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Registered Member #1498
Joined: Thu May 22 2008, 07:08AM
Location: Hong Kong
Posts: 72
Coronafix wrote ...
A sound card is only good up to 20kHz, so that will be the limit of the oscope too.
Actually I don't care as I just want a scope to check the output of some general circuits.Above 20kHz is not necessary for me now.(And I don't have enough money to buy one...) Any simple or complex ideas will be accepted!
Registered Member #1739
Joined: Fri Oct 03 2008, 10:05AM
Location: Moscow, Russia
Posts: 261
err, ehat's the point of SC scope schematic and even buying it off eBay, if it only needs the correct software? By the way don't forget that scope bandwidth at #Hz doesn't mean you can watch any signal with up to #Hz frequency, it only means it cuts off everything that lies in higher spectral ranges. Eg if you have a 20kHz scope, you will not be able to get a proper trace of a 20kHz square wave, it will be reduced to sines etc. Therefore even messing with switching devices operating at less then 100kHz you will get a real advantage of 1, 10 and even probably 100MHz scope as you will be able to see the rise/fall segments more and more clearly ;)
Registered Member #989
Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
The bandwidth depends of what audio card are you using, mine, can sample input and outputs at 192Khz, but I cant read a signal from more than 100khz (it mess all up)
Most sound cards work at 48Khz so you might see only to 28Khz, so if its ok for you, remeber that Sound Card Input cannot handle much voltage, so you can blow it easily
Registered Member #509
Joined: Sat Feb 10 2007, 07:02AM
Location:
Posts: 329
Good point, but I'm sure most audio inputs would have an input filter, which could vary anywhere from 20khz to possibly 96khz on a 192Ksps sound card, and with who knows what frequency that is really at. It would be pretty easy to figure out with a nice signal generator, but that sort of defeats the purpose of going cheap on the scope.
I'm not saying you shouldnt give it a try. however. If you can get 40+khz bandwith with a 96+ksps audio card, you should be able to play around with audio amplifiers pretty easily. Just gotta watch out for real high frequency oscilations. :)
If the low bandwith suits your needs, why not give it a shot, but like others were saying, dont expect a ton from a 44.1ksps PCM card, especially when it comes to something like square waves.
Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
lhl_henrylui wrote ...
Coronafix wrote ...
A sound card is only good up to 20kHz, so that will be the limit of the oscope too.
Actually I don't care as I just want a scope to check the output of some general circuits.Above 20kHz is not necessary for me now.(And I don't have enough money to buy one...) Any simple or complex ideas will be accepted!
Here's a simple idea, Get some manners! If you want some help with something it pays to be courteous and to provide some information on what is or isn't happening with your situation. If you don't care for over 20kHz then why are you still here? go and buy the thing. Bear in mind that the circuits generally discussed on this forum operate well above 20kHz.
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Sound card oscilloscope
