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Yet another sticky.


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What is the inductance in the cable, and how does the AWG affect it?  Do you have a histogram or anything?

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John,

Did you find anywhere that they have locking dc barrels in screw terminals?  I am trying to replace the external power supply of my preamp and it uses a locking 2.5mm  input on the pre, and the pickins are slim...i.e none that I can find.

 

BTW, I found some Canare starquad cabling, thanks.

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none of the above, @Middy

 

I believe what he's talking about is something like those here below:

 

 

p15_a_300.jpg


Qnap HS-251+ NAS (powered by an HD-Plex 100w LPS) > Cirrus7 Nimbini v2.5 Media Edition i7-8559U/32/512 running Roon ROCK (powered by a ZeroZone 19v/5A LPS) > Lumin U1 Mini (powered by a Vinnie Rossi Mini Pure-DC-4EVR LPS) >  UpTone Audio ISO Regen (powered by an Uptone Audio UltraCap LPS-1.2) > Metrum Acoustics Adagio NOS digital preamplifier + First Watt SIT 3  power amplifier (or Don Garber Fi "Y" 6922 tube preamplifier + Don Garber Fi "X" 2A3 SET power amplifier, both powered from an Alpha-Core BP-30 Isolated Symmetrical Power Transformer) > Klipsch Cornwall III

 

headphones system:

Cirrus 7 > Lumin U1 Mini > Metrum Adagio > Pathos Aurium amplifier (powered by an UpTone Audio JS-2 LPS) > Focal Clear headphones

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While the AWG along with some other parameters do have some affect on the loop inductance. It's the closeness of the opposite conductors that has the most effect. With low voltage DC supplies, thin insulation is good. We don't need 600V rated wires.

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2 hours ago, pl_svn said:

none of the above, @Middy

 

I believe what he's talking about is something like those here below:

 

 

p15_a_300.jpg

Haha I missed the locking point. Thanks. 

May be john posts a picture of his mini test cable..??

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1 hour ago, Middy said:

Haha I missed the locking point. Thanks. 

May be john posts a picture of his mini test cable..??

Here you go!

 

DIY_DC_cable.thumb.jpg.16de00b3d3aa0300201673e388d521c8.jpg

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7 hours ago, Ralf11 said:

What is the inductance in the cable, and how does the AWG affect it?  Do you have a histogram or anything?

I don't have the test equipment with me to measure it right now (I have to wait until the lab is setup in the new house). I cannot find any simple equations for these things. Actual formulas for inductance of the different implementations turn out to be very complex, I could not find anything that wasn't several pages of arcane math.

 

The best I could do is the rough ratios between geometries assuming everything else is the same.

 

John S.

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6 minutes ago, JohnSwenson said:

 

 

John, check your CA messages (PMs), please.

 

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1 hour ago, ted_b said:

For my request, locking and 2.5mm size.  Thx

 

Here you go Ted. https://www.amazon.com/SWITCHCRAFT-760K-CONNECTOR-POWER-PLUG/dp/B005T7HW4Q/

 

Of course you have to solder it. Pain in the next with star-quad--and why I use the Oyaide plugs for big star-quad.  That's why John is suggesting the CCTV screw-terminal barrel plugs.  Big(ish) wire, and great for easy 'Y' cables, experiments, LPS-1 series connection, etc.  

 

Besides the Oyaide plugs, the only DC barrels that are any good at all are the Switchcraft and CUI.  And CUI does not make plugs with locking nuts.  So that leaves the above Switchcraft.

 

Ciao,

ALEX 

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6 hours ago, Superdad said:

 

Here you go Ted. https://www.amazon.com/SWITCHCRAFT-760K-CONNECTOR-POWER-PLUG/dp/B005T7HW4Q/

 

Of course you have to solder it. Pain in the next with star-quad--and why I use the Oyaide plugs for big star-quad.  That's why John is suggesting the CCTV screw-terminal barrel plugs.  Big(ish) wire, and great for easy 'Y' cables, experiments, LPS-1 series connection, etc.  

 

Besides the Oyaide plugs, the only DC barrels that are any good at all are the Switchcraft and CUI.  And CUI does not make plugs with locking nuts.  So that leaves the above Switchcraft.

 

Ciao,

ALEX 

LOL, if I could solder the world (of Amazon) would be my oyster.  Thanks anyway.

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Just for the Brits.

