BOSOZ Volume Control

rothko · 21st January 2002, 05:47 AM

--- I have a plan to build SOZ and BOSOZ. For BOSOZ, I prefer to use relay volume control similar to Aleph Pre. But output resistance value of relay volume control of Aleph goes under 300[Ohm] in middle position. In BOSOZ, 5[kOhm] volume is recommended. Is there any problem to use low resistance volume in output of BOSOZ?

--- I think that SOZ can be driven by BOSOZ or Aleph Pre. Which combination will be better between (SOZ+BOSOZ) and (SOZ+ALEPH-PRE)?

--- PassDiy announce that there will be new power amplifier design soon. Do I need to wait new design, or build SOZ at this time? Does anyone have information of new power amp which will appear on PassDiy site?

Thank you!!!

Nelson Pass · 21st January 2002, 07:35 PM

No problem with low resistance loading the BOZ or
BSOZ, but of course you get lower output.

rothko · 22nd January 2002, 10:35 AM

Thank you, Mr. Pass!

I have one more question.

I have two transformer. One has 45V secondary, and another has 60V secondary. I hope to use these transformers for BOSOZ.
If I use these transformers, there will be voltage unbalance between positive rail and negative rail. Is it possible to drive BOSOZ with unbalanced power supply? (+60V, -45V)
Or, is there any way to solve this problem?

GRollins · 22nd January 2002, 06:19 PM

The immediate solution that comes to mind is to use the 45 volt rail on the bottom and replace the resistors under the gain devices with current sources.

Grey

Nelson Pass · 22nd January 2002, 07:00 PM

I'm struck by the notion that the secondary voltages
of the transformer will result in more like +80 volts
and - 60 volts, but that is not a problem if you are
willing to adjust the resistor values a bit, or, as Grey
suggests, substitute constant current sources for
the resistors to the negative rail.

rothko · 23rd January 2002, 04:38 AM

Thank you! Mr. Pass and Mr. Grey.

21st January 2002, 05:47 AM	#1
rothko diyAudio Member Join Date: Jan 2002 Location: Seoul	BOSOZ Volume Control --- I have a plan to build SOZ and BOSOZ. For BOSOZ, I prefer to use relay volume control similar to Aleph Pre. But output resistance value of relay volume control of Aleph goes under 300[Ohm] in middle position. In BOSOZ, 5[kOhm] volume is recommended. Is there any problem to use low resistance volume in output of BOSOZ? --- I think that SOZ can be driven by BOSOZ or Aleph Pre. Which combination will be better between (SOZ+BOSOZ) and (SOZ+ALEPH-PRE)? --- PassDiy announce that there will be new power amplifier design soon. Do I need to wait new design, or build SOZ at this time? Does anyone have information of new power amp which will appear on PassDiy site? Thank you!!! __________________ Rothko

22nd January 2002, 10:35 AM	#3
rothko diyAudio Member Join Date: Jan 2002 Location: Seoul	Thank you, and one more question. Thank you, Mr. Pass! I have one more question. I have two transformer. One has 45V secondary, and another has 60V secondary. I hope to use these transformers for BOSOZ. If I use these transformers, there will be voltage unbalance between positive rail and negative rail. Is it possible to drive BOSOZ with unbalanced power supply? (+60V, -45V) Or, is there any way to solve this problem? __________________ Rothko

23rd January 2002, 04:38 AM	#6
rothko diyAudio Member Join Date: Jan 2002 Location: Seoul	Thank you! Mr. Pass and Mr. Grey. __________________ Rothko

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21st January 2002, 07:35 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	No problem with low resistance loading the BOZ or BSOZ, but of course you get lower output.

22nd January 2002, 06:19 PM	#4
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	The immediate solution that comes to mind is to use the 45 volt rail on the bottom and replace the resistors under the gain devices with current sources. Grey

22nd January 2002, 07:00 PM	#5
Nelson Pass The one and only Join Date: Mar 2001	I'm struck by the notion that the secondary voltages of the transformer will result in more like +80 volts and - 60 volts, but that is not a problem if you are willing to adjust the resistor values a bit, or, as Grey suggests, substitute constant current sources for the resistors to the negative rail.

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