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stahlhart
Platinum Member
1318 Posts |
 Posted - 02/07/2006 : 23:01:24
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quote:
Originally posted by Dingus
in all this Oscilloscope Talk that constantly goes on, mostly in regards to trimpots, I found this:
http://polly.phys.msu.ru/~zeld/oscill.html
If someone figures it out, I haven't tried yet, but figures a way to hook it up, possibly a mic? so it can be used to calibrate boss pedals, that'd be freaking swell.
Thanks
I'm going to give it a shot. I could actually use a scope at the moment, and don't have one -- I've got an Electric Mistress that needs some work in the LFO circuit, and being able to see the clock signals would really halp with the troubleshooting.
Seems to me that you'd have to calibrate the sound card inputs against a known voltage for accuracy, as well as knowing what would be the largest amplitude signal you could feed the card without causing any damage. Probably not a significant issue for the signal levels I'd be working with, though.
But I'll try this out -- hopefully the Windows 95 one will run under 2000's 95/98 adaptation layer okay. But I do have an older PC with Windows 98 on it just in case (an old P1 unit I use strictly for audio recording, as it has a Turtle Beach Fiji that does bit-perfect digitial audio transfers to and from DAT).
C.K.
edit: I've got the scope software working with W2K; I can generate audio traces on the screen with my microphone, and can vary the amplitude of the input signal using the sound card's mixer software. Next will be to substitute test leads for the microphone and feed a signal in...
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Edited by - stahlhart on 02/08/2006 00:29:37 |
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Dingus
Silver Member
USA
472 Posts |
Posted - 02/08/2006 : 03:48:30
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| excellent, let me know if it works, the cheapest actual Oscilloscopes I've seen are like $150 |
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stahlhart
Platinum Member
1318 Posts |
Posted - 02/08/2006 : 05:23:16
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Well, thus far I see it as a stopgap at best -- the response of the display is a little slideshow-ish compared to a CRT. That may or may not matter, depending on the waveform being examined.
I was actually going to start seriously shopping for a decent scope this spring or summer. I'm thinking that something like a Tektronix 453 would be good for general bench work.
But this Windows scope might just do the trick in the meantime...
C.K.
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phostenix
Gold Member
USA
754 Posts |
Posted - 02/08/2006 : 06:14:56
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| There's another piece of software whose name escapes me right now that is a spectrum analyzer/oscilloscope for about $100. A friend of mine has it & it works great. I'll get the info from him & post back. |
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stahlhart
Platinum Member
1318 Posts |
Posted - 02/08/2006 : 21:25:33
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I actually thought that this would be a worthwhile thing -- you've already got the CRT in place with a PC; you could just make a PCI card that had X and Y inputs, the necessary triggering and what not, and with a software interface you could run a PC as a bench scope. We already have WinRadio cards that turn a PC into a shortwave receiver, so it doesn't seem to me that an fully functional (if not laboratory-grade) oscilloscope is out of the question. Mabye it's too esoteric for the market.
I had an old Heathkit clunker many years ago, one of the 500KHz ones (kinda sorta like the venerable Eico 460), but it just didn't have enough bandwidth for some of the radio work I wanted to do, so I got rid of it a while back, so at the moment I'm scope-less. Now that I'm getting back into music electronics after a lengthy absence, having one to dig into the clocking of these pedals or for working on amplifiers is interesting me again.
C.K.
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741 Replacement?