I found this place that does by the metre quite cheap.

http://www.canford.co.uk/CANARE-L-4E-STARQUAD-MICROPHONE-CABLE-Deployable

 

Not for manufacturing but hobby cable.

for a male to male cable could you maintain resistance capacitance  if you only fitted one wire in a receptacle by soldered its twin onto that lead?.  Ect strip the sleeve back but the reverse on the other end.

One in receptacle  solder twin onto that cable.

Reverse on the other end so the net length is equal on the 2 wires.

Hot and ground.

Bypassing the need for the expensive connector?  but keeping resistance capacitance equal

Rather than forcing 2 wires in a small hole?

Just a thought...?

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Some links you guys may like:

http://www.dx.com/p/5-5-x-2-5mm-dc-female-to-5-5-x-2-1-dc-male-adapter-for-laptop-black-2-pcs-194869#.WPpVbVQ8yhA

 

http://www.dx.com/p/free-welding-5-5-x-2-1mm-female-male-power-supply-adapters-black-428277#.WPpVyFQ8yhA

 

http://www.dx.com/p/5-5-x-2-1mm-cctv-dc-power-female-jack-connector-10-pack-44060#.WPpV61Q8yhA

 

http://www.dx.com/p/lson-dc-5-5-x-2-1-monitoring-power-plug-10-pcs-279662#.WPpWD1Q8yhA

 

http://www.dx.com/p/12v-storage-battery-crocodile-clip-to-dc-5-5-x-2-1-male-adapter-cable-423416#.WPpWM1Q8yhA

 

And I suppose you manage to search that site yourself easily ?

 

Any tip tip on cheap cables ?

 

Or one of us purchase the Belden or any cable suggest and chop it up in desired length. 

We use a open shearable spreadsheet with address for easy printing labels and overview of the total length.

 

I'm in for 6". If anyone like to do, start a new group purchase thread. 

 

 

 

 

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I have bought this 14awg DC cable from these guys http://www.ebay.com/itm/272519397091

They were extremely helpful providing me a special order for a low price. I would'nt hesitate to ask them for a starquad, but you'll might have to explain it to them! ?


Auralic Aries Mini, Ariston RD40 & Mytek Brooklyn DAC system with Fostex TH900 & Gibson Les Paul 8 reference monitors.                           

Learn from the mistakes of others. You can never live long enough to do them all yourself. Graucho Marx

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Out of time for editing. 

 

The self cost price for the cable just above  $1 pr. ft. 

So the guy that do this can change between 1,5 or 3 pr. ft. Depending on length ordered. And we should still be quite happy. 

 

I dont mind do, but Norway is overpriced, so just order the cable will be a double cost here. 

 

Just as as an example 

http://www.newark.com/belden/8489-060100/unshielded-multiconductor-cable/dp/87K6285

 

http://www.newark.com/belden/8489-060u500/unshielded-multiconductor-cable/dp/87K7185 (free shipping)

 

My self cost in Norway would be $1,2 pr. ft. if I purchase 500 ft. 

(If I bought this one http://no.mouser.com/Search/Refine.aspx?Keyword=566-8489-500). 

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1 hour ago, Superdad said:

You should twist in the other direction. B|

 

o.O

 

dammit: I have too to redo mine xD


Qnap HS-251+ NAS (powered by an HD-Plex 100w LPS) > Cirrus7 Nimbini v2.5 Media Edition i7-8559U/32/512 running Roon ROCK (powered by a ZeroZone 19v/5A LPS) > Lumin U1 Mini (powered by a Vinnie Rossi Mini Pure-DC-4EVR LPS) >  UpTone Audio ISO Regen (powered by an Uptone Audio UltraCap LPS-1.2) > Metrum Acoustics Adagio NOS digital preamplifier + First Watt SIT 3  power amplifier (or Don Garber Fi "Y" 6922 tube preamplifier + Don Garber Fi "X" 2A3 SET power amplifier, both powered from an Alpha-Core BP-30 Isolated Symmetrical Power Transformer) > Klipsch Cornwall III

 

headphones system:

Cirrus 7 > Lumin U1 Mini > Metrum Adagio > Pathos Aurium amplifier (powered by an UpTone Audio JS-2 LPS) > Focal Clear headphones

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Time out again. 

 

Fright world wide is max $6,5, if weight below 350 gram. 

 

I'm sure an US citizen can do better. 

 

So if I assume average buyer is 3 feet. And I charge close to $3, that should be around $15 including everything. 

Probably to expensive ?

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