jnjn
100+ Head-Fier
- Joined
- Dec 12, 2011
- Posts
- 121
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- 14
Quote:
I hope you don't mind my culling out context which is not important to my response.
If as you claim, you worked as an electronic design engineer, you should understand what I say..if not, let me know and I will further elaborate.
Take a source component and connect it with two coaxial IC's to a two channel amplifier.
When a signal in one channel is passed from the source to the amp, it does so by driving a voltage on the center core wire of that channel's coax.
What path does the signal take in order to get back to the source? If you answered "the shield of the IC which contains the signal", then you are incorrect, and have failed one of the simplest tenets of EMC. Control of current.
When a coax cable carries all the signal current via it's internal core wire, but returns to the source only 50% of that current, is the coax performing as a shield?
Again, the answer is no.
Now, toss an ABX box into the fray. Have you controlled the path of the return current?
No.
If you wish, I can teach the needed EMC concepts. If you do not wish for me to do this, I can provide links to some of the works of Tom Van Doren, or recommend a few good books. I do have a couple of jpegs from one of TVD's booklets when he was here.nice guy..
Cheers, jn
ps..edit. I've removed reference to what i do for a living, it should not made a difference, post content should be judged on merit alone.
I won't bother disagreeing with the rest of what this guy has written, but basically, he starts from a point of disagreeing with PA and just lets his mind flow on. Anybody who thinks that a switchbox invalidates ABX is grasping at straws. At the end he throws in 'EMC' in a vain attempt to garner some scientific credibility with the easily impressed.......snip.....
I've also worked as an electronic design engineer.
I know what I'm talking about.
w
I hope you don't mind my culling out context which is not important to my response.
If as you claim, you worked as an electronic design engineer, you should understand what I say..if not, let me know and I will further elaborate.
Take a source component and connect it with two coaxial IC's to a two channel amplifier.
When a signal in one channel is passed from the source to the amp, it does so by driving a voltage on the center core wire of that channel's coax.
What path does the signal take in order to get back to the source? If you answered "the shield of the IC which contains the signal", then you are incorrect, and have failed one of the simplest tenets of EMC. Control of current.
When a coax cable carries all the signal current via it's internal core wire, but returns to the source only 50% of that current, is the coax performing as a shield?
Again, the answer is no.
Now, toss an ABX box into the fray. Have you controlled the path of the return current?
No.
If you wish, I can teach the needed EMC concepts. If you do not wish for me to do this, I can provide links to some of the works of Tom Van Doren, or recommend a few good books. I do have a couple of jpegs from one of TVD's booklets when he was here.nice guy..
Cheers, jn
ps..edit. I've removed reference to what i do for a living, it should not made a difference, post content should be judged on merit alone.