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Old 29th August 2007, 02:47 PM   #1
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Default Multiple secondaries toroid

Newbie here- about to buy GC kit... (have COMBED this board for info)

I have a 300Va toroid from an old outboard Velodyne power amp.

There are 4 pairs of leads + the sleeved primaries.
-2x20V and 2x24V

My question is: how do I connect these to a kit PS?

Should I leave any unused, etc.

Thanks!

P.S. I'll be bi-amping with the GC, a pair of current hungry ATC 4ohm.
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Old 29th August 2007, 04:51 PM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
are the secondary wires identical?
It will give a clue on the VA of each winding.
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Old 29th August 2007, 05:09 PM   #3
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Post Exact lead info

Here's what I was told by Toroid Inc. (maker):

Orange/Red= 23.7V

Red/Grey= 20.4V

Gray/Orange= 20.4V

Orange/Yellow= 23.7V

"309 Va, grays are center tap/become ground"

Thanks Andrew!
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Old 29th August 2007, 05:27 PM   #4
AndrewT is offline AndrewT  Scotland
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Hi,
that's only the voltage info.
You need VA and/or current to determine the correct wiring up.
are the 20V & 23V separate windings or tappings off the same winding?
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Old 29th August 2007, 05:33 PM   #5
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I was told 3.5a by the manufacturer

Thnks!
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Old 29th August 2007, 05:35 PM   #6
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Quote:
are the 20V & 23V separate windings or tappings off the same winding?
They are all separate windings. As the man. told me.
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Old 29th August 2007, 05:37 PM   #7
AndrewT is offline AndrewT  Scotland
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please confirm if this is correct:
four separate windings all rated at 3.5A, using the same wire for each.
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Old 29th August 2007, 05:56 PM   #8
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Quote:
four separate windings all rated at 3.5A, using the same wire for each.
Yes, 4 separate windings (8 individual leads)
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Old 29th August 2007, 06:09 PM   #9
AndrewT is offline AndrewT  Scotland
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the 20Vac will give about +-29Vdc
24Vac about +-35Vdc.
The higher voltage will suit the less sensitive driver.

Running separate windings requires dual rectifiers on each amplifier supply if you want to arrange a star audio ground for each.
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Old 29th August 2007, 06:16 PM   #10
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Thanks again (newbie overflow of gratitude).

I was planning on running the standard chipamp stereo kit.

With this setup can I just use the 2x24Vac windings and insulate off the other 2?
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