EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: nukearts on November 20, 2016, 10:01:43 pm
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Hello,
I am electronic music enthusiast and i am somehow getting more and more involved with vintage gear.
Today i got this piece of Kit:
A Heathkit FS-Breitband-Oszillograf de luxe IO-12E
https://goo.gl/photos/ZKAMrLbQGRNqFTKo9
And it works :) Yeah
But i am not sure what the best option is to get the right cabling done for my intentions. I want to monitor my Audiooutput with this setup.
So the vertical will be always a 1/4" TRS jack with the audiosignal. I have an RME Fireface 800 that is able to send out wordclock over BNC. I have thought of it is possible to use this wordclock signal for the horizontal input. But i am thinking how i make the cables right, that these banana plugs get the most directly connected without any great loss of shielding. (you see the photos. :-DD xD)
greetings,
Nuke
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Hey mr Atomic Bomb :)
As far as I understood what you want to do I would suggest that the best way to achieve your goal would be a small opamp buffer driving the input of your scope. Even though the scope has a high input impedance which would indicate that it is no problem to connect it permanently parallel to your setup, I would expect some noise entering the audio line at the connection to the scope. That would also sort out the problem with the connections, just build it with two TRS jacks for input and output and two banana sockets for the connection to the scope. You coule even build it as a "plugin" for the scope, meaning to let some 4mm contacts protrude from the circuit in exactly the distance of the input ports of the scope. So you could plug the buffer circuit directly into the scope and wouldn`t have another pair of cables running around your setup.
Edit: regarding your idea of using the worclock: as far as I understood what the wordclock is you can`t use that. It seems to be just a clock signal to syncronize every piece of equipment, there shouldn`t be any way of getting your actual audio signal from that.
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Thank you very much for the answer Ysjoelfir.
I realize now how much of a bad Idea the horizontal sync with the samplerate is. And I need to think of more about what I wanna see on the oscilloscope to bring it maybe to topic here.
The Vernier frequency of this scope should go down to 30Hz. So i have a very short timewindow for seeing more of a waveform then just a cycle. Seems that i need a modern scope for getting more than one cycle of audiowaveform (if i assume things right now).
greetings,
Nuke