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Old 5th June 2009, 02:26 AM   #471
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Hi Russ,

Are you using the LME chips on the Placid?

Edit:

What frequency range is most important, frequency and phase-wise, for the Sabre/Buffalo32S?

Thanks,
Slarti
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Old 5th June 2009, 03:15 AM   #472
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At any frequency above 1mhz the regulator (any regulator) load regulation will start to fall off dramatically. This is where bypass caps come into play.

The placid will be all through hole. With a DIP opamp. So you can use a multitude of opamps. We will likely supply LME or similar.

The power devices are TO220 full pack type and will be well heat sinked. You ought to be able to get 200ma out of each supply easily. The output current and voltage will both be adjustable.

The first iteration of the circuit will likely be a single supply. But you could easily connect two in series to get a bipolar supply.

Later I will likely do a bipolar version.

:EDIT:
I will also put a rectifier and caps on the board so you can use it directly. If you want to use a pre-regulator that is fine, too. But the line regulation is so good I can't see any reason to need to.

Cheers!
Russ [/B][/QUOTE]
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Old 5th June 2009, 08:33 AM   #473
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That's good news, Russ! Was hoping you wouldn't give up on Placid..

Any idea what kind of voltage drop will be required for the Placid to work properly?
I hope I can keep my current transformers..
They are spec'ed at 2x18V AC for IVYIIs and 2x12V AC for VD, a bit higher than the 2x15 and 2x9 recommended, having shunt regulators in mind.
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Old 5th June 2009, 12:06 PM   #474
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The placid should work fine from 5V to 20VAC transformers. I will know better once I have really tested it.

The lowest practical output is 3.3V. The highest is about 25V.

Current through the CCS can be adjusted by the user and safe operation will require appropriate setup.

I will start a dedicated thread at some point.

BTW noise should be very nice and low.

The voltage reference is an LED with RC filter, and it is supplied by the regulated voltage and a CCS to make it even more clean.

Cheers!
Russ
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Old 5th June 2009, 04:48 PM   #475
hybride is offline hybride  Netherlands
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off topic; I have a broken buffalo 1.0 and Emailed several times to questions@twistedpairaudio.com to ask where to send it back for repair.
I get no answer anymore? Why? (hanssatink(at)gmail.com)
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Old 5th June 2009, 06:10 PM   #476
brgds is offline brgds  Poland
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Quote:
Originally posted by Russ White
brgds,

Sorry if I can't be much more help. I suspect there is something else at work.

Cheers!
Russ
Russ, you were perfectly right. I’m more than happy to advise that my BUF finally started to sound as I expected – after a week of burning of the whole system, and it’s improving from day to day. I suppose I know what happened … but that would be very much OT.
The most impressive and new things are: bass – deep, well controlled, springy and rich; overall resolution; scene depth; liquidity. The only concern is a bit thin middle band with a kind of ringing on higher midds which make sometimes piano or female voice unnatural and “jazzy”. Hope that’ll disappear soon. Perhaps I should enable those 22Ohm series resistors?
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Old 5th June 2009, 06:25 PM   #477
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Quote:
Originally posted by brgds


Perhaps I should enable those 22Ohm series resistors?

Absolutely you should.
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Old 5th June 2009, 10:53 PM   #478
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This recent review at 6moons of the Peachtree Audio Nova convinces me even more that the Sabre based dacs are the way to go. Give it a read. I've only included it here because both of these companies are based on fruits

Peachtree
Twisted Pear

Best,
Anand.
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Old 5th June 2009, 11:25 PM   #479
leo is offline leo  United Kingdom
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Originally posted by Russ White
Hi Leo,

I don't have any problem with your suggestions. I am just stating what I believe to be true.

I get PMs too.

I actually very much appreciate your good will and intentions.

Cheers!
Russ

Thanks Russ!

I've been using it with the headphone amp the last few days, next step I think is to get a volumite , convert the cans to balanced and ditch the headphone amp
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Old 5th June 2009, 11:26 PM   #480
leo is offline leo  United Kingdom
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Quote:
Originally posted by nycavsr2000
This recent review at 6moons of the Peachtree Audio Nova convinces me even more that the Sabre based dacs are the way to go. Give it a read. I've only included it here because both of these companies are based on fruits

Peachtree
Twisted Pear

Best,
Anand.
Interesting, doesn't their stuff use the ESS 9006 though
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