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Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Mar26-08 12:32 PM
berkeman
0 25,936
I came across another good search engine today looking for a datasheet, so I thought I'd try starting this thread for...
Dec3-13 12:53 AM
doubtbook
27 46,991
I've occasionally been asked by some of the students I've mentored or TA'd over the years, "What's in your toolbox? ...
Feb4-14 04:57 PM
davenn
62 59,308
As we know due to skin depth effect the Alternating Current flows at a depth from the conductor surface (which means...
Apr6-14 07:00 PM
meBigGuy
48 1,127
ansoft, maxwell Sticky Thread Pinned: Maxwell 3D (ANSOFT) ( 1 2 3 ... Last)
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...
Apr10-14 04:04 AM
mwvivi
189 60,596
Hi, please, help me understand this circuit that is drawn here: http://wild-bohemian.com/electronics/flasher.html ...
Mar12-10 03:40 PM
phyzguy
1 647
Hey guys. I bought this relay http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=255-1899-ND It...
Mar13-10 12:09 AM
jbord39
10 2,923
hello, i would like to know something for this circuit ...
Mar13-10 12:33 AM
manual
6 1,154
I was searching about the possibility of building a simple mobile phone, but I found an old topic here indicating that...
Mar13-10 05:43 AM
shaimaa
9 1,383
I was browsing a hobby supplies site, and I came across retract servos. What are they? I know what a servo is, but I...
Mar13-10 10:29 AM
thieu
4 2,764
Hi, I'm looking for a 6 pos, 2Amps, mechanical rotary switch that with every turn will short another contact to...
Mar13-10 10:36 AM
Carl Pugh
1 1,052
Hello guys, I have an upcoming test. When I was doing a question about finding the area of the wafer. it is circular....
Mar13-10 08:49 PM
onqun
3 2,072
If i connect 76 solar panels (3v each) (that are found in calculators) together can i generate voltage of about 230v...
Mar13-10 09:29 PM
mgb_phys
1 1,243
I would like to ask you what it is meant by "symmetric input" in the instrumentational amplifier schematics and in the...
Mar14-10 05:00 PM
Bob S
1 916
Hi, this isnt a homework question, but this is one of the best technical forums Ive seen for stuff like this so I...
Mar14-10 05:10 PM
Bob S
6 3,762
I need to replace a switch that has printed on it 3A 250VAC or 6A 125VAC. Is it alright to replace it with a switch...
Mar15-10 03:47 AM
Mike_In_Plano
12 1,047
Hi Experts,o:) I am trying to reverse the direction of a spinning dc motor (around 30watts) but not sure how this...
Mar15-10 07:58 AM
ramonegumpert
17 6,725
I am just learning about this and don't know if I am doing it right. I need to turn my car on with a push button...
Mar15-10 12:00 PM
johnnyb2000
7 2,397
I have heard that 'we don't get shock from dc current because it is constant but we get shock from ac current because...
Mar15-10 12:52 PM
Studiot
5 1,962
I'm just wondering, if an op-amp is connected in a positive feedback configuration, should the output not saturate...
Mar15-10 03:50 PM
Bob S
15 7,049
If you leaped onto an electric fence would I be right in assuming you wouldn't get electrocuted as long as you don't...
Mar15-10 06:04 PM
cjameshuff
6 3,719
hi..i want to know if anyone of you can confirm of BS 142:1966 for relay coordination time is 0.4s? thx
Mar15-10 07:40 PM
fannypf
4 2,172
Hey all. I am using a 555 timer chip to power an IR LED, which switches something on or off. My question is, now...
Mar15-10 10:08 PM
jbord39
8 2,906
any body helps me that how can i generate electricity 12volts DC or give me idea to run car generater for 12 Volts Dc...
Mar16-10 05:02 AM
MATLABdude
25 6,558
I have several 9vdc powered items that are used for scaring deer out of my yard. The device is motion activated and...
Mar16-10 09:30 AM
turbo
6 1,305
Hello, I am a student of electrical engineering of Madrid (Spain).. And I need to present a simple but original...
Mar16-10 09:52 AM
pedro_maria
0 926
Guys, I have a Lister generator that is capable of producing approx 5KW of power from an attached ST alternator. ...
Mar16-10 07:41 PM
craigcurtin
0 1,703
hi! everyone, um new to this forum and would like some help and few tips on designing a coding and decoding circuit to...
Mar17-10 06:57 AM
asterixdpt
3 757
Hello, I have many time thought about AC & DC Motors, but have not yet find out. Example. if a motor of 4HP 48VDC....
Mar17-10 10:20 AM
vk6kro
1 3,339
I will state here what I understand in this topic which I am a little confused: If I have 2 sinusoidal signals...
Mar17-10 05:12 PM
Ionito
0 1,147
What would be the best configuration for amplifying output from 555 timer chip? No matter what transistor...
Mar17-10 08:22 PM
jbord39
9 1,522
I need a tool to simulate 'Kalman Filter'. I know Matlab maybe do it, but it's not so convenient. Would you introduce...
Mar17-10 08:47 PM
jackerenren
1 1,002
Hello, I am trying to design a foundation for an audio preamp that is powered by a single 9V battery. I am...
Mar17-10 09:56 PM
neg_ion13
7 2,852
Hey guys, I am using the following circuit to switch on/off another circuit. ...
Mar18-10 12:16 AM
Carl Pugh
1 628
Hello Experts, I bought a top that has LEDs blinking when you spin it. It does not light up when not spun. This...
Mar18-10 12:44 AM
ramonegumpert
3 694
References are available to calculate skin effect, RAC/RDC given wire gauge and frequency. But my problem is a...
Mar18-10 04:06 AM
Phrak
8 3,646
Hello all, I was wondering what the difference between a power amplifier and a preamplifier was. Someone told me...
Mar18-10 09:22 AM
neg_ion13
1 6,293
In the book 'Virgintell' which has a lot of seemingly high ideas about science there is the proposition that light can...
Mar18-10 09:26 AM
neg_ion13
2 1,404
I have made an onboard uncoupling device for my model railway,It works perfectly using the circuit from a toy...
Mar18-10 02:24 PM
berkeman
1 999
I know as a fact that excitation (amount of current on the generator rotor) determines the amount of reactive power...
Mar18-10 07:34 PM
sophiecentaur
18 3,306
So I'm getting my water heater changed and my circuit breaker is probably wired wrong because we had to flip a bunch...
Mar19-10 09:51 AM
dlgoff
7 1,003
This is probably a dumb question, but I only need to know for a program I would like to write. Basically, on...
Mar19-10 12:28 PM
Bob S
4 862
I need some help identifying what I'm pretty sure is a resistor. I have a power supply that blew up, I opened it up...
Mar19-10 03:28 PM
n00bsauce
8 1,909
Hello all: This is my first post on the physics forum so I am excited to have found such a great community of...
Mar19-10 08:36 PM
cjameshuff
4 2,261
http://i41.tinypic.com/beg3o5.jpg if we have a molecule or atom then if we take avogadros number amount of this...
Mar20-10 07:29 AM
nhrock3
5 899

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