/hobbiest of math, physics, most sciences. Just getting serious about...

Dec2112 08:13 AM
LordVader88

2 
542 
Does PUSH operation moves or copies data from register to top of stack ;
I mean, what happens to the contents of the...

Dec2012 10:12 PM
reddvoid

5 
1,367 
In particular, I am looking at a datasheet of a PNP BJT:
http://www.fairchildsemi.com/ds/2N/2N3906.pdf
I noticed...

Dec2012 08:36 PM
NascentOxygen

1 
478 
I was wondering how to convert E=70.7sinwt..< (just an example)
to something like 50∠0 degrees?

Dec2012 08:20 PM
NascentOxygen

4 
642 
Hi PF,
I have a transistor circuit with me with IFT . Please see that if this circuit can be used for AM...

Dec2012 06:39 PM
Enthalpy

2 
546 
Hi, can anyone help me on how to find Thevenin equivalent resistances for a Wheatstone bridge configuration? Ive...

Dec2012 02:41 PM
Ratch

1 
1,544 
We have a PC with digitaltoanalog converter. With help of this converter we generate “pure” sine: y(t)=A*sin(2π*f*t+...

Dec2012 10:50 AM
jim hardy

11 
870 
I helped my colleagues simulate inductance of vr crank sensor in Maxwell but my simulation result is quite different...

Dec2012 10:09 AM
jim hardy

5 
791 
Hello so I'm struggling to understand why is multisim telling me different outcomes in the exact same circuit with...

Dec2012 09:59 AM
Crazymechanic

19 
1,437 
in fourier transforms of normal baseband sigal , spectral components are replicated on both +ve and ve sides of...

Dec2012 07:54 AM
the_emi_guy

2 
1,365 
Hi:
when using op amp as differential amplifier,
can it used for input signal isolated from power supply of that...

Dec2012 03:16 AM
samaaa

5 
545 
Hello,
I am designing an opamp to be used as a lowpass filter and am using a TLC271. I have attached an image of...

Dec1912 02:48 PM
carlgrace

23 
2,192 
With a budget of less than $100, does anyone have an idea on how to make a cheap piezoelectric generator using...

Dec1912 10:17 AM
DrZoidberg

5 
1,539 
Hello everyone, I am new to this forum and this is my first post. I have an old generator that I have been working on....

Dec1912 08:50 AM
addisonElliot

0 
420 
Hello and thanks for taking a look
I'm an undergrad student that is trying to design and make a ion thruster for my...

Dec1812 10:35 PM
gjtrash

2 
965 
Hi PF,
I am searching for a good entropy source for random number generation. I want to know if when an SRAM...

Dec1812 09:16 PM
dexterdev

5 
570 
I know this is a bit of a newbie question but I want to learn something about generators.
I want to build a simple...

Dec1812 06:15 PM
tomadom

7 
934 
http://oi47.tinypic.com/2iuvksn.jpg

Dec1812 04:08 PM
berkeman

6 
638 
I don't understand how parity error detection is any use since if there are an even number of mistakes, the errors...

Dec1812 11:18 AM
yungman

3 
464 
Hi PF,
I would like to implement different random number generators using AVR microcontroller (both PRNG and...

Dec1712 09:49 PM
nsaspook

12 
1,186 
Hello everyone !
I got a problem, I can't figure out why when I compute A+B and 2\times (\frac{A}{2}+\frac{B}{2}) the...

Dec1712 09:38 PM
uart

5 
492 
i am designing a heating element control system. i am looking for a relay(with 5V input voltage if possible or 12V)...

Dec1712 02:15 PM
jim hardy

2 
445 
How does the efficiency of a Thin Film solar cell compare to the efficiency of a single crystal solar cell with...

Dec1712 12:08 PM
KillaKem

0 
553 
I would like to find a useful function to predict the output based on the input. I'm trying to figure out how to get...

Dec1712 10:08 AM
I like Serena

2 
1,693 
...plate of a different capacitor, why wont the positive end of a battery (lets say AA) pass current to the negative...

Dec1612 11:44 PM
Nevertamed

62 
2,512 
is it true that analog signals are the logarithmic version of the natural signals... and hence the name ana log.?
...

Dec1612 01:29 PM
sophiecentaur

7 
987 
Hello, my question is that almost all text books say that a linear system will give the output to a weighted sum of...

Dec1612 10:08 AM
sahil_time

6 
530 
Why is it that the air gap flux density is flat topped at no load. What happens to it's shape when machine is loaded?

Dec1612 10:08 AM
jim hardy

1 
843 
1) y(t)=dx(t)/dt
Is this system memoryless?
2) y(t) = 0 if x(t)<0
...

Dec1612 08:41 AM
sahil_time

4 
595 
Hello everyone,
I was wondering how to calculate the added resistance experienced when a cable is coiled rather...

Dec1612 05:34 AM
sophiecentaur

12 
918 
I am using Oppenheim for Signals and Systems and would like to try out sketching the signals in Octave. Can anybody...

Dec1512 01:39 AM
nascentmind

0 
426 
Boeing CHAMP weapon
Anyone have insights into the technology behind this new electromagnetic
pulse weaponry?….
...

Dec1412 10:44 PM
justsomeguy

8 
1,119 
I know that the there is some small capacitance between the windings of an axial inductor lets say, but how does one...

Dec1412 08:03 PM
Enthalpy

2 
760 
Can one take 4  1 amp diodes check them with diode tester and if they match hook them in parallel and get a 3.6 amp...

Dec1412 02:15 PM
Windadct

10 
1,993 
I am using this battery for a boat bilge pump. It's all working as expected, but what I am trying to determine is if...

Dec1412 11:04 AM
dlgoff

6 
2,009 
Hi,
I would like to use a Hall Sensor (e.g. FW Bell BH 204) or a Hall Element IC, like the AD22151 device for...

Dec1412 06:19 AM
Zollie

1 
558 
i want some books about oscillators
RC oscillator by opamp
LC oscillator by opamp
design it this kind of OC ...

Dec1412 01:42 AM
eng.mustafaS

2 
380 