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Old 15th February 2012, 08:53 AM   #51
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Schematics would me more that welcomed...

Or even better, the possibility to acquire complete input buffers ready for plug n play.

Do you have any up for sale?
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Old 15th February 2012, 11:39 AM   #52
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I can't disclose more in this forum.
Nor can I sell the kits because these are other people's IP
I ve already disclosed too much...............
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Old 28th February 2012, 07:23 PM   #53
jalejos is offline jalejos  Spain
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I recently installed two monophonic units,

but for the speakers I hear this noise.
https://files.me.com/jalejos/hxoklw.wav

I can not determine whether it is a ground noise or that the units are defective (two units?).
Would you need a line filter?
¿Coils in the speaker wire?
Does changing the earth?

Any idea?
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File Type: jpg img8373z.jpg (141.5 KB, 215 views)

Last edited by Pano; 13th January 2013 at 03:45 PM. Reason: fixed photo
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Old 28th February 2012, 08:31 PM   #54
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THe input is way to close to the output terminals. Take care can run into oscillation.

Last edited by Erlend Sæterdal; 28th February 2012 at 08:46 PM.
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Old 28th February 2012, 08:45 PM   #55
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And to close to the toroid ! This is a very very bad layout. Many amps have gone up in smoke because offf this kind of layout !
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Old 28th February 2012, 09:42 PM   #56
jalejos is offline jalejos  Spain
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Oooops!
I was wrong picture. Although the problem I think may be the same.
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Last edited by Pano; 13th January 2013 at 03:49 PM. Reason: fixed photo
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Old 29th February 2012, 07:00 PM   #57
jalejos is offline jalejos  Spain
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Thank you very much. This weekend will prove it.
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Old 15th May 2012, 07:17 AM   #58
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can anyone advise as to whether an input buffer affects sound quality regardless of the pre-amp used or is it just pre-amps such as tube or passive types.thanks
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Old 3rd September 2012, 11:00 PM   #59
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Default More info related to the Bel Canto AC Input Board...

Quote:
Originally Posted by jalejos View Post
According to these articles, if you connect the output of a PFC to AC input of ASP1000, would it work?
The PFC output 385VDC, does not affect the input circuit (oscillator) of ASP1000?
That 385v seems to work based on the pictures of the Rowland amps.

The Bel Canto board likely produces closer to 320v based on this article and circuit from Wikipedia:

Rectifier - Wikipedia, the free encyclopedia (see Voltage-multiplier rectifier section)

File:SwitcheableRectifier.jpg - Wikipedia, the free encyclopedia

Anyone gotten any more info on the Bel Canto board other than what the Wikipedia article implies. I did get these pictures from someone who had one of the amps, but no more info than that. Still looks like a pretty simple mod, but I'd really like to get my hands on one or get info from someone who has before risking my modules.

Greg in Mississippi

P.S. Best as I can tell, the Bel Canto board matchs the full-wave bridge voltage doubler circuit... my guesses based on the pictures are that it contains:

1. An input filter cap (black .33uf 250v x2 cap)

2. A fuse

3. 4 rectifier diodes for a full-wave bridge

4. A couple of high-voltage (200v?) electrolytics

5. A jumper plug to set 120v or 240v operation (voltage doubler or regular rectifier)

6. A couple of bleeder resistors

7. An output bypass cap

But there are a couple of small components between the rectifiers and the first cap that I can't make out... one looks like a surge protector, but funny to see it so far downstream. The other I can't make out at all.

Can anyone get to to one of these and get more intel?
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File Type: jpg scaled_20120614_153030.jpg (455.0 KB, 333 views)
File Type: jpg scaled_20120614_153054.jpg (421.3 KB, 331 views)
File Type: jpg scaled_20120614_153130.jpg (465.8 KB, 300 views)
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Last edited by Greg Stewart; 3rd September 2012 at 11:15 PM. Reason: Add some speculation about the Bel Canto circuit
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Old 26th November 2012, 04:11 AM   #60
ddeacon is offline ddeacon  United States
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Yes, I do have 500ASP for sale. Please contact me at d_sonic1@yahoo.com for further information.

Dennis
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