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Alexontherocks 13th February 2012 09:37 AM

PtP wiring: Solidcore unshielded cable
 
Hi all, just a quick question I had no luck answering using the forum's search engine.

I must complete a driver board which will be long and thin and positioned in a tight squeeze. Amongst other material I have found 25m of escellent solid core AG/CU wire 1mm thick. It is a breeze to solder, rigid enough to be shaped and is new (in hermetic bag).

http://i365.photobucket.com/albums/o...2-13113228.jpg

Can I use it for the onboard connections? I would use it to provide some framwrok to other components. All HV cables will be Teflon/silk soft wires but for signal path I could definetely use a rigid wire. Is there an issue with using it even tough it is lacking insulation? Is there an audible difference?

Thanks

DF96 13th February 2012 11:17 AM

Ideal for wiring VHF/UHF circuits. For audio it is just a piece of wire.

Alexontherocks 13th February 2012 11:37 AM

So I can use it without fear of noise/hum ecc? For signal transport within the casing I will use good signal wire with excellent shieldding but for board wiring I wanted to use this.

M Gregg 13th February 2012 11:59 AM

Quote:

Originally Posted by Alexontherocks (Post 2904525)
So I can use it without fear of noise/hum ecc? For signal transport within the casing I will use good signal wire with excellent shieldding but for board wiring I wanted to use this.

I sleeve this type of wire with PTFE, any input signal wires should be screened to the grid or input caps. You can make your own using PTFE insulated single cable and screening with aluminium foil with bare drain wire wrapped around the foil cover with heat shrink.:) ground the drain wire to chassis. Only at one end.


Regards
M. Gregg

DF96 13th February 2012 12:05 PM

Whether wiring introduces noise or hum depends on things like where the wiring goes, what loops it encloses, what if any screening it has, whether it is near grounded metal etc. How thick it is is almost irrelevant (except that thicker wire will have slightly higher capacitance to other objects) and what it is made of or plated with affects how easy it is to solder. As I said, it is just wire.

Bare wire can be harder to get right, simply because you have to use spacing in lieu of insulation so you get bigger loops.

data 13th February 2012 12:30 PM

For single solid core signal wire I would use a thinner wire, say .7mm and copper only, but the copper aspect is just my preference.

Conrad Hoffman 13th February 2012 12:45 PM

On a positive note, if you look inside classic General Radio Corp. test gear like bridges and resistance boxes, you'll find many things wired with heavy tinned copper buss wire. Without insulation you don't have to worry about increased capacitance and dielectric constant of the insulation. OTOH, using small gage wire reduces capacitance too.

photos of how GR did things

data 13th February 2012 02:13 PM

Thanks for that link, Conrad.

Just to add to my other post, if solid copper you can prevent oxidization by treating with DeOxit Gold, or... I have heard that Lanolin works too.


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