John Curl's Blowtorch preamplifier

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#5,783
Steve Eddy said:


So no one has ever had any noise issues with commercially produced gear due to he ubiquity of 3 pin IEC power connectors and power cords and the chassis leakage currents they cause?
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Right. So how does that counter my statement?


Steve Eddy said:

Yes. God forbid sound should play any role in audio.

Instead of getting off in our listening rooms with good music, we should be getting off in our bathrooms with a graph in one hand and our manhood in the other.
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Erm, what kind of music do you listen to??
 
#5,788
fizzard said:


He didn't get anything wrong. It's just a sign convention, nothing more. If you reverse all the sign conventions in circuit analysis you get the exact same answer.
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Sort of. When it comes to 'grounding' or 'shielding' it becomes a different matter. Einstein mentions that too. Celestial Mechanics does not -quite- work, unless you go to that thing he said about 'possibly having the sign wrong'..then it works..and the planets no longer fly out of their orbits. Whew! 🙂 A ground tends to have a reactive mass, so proximity becomes a critical point. So layout becomes an exercise in 3-d geometry and how it relates to the dynamically surging AC fields/mass around each device/trace/wire/board/chassis/etc. As well, the entire dynamic considerations of the signal are also expressed in the ground path (after all it IS a 'return' to a large degree, depending on the gear type), which should have similarity to the signal path, in scope and layout. Not less, and certainly not more.
 
#5,789
For the record, I have all the respect in the world for John. I have stated several times that I think the stuff he did in the 80's is probably all anyone would need. Sometimes we're a couple of old coots arguing over ideas that we have become married to and I admit I'm not that tolerant of imprecise thought. So let's get back to circuits.
 
#5,792
john curl said:
The '80's are the past, but most of you have not caught up to that point, yet.
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Actually, in the 80's I was a starry eyed clueless dreamer. Then reality set in.

While I may not have the focus and passion you have for the intricacies of the topography and device characteristics, I put the same amount of effort into understanding the environment that a circuit operates in.

Now that were in the new millennium, my experience allows me to build very sensitive sensor applications that function flawlessly in environments that make audio look like a child's playground. Building block electronics executed properly, I think.

Don't ask questions, attack! That’s how we all learn.
 
#5,795
MikeBettinger said:
All controllable through proper grounding layout. No noise needs to circulate through the signal path. :scratch2:
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Three prong power cords can introduce issues which go beyond internal grounding layout.

The hot lead, which by code is to be connected to the equipment chassis through the most direct means, capacitively couples to the safety ground creating chassis leakage currents.

If the voltage drops across the power cords of two interconnected pieces of equipment are not of the exact same magnitude and polarity (which would cause them to cancel), then an AC voltage potential between the two equipment chassis is created resulting in interchassis currents.

And because of the non-zero resistance of the ground leads of the interconnects, the voltage drop across it appears at the input of the downstream component.

Bandaide approach to solving the grounding issues. 🙂
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No, the current mode interfaces used by Krell haven't anything to do with grounding issues.

se
 
#5,798
Steve Eddy said:


Three prong power cords can introduce issues which go beyond internal grounding layout.

The hot lead, which by code is to be connected to the equipment chassis through the most direct means, capacitively couples to the safety ground creating chassis leakage currents.

1) If the voltage drops across the power cords of two interconnected pieces of equipment are not of the exact same magnitude and polarity (which would cause them to cancel), then an AC voltage potential between the two equipment chassis is created resulting in interchassis currents.

2) And because of the non-zero resistance of the ground leads of the interconnects, the voltage drop across it appears at the input of the downstream component.

3) No, the current mode interfaces used by Krell haven't anything to do with grounding issues.

se
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1) But these currents do not have to circulate in the circuit grounds. They only need to be terminated back to the power transformers/supply references of the two components. Control this loop and the negatives are minimized.

2) Only if you allow it to.

3) My comment was based on the way the reference was presented; as a fix for grounding issues. If I interpreted it wrong, my bad. The rest still stands.
 
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