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Old 22nd February 2010, 02:04 PM   #71
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Default Pull down resistor value

Really looking forward to receiving my Buffalo II next month.

In the mean time I gathering/resurrecting my I/V options. Can you tell me the value of the "pull down" resistors?

I am planning to try a transformer conversion, a Welborne Cato set-up, a Borbely board if I can reserrect 24V supplies and a Lampizator V out.

Thanks for providing such a great experimental platform.

Best

Bob
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Old 23rd February 2010, 03:07 AM   #72
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Quote:
Originally Posted by NicMac View Post
OK, back on topic! - I have a dual mono Buff II in pre-order and I have a few questions:
1) Any suggestions for "stacking" these modules using high quality "plug" connectors rather than wires? Digital signal input, Volumite (I2C) and output stage?
2) What is the current draw of the IVY III positive and negative rails?
3) What is the current draw of Buff II @ 5V?
Thanks,
Nic
1) The connector Brian has selected for the kits is excellent.
2) An IVY III does About ~90ma per rail. If you set the Placid BP for 150ma you will be in great shape.
3) I would run ~5.5V(but not over). About ~290ma I would set the placid for about 350-400ma.

Cheers!
Russ
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Old 23rd February 2010, 06:50 AM   #73
needsp is offline needsp  United Kingdom
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Hi Russ

So 90mA per rail in total But how much current will each rail of each of the three sections of IVY III draw (with a 15/0/-15V supply)? I.e. L, R, and ballsie?

Thanks

Paul
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Old 23rd February 2010, 07:17 AM   #74
NicMac is offline NicMac  Italy
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Quote:
Originally Posted by Russ White View Post
3) I would run ~5.5V(but not over). About ~290ma I would set the placid for about 350-400ma.
If I recall right this is a bit more than B32S. Is this with the dual AVcc shunts installed?
Thanks,
Nic
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Old 23rd February 2010, 10:47 AM   #75
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Quote:
Originally Posted by NicMac View Post
If I recall right this is a bit more than B32S. Is this with the dual AVcc shunts installed?
Thanks,
Nic
Yes, that's with the AVCC shunts. They consume about 50ma per side. So 100ma.
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Old 23rd February 2010, 10:49 AM   #76
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Quote:
Originally Posted by needsp View Post
Hi Russ

So 90mA per rail in total But how much current will each rail of each of the three sections of IVY III draw (with a 15/0/-15V supply)? I.e. L, R, and ballsie?

Thanks

Paul
About 35ma per side and about 20ma for the bal/se per rail.
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Old 25th February 2010, 11:53 PM   #77
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Default BUF II dual mono.

Here is a diagram of the balanced dual mono output configuration.

Cheers!
RussAttachment 159883
Attached Files
File Type: pdf buf II with IVY dual mono.pdf (30.5 KB, 393 views)
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Last edited by Russ White; 22nd April 2010 at 10:51 PM.
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Old 28th February 2010, 09:07 PM   #78
glt is offline glt  United States
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Does the diagram imply that half the dacs of one ESS are in anti-phase mode?

If all the DACs are in-phase, wouldn't it be simpler to just connect both +V and both -V of one DAC together and then use a single IVY?
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Last edited by glt; 28th February 2010 at 09:13 PM.
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Old 28th February 2010, 09:12 PM   #79
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Quote:
Does the diagram imply that half the dacs of one ESS are in anti-phase mode?
It does indeed.
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Old 28th February 2010, 09:25 PM   #80
NicMac is offline NicMac  Italy
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I'm interested (having a set of BII's on order). I guess that the phase of each DAC is set by the C so why not have them all in the same phase and use a single IVY? I guess stacking would not be possible any more, but beside that?

Last edited by NicMac; 28th February 2010 at 09:26 PM. Reason: typo
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