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SSLV1.1 builds & fairy tales
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Old 26th August 2012, 01:13 PM   #1721
necplusultra is offline necplusultra  Canada
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Greetings,

I'm building a +15 - 15 for legato.

couple of questions regarding the build.

1) when we want say 400 ma, does that mean we need 400 from both boards or is it 200 on each board.

2) how do we connect the 8 wires from both boards.

regards
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Old 26th August 2012, 03:38 PM   #1722
AndrewT is offline AndrewT  Scotland
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You need two 15Vdc regulators.
Each 15V regulator should be set for approximately the same current. The current you choose is set by the maximum peak circuit demand plus whatever you decide that the regulator needs for good performance.

You can use a pair of +ve regulators, or a pair of -ve regulators, or a -ve & +ve to create your dual +-15Vdc PSU.

You connect one channel to + - & zero volts (not a 4 wire connection).
You can connect the second channel to + - & Zero volts (again not a 4 wire connection).
Or you can build 4 regulators and connect each channel to it's own pair of regulators with a 3 wire connection.
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Last edited by AndrewT; 26th August 2012 at 03:40 PM.
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Old 26th August 2012, 04:04 PM   #1723
wushuliu is offline wushuliu  United States
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Old 26th August 2012, 04:43 PM   #1724
merlin el mago is offline merlin el mago
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For Legato only is necessary two regs, it's powered +-15VDC, I use Auricap 10u 200V for Vref.
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Old 26th August 2012, 04:48 PM   #1725
wushuliu is offline wushuliu  United States
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Quote:
Originally Posted by coolhead View Post
Sound better or worst or nothing change?
Whoops didn't realize new posts popped up in between the smiley (it's 2012 can't we be able to edit posts already?!)

as for odac, I have not connected the sslv as yet. I found the odac w/ usb power disappointing but greatly improved with a linear power supply. The sslv seems the next logical step - also I just wanted a reason to build one!
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Old 26th August 2012, 05:40 PM   #1726
necplusultra is offline necplusultra  Canada
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Thanks Andrew et.al.

I beleive what you are saying but I do not understand.

I'm building a + reg and neg reg for +-15V

What I am asking is:

1) If the requirement is 400ma for a +- dual reg, does the neg side output 200ma and the +side output 200 ma or do I need 400ma from both.

2) the legato inputs +15V, -15V and ground. The salas shunts output force and sense on both +reg and -reg. This gives me total of 8 wires from the regs, How do I connect the 8 wires into the legato 3 wires without blowing out anything.

regards.
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Old 26th August 2012, 05:48 PM   #1727
Marra is offline Marra  United Kingdom
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SSLV1.1 builds & fairy tales
Its all explained on page 3 of the Bib guide.
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Old 26th August 2012, 05:59 PM   #1728
necplusultra is offline necplusultra  Canada
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Thanks Marra,

I re-read page 3.

Just to make sure,

1)I would connect the F+,S+ from the +reg to + input of Legato
2) I would connect the F-,S- from the -reg to - input of legato
3) I would tie down the F0,S0 from + reg and F0,S0 from -reg and connect to the ground of the Legato.

Let me know if I'm OK with that.

secondly,
How do I calculate current draw from 2 regs into one device? is it split with half on each or do I configure for full current on both.

thanks again.
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Old 26th August 2012, 06:36 PM   #1729
AndrewT is offline AndrewT  Scotland
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What is the maximum peak current draw of the circuit?
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Old 26th August 2012, 06:42 PM   #1730
barrows is online now barrows
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Default Legato...

The Legato draws approximately 200 mA per rail: that is you need 200 mA from the positive regulator, and 200 mA from the negative regulator.
For the CCS current with the BiB regs, you will get good performance with 350-400 mA of current in the CCS for each (+/-) regulator.
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