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Old 27th March 2011, 09:04 AM   #1
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Hi All ,

been enjoying my amp while recovering from my hip replacement . I must say, a little bit off morphine mixed with already amazing sound has made the immobility pleasantly tolerable .

I have had the use of a X-2 and have been impressed with the improvement.
I would now like to build a pre , with 2 balanced inputs and an 1 RCA - balanced output .

Please can you give me some ideas of PCB's and possibilities. I separate of PSU
would be a good idea .

This is my second project so KISS please.

TIAA , Rich
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Old 27th March 2011, 09:21 AM   #2
Zen Mod is offline Zen Mod  Serbia
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XCCS CCS loaded Jfet BOSOZ

it will work with any possible combination of bal/unbal inputs/outputs

use shunt regs for regs

but - you missed to write which amp is in question
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Old 27th March 2011, 09:36 AM   #3
Marra is offline Marra  United Kingdom
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If you don't need gain I would certainly recommend Sala's DCB1 or a Version of the "Lightspeed". Wishing you a speedy recovery.
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Old 27th March 2011, 10:36 AM   #4
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Thanks Gents ,

are the PCB's and BOM's for these designs ?

Rich
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Old 27th March 2011, 10:43 AM   #5
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Wish you a speedy recovery aswell (due politeness before hijacking your thread for a post or two)

Whats the difference between a DCB1 and a stock one? What excactly does it mean to be dc coupled?
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Old 27th March 2011, 11:31 AM   #6
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Thanks for the good wishes ....

not hijacked , but informed .

I was talking to someone about the B1 ,but from my very limited understanding
I think I would need to build 2 B1 to achieve a balanced version .
Perhaps someone could explain a little for me please ?

Rich
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Old 27th March 2011, 12:59 PM   #7
max426 is offline max426  United States
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something like this
Attached Images
File Type: jpg BalancedB1.jpg (104.5 KB, 372 views)
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Old 27th March 2011, 02:48 PM   #8
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Any noticable sonic differences from the balanced?
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Old 27th March 2011, 02:56 PM   #9
Marra is offline Marra  United Kingdom
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Quote:
Originally Posted by MagnumOpus View Post
Wish you a speedy recovery aswell (due politeness before hijacking your thread for a post or two)

Whats the difference between a DCB1 and a stock one? What excactly does it mean to be dc coupled?
The DCB1 uses a + & - supply and can be used without input & output capacitors if your source and power amp have them and to boot sounds damn good. I belive Teabag still has boards.

Rich I believe people have built balanced versions of the DCB1 although not so easy with the Lightspeed I understand. I think Maximus has drawn up a schematic for one though.

Last edited by Marra; 27th March 2011 at 02:59 PM.
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Old 27th March 2011, 03:11 PM   #10
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Say, have you considered ZenMod's Pumpkin? I've purchased a kit, its all you are talking about, balanced, etc., and watching you build one would be a godsend! A little selfish on my part, but this pre is bee's knees from what I hear. (and will drive F-4 if needed)

Russellc
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