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PC Sound Card Oscilloscope, Generator, Spectrum Analyzer (FREE)

alec_t

Well-Known Member
Most Helpful Member
Years ago I measured the frequency response of a PC sound-card. It fell like a cliff below 20Hz and above 20kHz. Do all modern sound-cards have greater bandwidth?
 

Nigel Goodwin

Super Moderator
Most Helpful Member
Years ago I measured the frequency response of a PC sound-card. It fell like a cliff below 20Hz and above 20kHz. Do all modern sound-cards have greater bandwidth?

The clue is in the name 'sound' card :D

Filtered to cover the audio band, but I do remember mods for some sound cards to make it DC coupled for scope use.
 

tvrgeek

New Member
I have been using Zelscope for years. I'll check this one out. I use a Focusrite Scarlett IO box, so I still not DC coupled, better BW than the typical sound card. ( cap coupled so of course no DC)

Bought a Hantek USB scope, but 8 bits+/- 2 and only 20mV/div was not of much use for audio and power supply work. Bummer as a 12 bit with .5mV/div is well over what I am willing to pay.
 

tvrgeek

New Member
It was the +/- that was enough to give up.
I thought about a preamp. Build in nice over voltage protection. But I can buy another old Tektronix a lot cheaper. (Mine mystically both inputs went south. ) I don't have than many projects left, so I decided to move on.
If doing general digital work, it would have been a really slick tool. I remember "wayback" when the first digital storage came out. $50K and this one was $60!
 

Nigel Goodwin

Super Moderator
Most Helpful Member
It was the +/- that was enough to give up.
I thought about a preamp. Build in nice over voltage protection. But I can buy another old Tektronix a lot cheaper. (Mine mystically both inputs went south. ) I don't have than many projects left, so I decided to move on.
If doing general digital work, it would have been a really slick tool. I remember "wayback" when the first digital storage came out. $50K and this one was $60!

A suitable preamp would cost very little, google finds lots of examples:


 

tvrgeek

New Member
Sure. If I wanted another project lots can be done. I don't. I have too many projects and only a few left require electronics. So, I will get by with what Zelscope, TrueRTA , Atra, Holm, RightMark, and REW can do. For $150 one can get a very good used Tektronix. Not worth it at this point.
 

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