I don't believe cables make a difference, any input?

[simon7000]

Originally Posted by jackinnj

R67 of Figure 1 isn't labeled as to value. Are the values of R62 and R63 correct?

R67 actually is not needed in this application because there is a load on the output. I usually use 100K in this type of application to be sure the capacitor has a place for the DC offset to go to ground.

Wowie! you found a typo yes the values in the table for R62 and R63 are swapped.

Thanks

[john curl]

Auplater, have you ever read Ragnar Holm's book 'Electric contacts'? If you have not, we have nothing to discuss at this time.

[aardvarkash10]

Originally Posted by john curl

Auplater, have you ever read Ragnar Holm's book 'Electric contacts'? If you have not, we have nothing to discuss at this time.

Synopsis?

[andy_c]

Originally Posted by auplater

All this talk about surface problems with interconnects is anecdotal at best. I've yet to see anyone do any sort of ANOVA , screening, or any other experimental design using interconnects processed thru cleaning and insertion trials, post results along with conditions and evaluation criteria. All we ever see is "I heard a difference, so this must be the cause".

Thanks for this info, John L. The lack of real data on this subject is also something I've noticed, so that's why I'm interested in Ed's article and any other info I can find.

[simon7000]

Originally Posted by auplater

All gold plated over any copper alloy needs an intermediate layer of nickel, palladium, or some other metal to prevent diffusion of copper through the plating. Unfortunately, I doubt many vendors do this (or even know the problem exists, otherwise they'd use it in ad copy)

John L.

Surprise! If you read what I wrote you would see that is one of the results of the measurements! Plated contacts really behave much like the base metal.

There is a type of plating that I every so often see on the cheap imported connectors that starts out bright and shiny silver and after a while gets a white film. At that point most of the connectors just stop conducting low level signals. Cleaning them so that they work is a very short fix, the oxide comes back. That is what I called bright and shiny it is always interesting to see how others read things and even more interesting to see how those who did not react.

By the way what is the conductivity of electroplated copper? It measures different than annealed copper.

[BudP]

auplater,

Good Lord John! You got off of your rant stand and provided really sensational information! Thank you!

Bud

[auplater]

Originally Posted by simon7000

Surprise! If you read what I wrote you would see that is one of the results of the measurements! Plated contacts really behave much like the base metal.

There is a type of plating that I every so often see on the cheap imported connectors that starts out bright and shiny silver and after a while gets a white film. At that point most of the connectors just stop conducting low level signals. Cleaning them so that they work is a very short fix, the oxide comes back. That is what I called bright and shiny it is always interesting to see how others read things and even more interesting to see how those who did not react.

By the way what is the conductivity of electroplated copper? It measures different than annealed copper.

Actually, I did read the whole post... you seem to misunderstand the ramifications of copper diffusion through thin gold plating... it corrodes and leaves a non-conductive film or worse... bad practice. Behaving like the base metal has nothing to do wrt passing signal, other than loss of contact, which seems pretty obvious to me.

the cheap=o connectors have either zinc plating or they have a flash coating of tin or solder. Not good, never have used them.

Who uses electroplated copper on interconnects? maybe a flash layer if made from steel, but who wants steel terminations. Electroplated copper can be very highly conductive, again it depends on the conditions under which it is produced. Hey, you don't have to believe anything I say, just passing on decades of experience, experimentation, and succesful commercial electrochemistry.

Cheers

John L.

[john curl]

Who was Holm, and what did he say about gold?

[auplater]

Originally Posted by BudP

auplater,

Good Lord John! You got off of your rant stand and provided really sensational information! Thank you!

Bud

glad to be of help... I've posted this before a few years back.. but what goes around, comes around, I guess...

BTW: I was reading more about meta-materials and how they are used for "cloaking" of objects to make them invisible... Klingon-ish... maybe the EnaBL methodology could be related to cloaking of the bad behavior aspects of the micro-dynamics in the signal, somehow making the main information carrier transparent to their effects? Maaybe rename the process to SoniCloak

l8tr

John L.

[Pit Hinder]

No cable can improve the signal sent through it. 5c pennypinching on the connectors can do helluva job spoiling it.