Good idea! You can show these people up!
https://www.izotope.com/en/products/create-and-design/vinyl.html
https://www.audiothing.net/effects/vinyl-strip/
Jan
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Sorry sailor don't quite catch the cut of your jib?
Qwerty?
What sort of wire configuration should best be used?
Are we using these single ended or balanced only?
Ok so three simple questions:
Subjectively in your system:
- does the technically "best wire configuration/type" (as measured & according to theory) also sound best?
- does the technically "not as good wire configuration/type(s)" sound the same or not as good?
- does it matter to YOU if the wire you choose to use is randomly acquired wire, or do you want a specific wire, specific material and composition?
What have you found?
_-_-
QUERTY: epitome of largely arbitrary standardization. Ergo, when you DIY you can go bespoke and choose whatever works best for your system.
I.e. one of the biggest advantages of DIY is that you can design from the source through the speakers and make decisions that have the overall goal in sight. Rather than mix and match and try for some sort of serendipity.
I.e. one of the biggest advantages of DIY is that you can design from the source through the speakers and make decisions that have the overall goal in sight. Rather than mix and match and try for some sort of serendipity.
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A fun project in minimalism, one stage differential folded cascode all FET open-loop, using a very simple common mode feedback. Impedances are high so all caps are NOS TRW PS. I know heresy, no 8-legs. I already tried just a mic pre-amp and the mini DSP RIAA that worked fine for me.
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This is the diagram I am referring to.... comment pls.
View attachment flux field within wire.pdf
THx-RNMarsh
THx-RNMarsh
That is a 2-d sectional view of the magnetic flux lines generated by a solenoidal coil. I suspect you've mixed pages.
https://www.google.com/search?q=sol...OAhUKPz4KHZ-SBW8QsAQIGw#imgrc=x7KNZUsBmtaaAM:
Edit: that is also what the sectional view of the magnetic field of a stripline looks like. Here is a link showing a strip 6 mils over a wide ground plane. If you fold the depiction at the upper surface of the groundplane (at zero) mirroring the fields, you will show the mag field lines with two equal width strips but spaced at 12 mils apart. Note that the currents in each strip are opposing, one into the page and one out of. If you ask marce, I'm sure he can provide more details, as striplines are his bailiwick..
https://www.google.com/search?q=str...OAhWM2R4KHebTCSsQsAQIPQ#imgrc=57FqrXuGg1p0wM:
If you go down a bit on that search, you will also see a differential pair depiction on www.sigcon.com with colors, it shows directly the magfield lines due to a pair of strips.
John
edit: oh, that is funny. I copied the link, and the entire search shows up. I forgot to go to the page first, then copy the link...
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Planning to post/publish one you have it running? The minimalism doesn't suprise me given how much of your working life has been taken up with 8-legs.
clearly not talking high end here
a college roommate I recently talked with at a alum event mentioned his daughter's problems with her hair salon business - multiple investigations/threats over the large weekly cash deposits at the drug money laundering regulation thresholds
http://www.bizjournals.com/bizjourn...s-millions-from-law-abiding-businesses-3.html
a college roommate I recently talked with at a alum event mentioned his daughter's problems with her hair salon business - multiple investigations/threats over the large weekly cash deposits at the drug money laundering regulation thresholds
http://www.bizjournals.com/bizjourn...s-millions-from-law-abiding-businesses-3.html
It's funny how easy it is to detect that some restaurants are laundering money.
I used to go to a very good Italian place near Cal State Northridge when I worked at Harman. One day I pulled into the parking lot just as two expensively-dressed gentlemen were getting into a high-end Mercedes that was rather dusty. The scowls on their faces, muscular builds and general demeanor suggested mobsters, or maybe just prepping for a casting call for The Sopranos. I was fascinated but realized I'd better not stare
I have never heard difference between two different brand of metal film resistors. Or two power supply capacitor. So I not influenced with placebo.
With WBT bass is immediately drier, firmer ,acoustic guitar more focused,more neutral and less thick etc.
In the past , many people used to directly solder cables eliminating connectors, always with clear improvement. Where we must use connectors, WBT emulate directly soldered connectors.British made preamp DN audio had soldering tags instead RCA connectors on MC cartridge input.
