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Jan16-12 Greg Bernhardt
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Mar26-08 12:32 PM
berkeman
0 30,102
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 56,073
Even as a kid, I saw beauty in old devices. That made me want to understand how they worked. I had lots of old...
Jul21-14 12:14 AM
dlgoff
21 5,581
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...
Jul5-14 05:32 AM
hussain_aamir
193 88,169
I've occasionally been asked by some of the students I've mentored or TA'd over the years, "What's in your toolbox? ...
Jul13-14 10:34 PM
NATURE.M
63 78,267
Hello, I haven't learned anything about micro controllers yet but I wanted to get a head start since I hear that...
Jul21-14 08:30 AM
Windadct
21 6,731
I purchased two of these for 14$: http://i46.tinypic.com/2n6x4ox.jpg http://i46.tinypic.com/7lfd.jpg What can I...
Sep11-12 09:40 AM
jedishrfu
3 624
Hello, I would like to know if there is a part I can buy that will alternate my dc power circuit on/off at short...
Jun7-11 02:16 AM
Biasless
6 1,240
Please explain the below: Resistance@95 =R@35 x (1+α*(95x(I/Io)+20))/(1+75x α) at the actual current A (I Act).
Jul20-14 04:11 AM
bibincjoy
10 806
Hello Guys !! My question is : why in these photos the ohmmeter reads the total resistance ?? ...
Oct17-13 09:35 AM
sophiecentaur
3 445
hello guys ... i want to design this circuit on proteus and print it to put it on a board this is a regulated...
Nov27-13 07:04 PM
Baluncore
1 483
Hello guys !! :) i need your help in the integration which is used to calculate the total charge in the electric...
Mar22-14 04:23 PM
jim hardy
3 265
How can i test an ammeter with ratings 24V (dc) 100 A with any load? This is just to check whether the ammeter works...
Nov30-10 02:58 PM
waht
1 1,935
I need to know how can I increase the duty cycle of a pwm. Thank you very much :)
Apr28-09 03:00 AM
vk6kro
2 2,187
anyone point me in the right way to wire this variac up correctly....i'm wanting to control the speed of a fan running...
Mar18-11 10:57 PM
TurtleMeister
6 2,991
I always wanted to know how this worked? I know AMPs is how many Electrons move past one point in a SEC. I know...
Feb7-13 08:39 PM
benjaminbailes
13 1,478
I need some help understanding how a House Fan is wired to 2. Switches and 1. Switch can turn the fan on and off and...
Jul17-12 07:28 PM
biferi
16 1,863
I am trying to build a 3 phase sine wave 2.5-3 mhz power supply. To do that with electronic's is beyound me. I have a...
Jan30-07 01:20 AM
biff
12 2,970
Hello every one:smile: I would like some help regarding building a battery powered heater. Let me describe the...
Jan15-12 06:42 PM
dlgoff
12 3,525
This may be kind of odd, but this is my first post, so I'm kinda new at this. I need to calculate the output...
Nov7-06 03:51 PM
berkeman
6 9,527
Ok guys, I'm a ME in a bit of a bind. I need to find a crash course in monopole antenna design really quickly. Anyone...
Feb9-08 12:24 PM
bigaggie
0 2,492
I am a 2nd year student at an engineering school. I searched google and other sources to try to find anything and...
Aug6-11 04:40 AM
dpksign
7 40,544
I got a piece of machine imported from China and after inspecting the motor it was 50HZ after looking at the specs on...
Oct3-08 02:49 AM
Pumblechook
15 3,090
Is it possible to turn my 20 square foot welding table into an elctromagnet? I weld steel cut nails into artwork. The...
Jan24-11 05:00 PM
pantaz
7 2,133
We have had a catastrophic failure of an SF6 circuit breaker. This breaker was used as a synchronising breaker for a...
Dec16-09 07:37 PM
timmol
8 6,711
We operate a 3 phase, 11kV network with automatic power factor correction equipment installed. Over the last four...
Jan21-09 06:26 PM
dlgoff
5 1,842
well im not sure if this is the right thread cuz im new, but i wanted to know. what are the most efficient ways of...
Jul11-12 10:20 AM
sophiecentaur
31 10,050
Hello guys, If form example I am given the sequence impedance of a cable ( positive, negative, zero) Will I use all...
Jun30-07 07:45 PM
bigjoe5263
3 6,411
hi guys, just want to ask, an open loop has three points A,B, C and each point serving a load. there is only one...
Feb17-10 07:22 AM
dlgoff
11 2,487
hi!. anyone here who have an idea on how to assess the reliability of a ring bus system over an open loop/ radial...
Mar4-10 06:40 PM
bigjoe5263
2 4,798
The two power transformer 69/22.9kV and 230/69kV are both rated 60/80/100MVA designed for 60 Hz operation. However it...
Apr9-11 09:05 PM
able357
13 7,353
What I need is that when a certain key (on a keypad) is pressed it would output a corresponding binary number. I have...
Mar5-08 02:40 AM
zeitghost
4 1,395
I would appreciate it if anyone could add good quality reference books that would benefit me. I graduated in May and I...
Dec19-08 03:06 PM
berkeman
1 1,260
Hello everyone, can anyone please suggest a good book on the theory of transistors. I want to study...
Jun3-13 10:21 PM
Bobbywhy
4 561
Hi All, I know that when water pass through a 90 degree bend pipe, there will be a pressure lose. However, how to...
Apr28-10 11:13 AM
bigreat
13 3,089
The is the Output circuit of a microphone I'm using to look at photoacoustic signal, is just an Op-Amp, connected to a...
Nov14-12 12:45 PM
Bigredbloke
0 479
i got this opamp, LF444. i was playing around with it and notice some thing not right. if the opamp just had a wire...
Jun15-08 02:44 PM
deakie
2 995
I am building a circuit to detect single photon. i a circuit with opamps. it work however the output pulses have a...
Dec20-09 04:28 PM
bigrock
0 686
Hi I'm having problems identifying a component on a PCB and i was wondering if anyone here could shed some light on...
Feb23-12 12:10 PM
berkeman
7 1,060
Hi folks. I am ME/AE by profession but I love robotics and I tinker. I have pretty much zero EE experience so this...
Jan15-11 03:40 AM
yungman
5 2,204
Hi, I have a 480 V, 200 kVAr and 60 Hz capacitor bank. I need to move this bank to a location with 390 V and 50...
May20-10 08:30 AM
biguelo
2 1,704
Hi, I have read that one of the benefits to increase the power factor through capacitor banks is the reduction of...
May24-10 07:15 PM
mheslep
8 7,898
Hello, I am a new user here but have found links to this site in many of my Google quests so I thought this may be the...
Dec29-11 11:26 AM
jim hardy
3 998
if i want to connect a comparator chip's output (TTL) to Spartan2 FPGA board, can i directly do it, do i need to...
Mar17-05 01:16 PM
egsmith
3 2,255
Hello, Please could you help me with this problem; I need to design a timer whereby I briefly trigger it (using...
Mar6-09 03:25 AM
big_tobacco
4 1,446
:confused: Hello Could you tell me is there a way of accurately measuring battery life? Basically I have a...
Jun19-09 03:28 AM
big_tobacco
6 10,009

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