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Old 30th May 2011, 04:34 PM   #2961
lolo is offline lolo  France
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Location: somewhere by the border..
Hi Jim,

This is the one:

Préamplification - Contrôleur de volume stéréo à commutation de résistances

Cheers!
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Old 3rd June 2011, 08:29 AM   #2962
tsip is offline tsip  Greece
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If i understand correct what you want to do, then connect the relay volume pot to the input selector as you would normally do and then connect the input selector to one of the B1 input as in the picture a couple of posts before. You will then have to put jumpers at the B1 board at the place where the pot would normally connect. Jumpers can go like this: InR to OutL and InL to OutR
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Old 6th June 2011, 01:53 AM   #2963
pompon is offline pompon  Canada
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Here 3 different version of B1 we made ...

The latest version we made ... this proto have near 1500$ just in parts ...

Mundorf Silver&Gold&Oil 1k and 10K
Resistor Vishay the top list
DACT volume control (the top list)
Battery 5000ma 22.2v LiPo
RCA Connector WBT NextGen Gold (I have Silver too but not tried yet)
Batterie connector DIN
Ground wire OCC 7N copper in one big segment
Solder Mundorf

* this is VERY good indeed!
Click the image to open in full size.

A very very good version here ... A WAY better to the original proto...
Click the image to open in full size.

Original proto (150$) including the interconnect.
Click the image to open in full size.
* Not bad but on our system, it's a bit agressive.
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Old 6th June 2011, 05:14 AM   #2964
AhFu is offline AhFu  United States
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Thanks to the simple circuit design, I was able to build the B1 with most parts from my parts bins, except the FETs. Have been amazed by how natural the B1 sounds so far, to my ears anyway.

Cheers,

Alf
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Old 9th June 2011, 02:57 AM   #2965
tinitus is offline tinitus  Europe
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this 'old' LDR/buffer scheme by Nelson Pass use sk170 and sj74

wonder if anyone knows how to convert it to the B1 buffer
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Old 9th June 2011, 03:41 PM   #2966
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Nice...the builds on these pages.....you guys are good
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Old 9th June 2011, 03:47 PM   #2967
6L6 is offline 6L6  United States
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AhFu - nice parts bin you have!!!!!

Beautiful build

Where did you get the R-core?
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Old 9th June 2011, 04:39 PM   #2968
flg is offline flg  United States
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Quote:
Originally Posted by tinitus View Post
this 'old' LDR/buffer scheme by Nelson Pass use sk170 and sj74

wonder if anyone knows how to convert it to the B1 buffer
Old?
Peice of cake!
I might even have a dwg by the master himself(at home)? Basically just put the bottom transistor into a current source configuration and change it to the N type device. I guess some of the single endedness of the B1 needs to be addressed as in "symetrical B1 Buffer" thread.
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Old 9th June 2011, 07:04 PM   #2969
Itsmee is offline Itsmee  England
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Quote:
Originally Posted by tinitus View Post
this 'old' LDR/buffer scheme by Nelson Pass use sk170 and sj74

wonder if anyone knows how to convert it to the B1 buffer
If you have already built it, try this
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File Type: jpg LDR Buffer, Nelson Pass, modded.jpg (55.3 KB, 276 views)
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Old 9th June 2011, 11:45 PM   #2970
tinitus is offline tinitus  Europe
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piece of cake?
would be nice if it were

Itsmee, current source with N device, suggested by flg, is that what you are drawing ?

no, nothing built yet
but I urgently need a preamp
and I have the fets, and matched LDR

well, I also have both "symmetrical B1" boards
but sj74 are rare
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