Balanced B1 Buffer

Doug Fraser · 20th January 2010, 06:45 PM

Hi:

I have read through the B1 buffer thread and while there are several references to using the B1 in balanced configuration there has been no schematics posted.

I want to use the B1 to buffer a 4 deck pot. I need balanced line in and balanced line out.

Will the following work (using the Pass B1 Buffer)? Only one channel is shown.

Are there any changes required?

Thanks
Doug

Doug Fraser · 03:45 PM

I wrote to Nelson directly and asked him the same question as above.

He responded as follows:

I will be giving it a try.

Regards,
Doug

Doug Fraser · 22nd January 2010, 04:21 PM

For some reason the quote from Mr Pass did not show up in the above post.

His reply was

That should work fine

regards,
Doug

Nelson Pass · 22nd January 2010, 07:14 PM

That's because I replied in special ink that only you could
read.

Floric · 24th January 2010, 11:10 AM

Hello,

a friend of mine uses a configuration like this for some time now (over a year), works perfectly.

regards

Flo

mrsagibit · 23rd March 2010, 12:41 AM

Quote:

Originally Posted by Doug Fraser

Hi:

I have read through the B1 buffer thread and while there are several references to using the B1 in balanced configuration there has been no schematics posted.

I want to use the B1 to buffer a 4 deck pot. I need balanced line in and balanced line out.

Will the following work (using the Pass B1 Buffer)? Only one channel is shown.

Are there any changes required?

Thanks
Doug

Hi Doug,

Newbie here. I am interested in building a balanced b1 buffer. Now I am trying to finish the 200 over pages of thread on the b1 buffer. Your thread is the only one that I have searched and came across that discuss about balanced circuit for B1.

Just a few questions,

1. What do you mean by volume controls are ganged?
2. Since I am using 2 b1 buffer boards, how do I tie in one volume to control both balanced L/R channels?

Thanks.

Arick · 23rd March 2010, 01:42 AM

Quote:

Originally Posted by mrsagibit

Hi Doug,

Newbie here. I am interested in building a balanced b1 buffer. Now I am trying to finish the 200 over pages of thread on the b1 buffer. Your thread is the only one that I have searched and came across that discuss about balanced circuit for B1.

Just a few questions,

1. What do you mean by volume controls are ganged?
2. Since I am using 2 b1 buffer boards, how do I tie in one volume to control both balanced L/R channels?

Thanks.

Answer:
1) It means that the volume control (in this case) has 4 distinct variable resistances or if you prefer 4 "channels". You will also see them referred as to 4 ganged pots (I do mot know the explanation of the word)
2) Buy using one of these (AS AN EXAMPLE). This type of potentiometer is able to handle 4 channels.

ALPS Quad Potentiometer RK27114 blue velvet 5K 10K Pots - eBay (item 260562977001 end time Apr-03-10 05:10:06 PDT)

Cheers

Eric

orpheus · 23rd March 2010, 07:03 AM

Quote:

Originally Posted by mrsagibit

Hi Doug,

Newbie here. I am interested in building a balanced b1 buffer. Now I am trying to finish the 200 over pages of thread on the b1 buffer. Your thread is the only one that I have searched and came across that discuss about balanced circuit for B1.

Just a few questions,

1. What do you mean by volume controls are ganged?
2. Since I am using 2 b1 buffer boards, how do I tie in one volume to control both balanced L/R channels?

Thanks.

You could also use two stereo volume controls, and then have a volume control for each channel. This might be easiest to manage.

Aaron.

mrsagibit · 23rd March 2010, 09:24 AM

Thanks Eric and Aaron for your kind explanation!

tsvisser · 12th July 2010, 06:56 PM

Anyone have any thoughts on the best implementation of this differential idea but using a bipolar power supply with +/- rails?

22nd January 2010, 03:35 PM	#2
Doug Fraser diyAudio Member Join Date: Aug 2004 Location: White Rock BC CANDA	I wrote to Nelson directly and asked him the same question as above. He responded as follows: I will be giving it a try. Regards, Doug Last edited by tinitus; 22nd January 2010 at 03:45 PM. Reason: not allowed to post personal mail

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22nd January 2010, 04:21 PM	#3
Doug Fraser diyAudio Member Join Date: Aug 2004 Location: White Rock BC CANDA	For some reason the quote from Mr Pass did not show up in the above post. His reply was That should work fine regards, Doug

22nd January 2010, 07:14 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	That's because I replied in special ink that only you could read.

24th January 2010, 11:10 AM	#5
Floric diyAudio Member Join Date: Jan 2005 Location: Bavaria	Hello, a friend of mine uses a configuration like this for some time now (over a year), works perfectly. regards Flo

23rd March 2010, 09:24 AM	#9
mrsagibit diyAudio Member Join Date: Nov 2009	Thanks Eric and Aaron for your kind explanation!

12th July 2010, 06:56 PM	#10
tsvisser diyAudio Member Join Date: Oct 2009	Anyone have any thoughts on the best implementation of this differential idea but using a bipolar power supply with +/- rails?