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Old 8th March 2012, 01:18 AM   #1
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Default Umbilical cord construction

I am thinking about a separate power supply for my Tubelab SE and need some advice about how to make the umbilical cord. I have about three feet in mind.
Need advice about wire size, connectors, etc.
thanks for any help
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Old 8th March 2012, 12:23 PM   #2
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I can't offer much insight, but I recently spent a lot of time in the understanding star grounding thread, and I think I recall a few pages that were dedicated to connector type and selection and grounding schemes for umbilical cords and external power supplies.
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Old 8th March 2012, 02:42 PM   #3
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Default Umbilical

Thanks for referring me to the grounding thread. Lots of helpful information there.
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Old 9th March 2012, 12:45 AM   #4
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Try these plugs. http://www.mouser.com/Catalog/catalogusd/645/1499.pdf
http://www.mouser.com/catalog/catalogusd/645/1525.pdf
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Old 9th March 2012, 01:38 AM   #5
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Default Umbilical

Thanks Evenharmonics--that's very helpful. Lots of choices and adequate current and voltage ratings.
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Old 9th March 2012, 01:43 PM   #6
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How much power supply will be located remote from the amp?

I used Tubelab's PCB and only had the power transformer remote since the board makes it convenient to hang on to the caps.

I used a 9 pin Amp circular plastic connector to mount the power tranny on a separate enclosure, and I ended up needing all 9 pins to do it. I had some hum and needed to run a separate ground for the CT, and fortunately I had one extra conductor to do it. I originally had the transformer CT grounded in the PS chassis, all the grounds in the amp chassis tied together and one conductor tying the two chassis together. I ended up with the CT on one umbilical conductor and the chassis grounds on another.

The gory details are here:

Reducing filament hum in a Tubelab SE

I had a piece of Belden 9 conductor cable, but you can easily use separate wires in braided sleeving, just make sure the wire insulation voltage rating is adequate (600V rated wire for B+ conductors)

The Amp circular plastic connectors (CPC series) are affordable and are available in several shell sizes, sexes, pin counts and tin plate or gold plated pins. Also make sure your live power supply side connector is sockets to avoid the potential of having live voltage on pins when the connector is disconnected (assuming you want a connector). The pins for these require a crimper.
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Old 10th March 2012, 01:55 AM   #7
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Default Umbilical

Thanks Boywonder. There's a lot to consider when using an umbilical setup--putting everything on one chassis is becoming more attractive.
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Old 10th March 2012, 08:26 AM   #8
qusp is offline qusp  Australia
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if youve got the budget and a fetish for milspec connectors you really cant go past the ITT cannons
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Old 11th March 2012, 06:03 PM   #9
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Quote:
Originally Posted by qusp View Post
if youve got the budget and a fetish for milspec connectors you really cant go past the ITT cannons
.....or Amphenol metal shell connectors........these were leftovers from a medical device prototype built about 10 years ago....
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Old 11th March 2012, 06:45 PM   #10
qusp is offline qusp  Australia
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yep, i picked up a box of the above for a song from the FS section here @ 100EU for 10 x cable mount and 7 x panel mount, gotta be happy with that. they still make that model, nearly 140ea and ~50ea respectively at Farnell =) I like the amphenol too, but not as much as the Cannons. the Amphenol are more readily available than the ITT as the ITT have export restrictions.

I use the Amphenol hybrid Dsub mixed signal umbilical connectors too, very nice.
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Last edited by qusp; 11th March 2012 at 06:47 PM.
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