All About Circuits Forum  

Go Back   All About Circuits Forum > Search Forums

Notices

Showing results 1 to 19 of 19
Search took 0.00 seconds.
Search: Posts Made By: voduychau
Forum: General Electronics Chat 09-23-2007, 10:10 AM
Replies: 2
Views: 1,049
Posted By voduychau
need SMS alert products!

i need a anti-thief product.When i go out,it can send an SMS (GSM network) when the door is opened (it can be a thief!),or transfer videos with 3G.

anybody who can give me some link for that...
Forum: General Electronics Chat 02-09-2007, 02:11 PM
Replies: 5
Views: 1,269
Posted By voduychau
i want complete theory of wave,speaker box and...

i want complete theory of wave,speaker box and the speaker (driver) in PDF (ebooks)
Forum: General Electronics Chat 02-09-2007, 03:42 AM
Replies: 2
Views: 979
Posted By voduychau
it's have 2 micro board,1 echo board,1 music...

it's have 2 micro board,1 echo board,1 music board,1 master board and 1 power board

the schematic is very big and i haven't convert it to PC image,but i think the Power board is very simple and...
Forum: General Electronics Chat 02-07-2007, 02:39 PM
Replies: 2
Views: 979
Posted By voduychau
my amplifier has problem!

it's California amplifier!

i turn it on 10 minutes,the noise occur(example: ziii....ziiii....ziiii),mixed with audio signal!

then i turn off the amplifier,and turn on again,it run correctly and...
Forum: General Electronics Chat 02-07-2007, 02:32 PM
Replies: 5
Views: 1,269
Posted By voduychau
is there any pages have wave theory,speaker box...

is there any pages have wave theory,speaker box design theory,and more ... ?

i don't like some DIY audio site,because they get some formulas,but they don't tell me how to get it.
Forum: Electronics Resources 02-05-2007, 04:03 AM
Replies: 10
Views: 8,831
Posted By voduychau
that file in RAR format,but this forum not...

that file in RAR format,but this forum not acepted that format,so i renamed it to .Zip file. If problem occur,or your manager can't auto detect format,please rename it to .RAR file,it's real format...
Forum: The Projects Forum 02-03-2007, 01:01 PM
Replies: 4
Views: 3,824
Posted By voduychau
i think Pspice is not good for simulation.It's...

i think Pspice is not good for simulation.It's hard to learn

some part give a wrong result,and some,i can't understand how to simulate it!

i recommend you to try Multisim
Forum: Electronics Resources 02-03-2007, 12:57 PM
Replies: 10
Views: 8,831
Posted By voduychau
thanks, but it's not a lastest version now i...

thanks, but it's not a lastest version

now i have a standard of a manufacturer,so i'll build more

anybody who need more part,please give me datasheet,i'll design it for you

to blurry: are...
Forum: General Electronics Chat 02-01-2007, 01:19 PM
Replies: 4
Views: 1,299
Posted By voduychau
oh,now i can understand it. thanks for your...

oh,now i can understand it.

thanks for your reply!
Forum: General Electronics Chat 02-01-2007, 04:27 AM
Replies: 4
Views: 1,299
Posted By voduychau
ok,i tested before and it run! so i just...

ok,i tested before and it run!

so i just want to ask you why i have problem with NPN transistor,because the transistor is off when logic 0,and the timer must be stop! But....it continue to run :(...
Forum: General Electronics Chat 01-31-2007, 11:35 AM
Replies: 4
Views: 1,299
Posted By voduychau
Exclamation problem with 555 timer!

in basic 555 timer circuits,there are two resistor and 2 capacitor ( one in pin 5), 4 and 8 connect to Vcc,and then they run,simple!

now i want to control it!

i disconnect pin 4 (floating),the...
Forum: Electronics Resources 01-31-2007, 03:49 AM
Replies: 10
Views: 8,831
Posted By voduychau
i'm building a new version of this...

i'm building a new version of this library,recommend use for "DIY" PCB,not for manufacturing,because of some reason....

so please help me:
-what is best parameter of Pad shape?
-with...
Forum: General Electronics Chat 01-31-2007, 03:26 AM
Replies: 10
Views: 1,871
Posted By voduychau
thank you very much,Dave! all best to you.

thank you very much,Dave!

all best to you.
Forum: General Electronics Chat 01-30-2007, 01:02 PM
Replies: 10
Views: 1,871
Posted By voduychau
somebody tell me FET/MosFET is good,and now i...

somebody tell me FET/MosFET is good,and now i think they have something wrong in their benefit.

with me,i like BJT,because it's easy for me.

thanks for everybody!
Forum: General Electronics Chat 01-29-2007, 11:34 AM
Replies: 6
Views: 2,195
Posted By voduychau
therefore,JFet(channel N & P) and MosFet(channel...

therefore,JFet(channel N & P) and MosFet(channel N & P) don't work properly in backward,too ?
Forum: Electronics Resources 01-29-2007, 04:01 AM
Replies: 10
Views: 8,831
Posted By voduychau
Orcad layout library

this is my layout library,i hope it useful for you

i don't have any information about Pad shape,layer.... so if it have any problem,please ask me

anybody have ebooks,information... about...
Forum: General Electronics Chat 01-29-2007, 03:49 AM
Replies: 6
Views: 2,195
Posted By voduychau
can we invert the Drain-Source of Mosfet? i...

can we invert the Drain-Source of Mosfet?

i think there're no difference,isn't it ?
Forum: General Electronics Chat 01-29-2007, 03:40 AM
Replies: 10
Views: 1,871
Posted By voduychau
thanks for your reply! but you don't...

thanks for your reply!

but you don't understand me.Follow this link:
http://sound.westhost.com/project101.htm

Q1 to Q7,all of them is Bipolar Transistor,only Q8 and Q9 is power Mosfet,and i...
Forum: General Electronics Chat 01-28-2007, 01:39 PM
Replies: 10
Views: 1,871
Posted By voduychau
why FET is not popularity on power amplifier?

i see many power amplifer circuits,there're some good,there're some bad...

but just a little circuits used FET as a basic component

why?

(sorry for bad English,i'm Vietnammese :) )
Showing results 1 to 19 of 19

 
Forum Jump

All times are GMT. The time now is 10:08 AM.


User-posted content, unless source quoted, is licensed under a Creative Commons Public Domain License.
Powered by vBulletin
Copyright ©2000 - 2014, vBulletin Solutions, Inc.