Thanks for your reply.
I thought it may be possible to be a good cable because of the "silver plated copper covered" and skin effect, wich says that most of the current flows through the outter diameter of the core.
Then I suppose I will un-do the new interconexion I built this evening.
I thought it may be possible to be a good cable because of the "silver plated copper covered" and skin effect, wich says that most of the current flows through the outter diameter of the core.
Then I suppose I will un-do the new interconexion I built this evening.
Mmmm, not in my universe! 😀 I find this table instructive.
American Wire Gauge table and AWG Electrical Current Load Limits with skin depth frequencies
Regards,
Andy
What Cat5-6 offers you which coax does not (but twinax does! 🙂 ) is the use of solid-core wire for both signal and ground.
Although I don't use commercial twisted pair wire, I do use twisted pairs in my preamp, active XOs and power amps made from high quality solid-core copper wire with teflon dielectric (IMO, higher quality than commercial Cat5-6).
As to whether tp provides the same screening against noise that coax does ... all I can say is that, with the source selector to CD but no CD playing, I can wind the volume control on the preamp up to max and cannot hear a thing with my ears 100mm away from each driver.
So AFAIAC, it shields pretty well!! 😀 (Of course, I have arranged things so the power transformers are "hidden" behind a steel divider. 😉 )
Regards,
Andy
You could do with reading the table you have referenced.
Take a 0.9mm diameter copper wire. Frequencies below 21kHz use the whole area to transmit the signal. Effective resistance is 26r4 per km.
Use 300mm of this and you have 8milliohms for all frequencies from 21kHz and below.
Will the slight increase in resistance as frequencies above audio get transmitted be audible?
Let's look at 2mm copper. Where would you use it? air cored output Inductor or solid core to speaker terminal or main PSU rails/Ground.
What lengths are involved? 100mm? 200mm? 300mm? surely not approaching 300mm.
Take a 200mm length at 5r6 per km. Total resistance seen by signals <=4kHz is ~1milliohm.
Would the increase in resistance above 0r001 be audible for signals above 4kHz?
Skin effect can be ignored for audio signals, unless you have a circuit that depends on milliohm accuracy for good audio.
Think about your hobby and what you want from it.
I have read the table. 😛 Yes, a 21Khz signal will penetrate the whole depth of a 19g wire. But my Maggie ribbons are rated at up to 40Khz and there is certainly information in my vinyl grooves above 21Khz (my LOMC is rated at up to 30Khz) ... so I wouldn't want to use 19g hookup wire in my electronics.
Regards,
Andy
It's got nothing to do whether I can hear over 20Khz or not ... simply whether the system (in particular, the wires) delivers the signal faithfully. 🙂
And just FYI, if you listen to cymbals through a system which can deliver 35Khz and then impose, say, a 15Khz roll-off ... even though you can possibly only hear up to 15Khz, you will hear that the cymbals sound different with the roll-off in place (cymbals have harmonics which easily go to 35Khz).
Regards,
Andy
I dont use solid wire - good quality stranded cables are composed of 24 guage or smaller, wire, which puts skin effect to above 68k (or even higher if finer wire is used.)
Good for you - I don't use stranded wire ... rather, multiple insulated strands of solid-core. 😛
Regards,
Andy
in my case I use microphone cable for the input signal only and the rest I use regular 18 AWG copper cable (cheap from radio shack). Check picture.
Attachments
I usually hook up PCBs and internal wiring with cat.5 twisted pair solid core. I've been having good results, no noise or hum if using an appropiate grounding scheme.
But I was wondering about using coaxial cables for internal wiring. Is there any important spec or I can just use the typical plain coaxial wire used for TV? Is it any good for interconnects too?
But I was wondering about using coaxial cables for internal wiring. Is there any important spec or I can just use the typical plain coaxial wire used for TV? Is it any good for interconnects too?
i've just stumbled over this thread.
I'm interested in using coaxial cable for the internal signal wiring for an unbalanced amp and curious as to how people are wiring it together.
Is it a case of the solid core for the signal and the shield for the return. Or both signal and return run in two parallel wires with the both shields connects to signal gnd ?
cheers
I'm interested in using coaxial cable for the internal signal wiring for an unbalanced amp and curious as to how people are wiring it together.
Is it a case of the solid core for the signal and the shield for the return. Or both signal and return run in two parallel wires with the both shields connects to signal gnd ?
cheers
I think I would connect, for channel A for example, the signal to the core of the coaxial. And then solder or attach the shield to the case, ONLY in one end.
Then I will connect another cable the same way: The return to the core and the shield to the case.
Is that alright? Is standard TV cable suitable?
Then I will connect another cable the same way: The return to the core and the shield to the case.
Is that alright? Is standard TV cable suitable?
I remember reading somewhere that higher ( inaudible!) frequencies ARE sensed by the brain and processed ( by it's Bentium processor !)😀... though not like 'audible signals'. However it appears to affect the way 'audible' signals sound ... like 'texture' of the sound.
Anybody have any links to any good articles on this ?
Well, in my case, I don't like to use "strong, hard wire" because with some vibrations and movements of amp, the hard wires "can get lose" or the solder "can get broken".since the hard wire does not have the same flexibility as the strain wires.
Flexible wires will not suffer this problem with vibrations or movements. This is just my opinion.There will be some members saying the appositive and advantages of hard wires.
The first way.
It's doubling your use of cable and increasing your emi pickup within the case. Also, the case should only have one ground point on it.
It would be nice to know if we can use the standard TV cable which lots of us have around. Now I know that it could be bad because it is too hard to bend and heavy but, if properly attached to the case, could it be appropiate?
Thanks
Thanks
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