I am building the 8084 kit for use inside of an old bakelite radio enclosure. In order to re-use the existing holes, I will need to mount the potentiometers off the PCB. (approx 10-15cm each)
I am curious as to what kind of cable I can use to avoid introducing hum/noise/…?
I was originally thinking about using S/STP cabling (en.wikipedia.org/wiki/File:S-STP … nglish.png), but don’t know if that would be the correct approach, since I don’t know which contacts can be “paired”
I could use all individually shielded wires (coax), I have enough room to do that, but it will take more effort to wire everything cleanly.
In any case, where should I ground the shield to? Potentiometer casing or one of the terminals? Or straight to the transformer ground?
nobody who can help me?
Let me rephrase my question then.
Is there a negative effect of using a balanced cable (twisted pairs) for connecting the potentiometers?
If no, does it matter which contacts are getting paired?
Would I be better of by using a ribbon cable, with no shielding and no pairing?
Would there be a side-effect of using a twisted-pair cable?
There are 2 rows of 3 pins on each potentiometer.
Can I connect row 1, pin 1 and row 1, pin 2 with a pair, then row 2, pin 1 and row 2, pin 2, and lastly row 1 pin 3 and row 2 pin 3?
I would also recommend a shielded cable.
When I was youngsize=85[/size] I was told that the shield should be connected only at the side were the signal goes/runs to.
I will experiment with several types of shielded cable, and will let you know what worked.
should have all my components by the end of december, so somewhere in January, I’ll be able to test and report back
Thanks for the info on connecting ground only on one side, Deskstar. I will keep that in mind!
That’s a coax cable. If you use that cable you will need to connect both ends of the shield.
I would suggest to use a shielded cable with two internal leads.
Something like this: conrad.ch/ce/de/product/1179 … a?ref=list
(can be thinner leads though)
Regards
Edit:
Just read that you want to use inividual cables.
You mean two of those?
No, I meant running 6 individual mini coax cables (3mm outer diameter, 0.08 sq. mm conductor) so each wire would be shielded individually.
It was unclear to me if the individual wires needed to be shielded from each other too, that is why I was considering the individual coax cables.
Maybe I should have used the term “wires” to indicate that I might go that way.
I really have no clue where to start on this, that’s why I came here
I have not yet ordered any cable. I just have the kits, and the rest of the components.
This are 3 normal copper wires, in a shielded cable. That would mean I have 2 cables per potentiometer instead of 6. It would certainly make things easier.
I meanwhile found a very interesting overview about avoiding hum and noise, which further details a lot of “best practices” I will try and keep in mind: http://midimagic.sgc-hosting.com/nonoise.htm
I did some more research and reading up on the subject (will it ever be done? )
And in the end ordered “Kabeltronik 096062009” cable. This is a double-shielded cable consisting of 6x0.5mm2 conductors, and should fit my application quite well.
I also ordered a small aluminium enclosure to place the board in, as multiple sources suggest the board by itself picks up RFI/EMI like crazy, and it will be mounted quite close to various emitters.
