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Overunity Machines Forum



Test Equipment: Oscillocopes

Started by MarkE, February 14, 2015, 04:35:20 PM

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MileHigh

#160
February 25, 2015, 08:44:22 PM
Brian:

I hate to tell you this but in my opinion you made a mistake using the PB Blaster.  That is noxious stuff for eating through rust to take nuts off of bolts and stuff like that.  That stuff even smells like it means business.  I know it from the brand "Screwloose."  The WD40 is safely assumed to be essentially benign.  Who knows, but potentially the PB Blaster could eat through the carbon or plastic resistive track inside a pot over several months.  It's simply nasty stuff if it looks and smells like I think it does.

MileHigh

Brian516

#161
February 25, 2015, 09:01:39 PM
Quote from: MileHigh on February 25, 2015, 08:44:22 PM
Brian:

I hate to tell you this but in my opinion you made a mistake using the PB Blaster.  That is noxious stuff for eating through rust to take nuts off of bolts and stuff like that.  That stuff even smells like it means business.  I know it from the brand "Screwloose."  The WD40 is safely assumed to be essentially benign.  Who knows, but potentially the PB Blaster could eat through the carbon or plastic resistive track inside a pot over several months.  It's simply nasty stuff if it looks and smells like I think it does.

MileHigh

I haven't used it on anything but the one slider that I did the experiment with.  That is exactly why I did it on something that doesn't matter, and brought it up in the forum before using anything like that on something that does matter, like the scope. :)

Brian516

#162
February 25, 2015, 09:18:27 PM
There must be an issue with using my computer to put a signal to the scope....
For some reason, the 465 displays the exact same trace no matter what signal I output from my PC. This is the case whether I connect the probe to Left, Right, or Ground. The sounds change in the headphones I wired in, and on proper channels and all that.
If I hook up the 'ground' to the ground out of the PC, it cancels out the signal.
What I see when I hook it to the PC out is a crappy looking sine wave trace at 150V.

I tried various different settings - AC and DC coupling show the same trace.
Trigger level does nothing.
Anything but "A" on Horizontal Display makes it extremely bright except for the first half of the sine wave.

I didn't bother switching to one of my Tek probes to see if the sine wave trace looked any better. seems pointless to do.

I also disabled all audio enhancements and DC offset cancellation, etc. It should be 'direct output'.
About to make a quick video to show what I am talking about, then I'm going to figure out how to use the GR Oscillator and see what that looks like on the scope.
https://www.youtube.com/watch?v=E9l-EnME9Vw

Brian

Pirate88179

#163
February 25, 2015, 09:23:01 PM
Quote from: Brian516 on February 25, 2015, 09:18:27 PM
There must be an issue with using my computer to put a signal to the scope....
For some reason, the 465 displays the exact same trace no matter what signal I output from my PC. This is the case whether I connect the probe to Left, Right, or Ground. The sounds change in the headphones I wired in, and on proper channels and all that.
If I hook up the 'ground' to the ground out of the PC, it cancels out the signal.
What I see when I hook it to the PC out is a crappy looking sine wave trace at 150V.

I tried various different settings - AC and DC coupling show the same trace.
Trigger level does nothing.
Anything but "A" on Horizontal Display makes it extremely bright except for the first half of the sine wave.

I didn't bother switching to one of my Tek probes to see if the sine wave trace looked any better. seems pointless to do.

I also disabled all audio enhancements and DC offset cancellation, etc. It should be 'direct output'.
About to make a quick video to show what I am talking about, then I'm going to figure out how to use the GR Oscillator and see what that looks like on the scope.

Brian

I would like this to be figured out as well.  I never thought of hooking up my scope to "see" the music I play on my computer all of the time.

I didn't know we could do that.

I also do not know how to do that.

If it is as easy as probing the 3.5mm output cord from my computer then, it will be easy.  Somehow, I don't think it is as simple as that.  I will keep watching here to find out how to do this.

Bill
See the Joule thief Circuit Diagrams, etc. topic here:
http://www.overunity.com/index.php?topic=6942.0;topicseen

Brian516

#164
February 25, 2015, 09:50:50 PM
Quote from: Pirate88179 on February 25, 2015, 09:23:01 PM
I would like this to be figured out as well.  I never thought of hooking up my scope to "see" the music I play on my computer all of the time.

I didn't know we could do that.

I also do not know how to do that.

If it is as easy as probing the 3.5mm output cord from my computer then, it will be easy.  Somehow, I don't think it is as simple as that.  I will keep watching here to find out how to do this.

Bill

It appears that the PC headphone jack is outputting an AC signal in order to power the headphones that overpowers any waveforms from the audio that I would be able to see on the scope.  Therefore it is necessary to run the PC output signal into some sort of "filter device" in order to kill the main power signal and only leave the audio waveform. 
Now that I think about it...  The output signal from the PC is an ACTIVE signal, in order to power the unpowered listening devices (headphones).  The signal that is needed in order to watch the waveforms on the scope is a PASSIVE signal.  So now, to look up how to transform an active signal to a passive signal..  Usually it's done the other way around via amplifier..

I'm no audio expert by any means, so I could be completely wrong about that. I could be doing something wrong, or it could be something entirely different.  We'll just have to wait and see what solution is brought forth by people who know more about this.

Brian


**There must be something that I'm missing as far as the whole "150V" thing....  My probe was on X10.... but I don't see how my PC could POSSIBLY be pushing 150VAC out the headphone jack... maybe 15V but more likely 1.5V.  My scope MUST have been being deceived, somehow.  The loopback to the PC scope only showed 1.2V, but that's internal loopback via software, so I don't see how that would apply whatsoever to what comes out of the audio jack. 
I've been searching "Active to Passive signal conversion" and coming up with junk for 3D video projection and nothing for audio, which tells me that I'm missing something very simple.  All in all, a bit confused.... Maybe an Arduino based FG is going to be a better way to go...**
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