Mr John Curl is a designer who reports differences in sound between various soldering alloys, wires, resistors and even PCB material. I suggest him that as a part of development of his high end preamps replace in critical position Vampire brand RCA connectors with WBT Nextgens.They are expensive, but many members here have 1000+ tonearms and DAC-s.
and could a single wire be like a single turn coil or similar? The flux lines still looking similar (though weaker) thru the length of the wire and out. resulting in similar higher density in center compared to surface.. as I depicted?
For skin-effect to get established, the center of the wire must (in engineering terms) become a higher Z.... or the HF would go thru the center also and not just on the surface. Does increased flux density in the center make it higher Z?
Comment pls.
THx-RNMarsh
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kamis, are you near any broadcasting stations? When I lived nearly underneath a high-powered television broadcasting tower (holding other antennae as well), I found that different connectors and cables strongly influenced the amount of very annoying buzzing that came through the speakers when I used a MC phono cartridge. This was well above placebo-likely levels -- with some cables it was at "turn that damn thing down!" levels. The phono preamp I used was built into an old PAS-3X chassis with tin-plate phono connectors. The mating connectors that gave me the lowest buzzing were actually cheap tin-plate types also (because same metals?) from Radio Shack in the 1960s! The very worst were some gold-plated, quite short, "Gold-ens", some of the first "high-end" IC cables on the market. Soldered connections were pretty good when I tried them, but not very convenient. Of course cable lengths and placement also had strong effects (they were acting as antennas I assume).
The flux down the center of a wire is zero density. It is a consequence of attempting to take the integral of zero area with no current within.
AS I previously linked to initially, the flux is a linear increasing function from the center of the wire to the surface for DC.
No. The eddy currents cancel out the center current and increase the edge currents, this is depicted on the wiki page also previously discussed.
No. The cancellation of transport current by the eddy currents decreases the current in the center of the wire.
There are two sources of current density profile modulation within a conductor. When it is caused by it's own rate of change of current, we call it skin effect. When it is caused by a rate of change of magnetic field from another source, it is called proximity effect. This can be the return conductor, or it can be magnetic elements such as an iron core as part of the magnetic system.
Proximity effect is what you are actually referring to. This effect causes current centroid modulation towards the path of least impedance. ( This is a huge issue for me with high bandwidth magnets, as the proximity effect can cause a 100 milliohm coil to rise in resistance to tens of ohms at the hundred to thousand hz range.)
You are mixing the two effects together incongruently.
John
yes. i am trying to find a simplified engineering model rather than physics model.
So, let me try this for an equivalent engineering model... With flux density highest away from center (with current flowing, of course), and making the Z higher at the outside (skin). So, that increase in Z at HF would effectively leave less conductor area (effectively smaller wire gauge) thus higher Z at HF.
Can you live with that? Rather than the pure physic answer? In electronic apps we dont need exact physic to build something useful using simplified explanations and models. That is what I am looking for which isnt completely accurate nor inaccurate.
THx-RNMarsh
So, let me try this for an equivalent engineering model... With flux density highest away from center (with current flowing, of course), and making the Z higher at the outside (skin). So, that increase in Z at HF would effectively leave less conductor area (effectively smaller wire gauge) thus higher Z at HF.
Can you live with that? Rather than the pure physic answer? In electronic apps we dont need exact physic to build something useful using simplified explanations and models. That is what I am looking for which isnt completely accurate nor inaccurate.
THx-RNMarsh
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And now for something completely different.
Want to do some case temperature monitoring on some plastic cased transistors (BD139 to be specific). I have some low mass Type K thermocouple probes (the ball at the end is a bit under 1mm).
Can I get a reasonably accurate reading by just touching the ball to the case, or do I need to try and drill into the case and glue it in? The devices are already installed so it would be a bit of a pain to try and drill into them now.
se
Want to do some case temperature monitoring on some plastic cased transistors (BD139 to be specific). I have some low mass Type K thermocouple probes (the ball at the end is a bit under 1mm).
Can I get a reasonably accurate reading by just touching the ball to the case, or do I need to try and drill into the case and glue it in? The devices are already installed so it would be a bit of a pain to try and drill into them now.
se
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