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Old 24th June 2011, 02:25 PM   #21
von Ah is offline von Ah  United States
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Quote:
Originally Posted by ddeacon
4) Input buffer PCBs, raises impedence to 500K ohms
Is there an extra zero there?
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Old 30th June 2011, 08:56 PM   #22
ddeacon is offline ddeacon  United States
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Yes, there is. The impedence is actually 48Kohm differential mode and 10Mohm (yes, 10,000,000) common mode at 60Hz.

Dennis
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Old 4th July 2011, 11:16 AM   #23
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Which of the following options would you recommend for the input to raise de input's inpedance and improve Common Mode Rejection:

Input transformer (Lundhal)

or

Diferential Buffer

or

Both
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Old 4th July 2011, 06:15 PM   #24
ddeacon is offline ddeacon  United States
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I would prefer to use the input buffer circuit as it does not color the sound if properly designed. The Lundahl 7902 is the only input transformer I have heard that sounds good with the ICEpower modules but it does give the modules a warmer, tube-like coloration in my opinion. The music seems to lose a touch of liveness. Many people like this coloration.

You would never want to use both an input buffer PCB and an input transformer at the same time.

Regards,

Dennis
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Old 5th July 2011, 01:58 PM   #25
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Quote:
Originally Posted by alvinlim View Post
Please clarify on 'yes' . 'YES', there will be a problem if I use 385V DC into the 240V AC power input into the Icepower module, or, 'YES', i can do that without issues.

i looked at the ICEpower specs, and they only specified AC.
From what I've been told from a friend of mine the 385VDC comes from the fact that for an input voltage of 240V r.m.s (uk) for +/- 10% therefore can reach 265Vac which in terms Max. Voltage Vp = 375V, and voltage rating of the output caps should be of about 385V hence the figure 385V for the DC Output.
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Old 6th July 2011, 05:22 PM   #26
toufu is offline toufu  United States
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Has anyone tried using the B1 buffer with ASP1000? I have a pair of ASP1000's and using my Aikido preamp, thought the top was a little too soft and too mushy.
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Old 8th July 2011, 07:17 AM   #27
gazza49 is offline gazza49  United Kingdom
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Hi,i use my asp1000,s with a dodd battery buffer and by changing the valve you can change the output impedence, each valve i try makes a noticable difference to the sound.A version of this buffer is used by Virtue audio on there ice powered amps.

Last edited by gazza49; 8th July 2011 at 07:20 AM.
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Old 12th August 2011, 06:28 PM   #28
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Default Potential Group by for Balanced Input Buffers with Ingenius 1200 IC from THAT Corp.

Hey guys,

Who is interested on buying input buffers using the Ingenius 1200 input buffer?

I'm interested on buying a couple of them (maybe 5) but in order to buy them it is necessary to achieve a number of boards that justify the production.

In case any one's interested I could start a group by thread for input buffers using the Ingenius 1200 IC from THAT Corp.

Please let me know...

In that case I would have to ask ddeacon to step in and define the price for a target number of boards.

Cheers
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Old 20th August 2011, 07:17 PM   #29
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Quote:
Originally Posted by ddeacon View Post
I would prefer to use the input buffer circuit as it does not color the sound if properly designed. The Lundahl 7902 is the only input transformer I have heard that sounds good with the ICEpower modules but it does give the modules a warmer, tube-like coloration in my opinion. The music seems to lose a touch of liveness. Many people like this coloration.

You would never want to use both an input buffer PCB and an input transformer at the same time.

Regards,

Dennis
Have you tried the Lundahl 1540 ? I allready have them and consider to try. A friend of me that have close connection to B&O designers of the ICE power tells me he have never heard ICE Power without modifications that can play music.
I heard modified ASP 500 by him and I was very impressed. He told me he has changed 60 components in the circuit. Ceramic caps is not a must in Class A design. It IS possible to change them to other types without oscilations. So I just ordered 66 Silver Micas from Lituania . My plan is to exchange every ceramic that is possible to a combination of Silver Mica 10 nf. and the Vishay 1837 or maybe the Black Gate NX High Q.

He also told me the high noise in the ground plane can affect the performance of other components in the stereo.

Because of that I would like galvanic isolation at the input of my Coldamps wich is allready very good. I have allready done som other modifications.
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Old 22nd August 2011, 04:43 AM   #30
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Default input buffers

Tiff: I am interested in balanced to balanced input buffers for a pair of ASP 500 mono blocks I have. Would love to get the input impedance up to 50 k per phase or more. I would be in on a group buy for a small board which includes wiring for power and signal to and from the ICE module.
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