BoSoZ Gain, P1/P2 etc... Quistion's

lykkedk · 30th December 2002, 07:04 PM

Hi....

Got some quistion about this BoSoZ / Balanced Line Stage....

I know I had been asking alot about this lately but ----
Simply can't find the right answer for me nowhere !!!

First, I would like to tell how far I got :

I redesigned the PCB for the PSU, so I could use bigger heatsink (Picture's will come next year - !), also for bigger DiodeBridges which I got a lot of, my only consirn is, that they are only 80A !!! each

I have allready tested this PSU, and gives me with my 2x55 vac single transformer 83 - 84 unregulated, and -59 and +60 regulated (Loaded with 15.5k ohm).

I redesigned the PCB Mainboard, for use with some bigger caps (Same value but greater voltage), and for use with 1.5Kohm 11w instead of them 3w 750ohm (R3/R4).
R1 and R2 I use 1.5kohm in parrelel 2w resistors, which gives me about 750ohm 4w...

This I have not finished yet...

I will use this, with my Leach amp 4.5.

I would like to have this straight, When using P1 and P2, I can set the outputvoltage/input BoSoZ of eg. my CD to give max maybe 1.5V at the output of the BoSoZ, when Volume is set to highest (P3/P4) Right ?

Presuming my equipment, gives approxmitaly the same output, there is no need, to use it for normal (My wife/Kids) use Right ?

Actually it could be used as a Volume MAX protection, and balance too. Right ?

I don't understand the meaning of P5, should I use it ?, I was planning to use the P!/P2 and P3/P4, at the front of the Preamp, and short the P5, but I don't know, The best performance is 10dB, so how do I obtain this 10dB without P5.

I will use stereopot P1/P2 and stereopot P3/P4 (Volume)

Should I just short R14, and use +in and GND ? and use +out and ground for output
?, when using it unbalanced, this could be done with an extra switch on the line in selector, so i could have maybe CD, DVD, PC, and and extra for the future -Balanced for an DAC maybe ?
The balanced line in then put's in the R14 instead of an short when using it unbalanced.

LOOT'S of quistion I know thanx anyway..

Mad_K · 30th December 2002, 07:38 PM

Quote:

Originally posted by lykkedk
Hi....

I would like to have this straight, When using P1 and P2, I can set the outputvoltage/input BoSoZ of eg. my CD to give max maybe 1.5V at the output of the BoSoZ, when Volume is set to highest (P3/P4) Right ?

yes

Presuming my equipment, gives approxmitaly the same output, there is no need, to use it for normal (My wife/Kids) use Right ?

yes

Actually it could be used as a Volume MAX protection, and balance too. Right ?

yes

I don't understand the meaning of P5, should I use it ?, I was planning to use the P!/P2 and P3/P4, at the front of the Preamp, and short the P5, but I don't know, The best performance is 10dB, so how do I obtain this 10dB without P5.

make r15 about 430 ohm, and don't use p5.

I will use stereopot P1/P2 and stereopot P3/P4 (Volume)

Should I just short R14, and use +in and GND ? and use +out and ground for output
?,

yes

when using it unbalanced, this could be done with an extra switch on the line in selector, so i could have maybe CD, DVD, PC, and and extra for the future -Balanced for an DAC maybe ?
The balanced line in then put's in the R14 instead of an short when using it unbalanced.

this is also how I do it

lykkedk · 30th December 2002, 07:53 PM

Thanx you great Norweigan, that's all I want to know. GODT NYTAAR...

ElectroNick · 2nd January 2003, 07:56 PM

Hello all,

at last.... the PCB's are finished and ready to test

But, what value should the output pot have ?
Is the 5k from the article the best choice when connected to the Aleph 5

(yes allmost finished too)

I'm thinking of using fixed input values. Those stereo pots are too expensive

(if you would use DACT ) or are there better options ?

Gr,
Nick

Mad_K · 2nd January 2003, 08:24 PM

I'm using DACT CT2-4-10k as output pot, fixed input. If you are driving an aleph, and use good interconnects, it is no worry (the 10k versus 5k halves the high frequency roll-off point).

ElectroNick · 2nd January 2003, 09:42 PM

Hi Mad,
Did you use 10k and 221e for the input ?

Gr,
Nick

Mad_K · 3rd January 2003, 08:04 AM

i used 22,1k, but 10k is also just fine.

lykkedk · 3rd January 2003, 05:06 PM

By the way, should I use linear or ulinear stereopots ?

Bricolo · 3rd January 2003, 06:30 PM

always logarithmic ones, for audio use

lykkedk · 3rd January 2003, 06:37 PM

OK Thanx !

30th December 2002, 07:04 PM	#1
lykkedk diyAudio Member Join Date: Dec 2002 Location: Denmark, Fredericia	BoSoZ Gain, P1/P2 etc... Quistion's Hi.... Got some quistion about this BoSoZ / Balanced Line Stage.... I know I had been asking alot about this lately but ---- Simply can't find the right answer for me nowhere !!! First, I would like to tell how far I got : I redesigned the PCB for the PSU, so I could use bigger heatsink (Picture's will come next year - !), also for bigger DiodeBridges which I got a lot of, my only consirn is, that they are only 80A !!! each I have allready tested this PSU, and gives me with my 2x55 vac single transformer 83 - 84 unregulated, and -59 and +60 regulated (Loaded with 15.5k ohm). I redesigned the PCB Mainboard, for use with some bigger caps (Same value but greater voltage), and for use with 1.5Kohm 11w instead of them 3w 750ohm (R3/R4). R1 and R2 I use 1.5kohm in parrelel 2w resistors, which gives me about 750ohm 4w... This I have not finished yet... I will use this, with my Leach amp 4.5. I would like to have this straight, When using P1 and P2, I can set the outputvoltage/input BoSoZ of eg. my CD to give max maybe 1.5V at the output of the BoSoZ, when Volume is set to highest (P3/P4) Right ? Presuming my equipment, gives approxmitaly the same output, there is no need, to use it for normal (My wife/Kids) use Right ? Actually it could be used as a Volume MAX protection, and balance too. Right ? I don't understand the meaning of P5, should I use it ?, I was planning to use the P!/P2 and P3/P4, at the front of the Preamp, and short the P5, but I don't know, The best performance is 10dB, so how do I obtain this 10dB without P5. I will use stereopot P1/P2 and stereopot P3/P4 (Volume) Should I just short R14, and use +in and GND ? and use +out and ground for output ?, when using it unbalanced, this could be done with an extra switch on the line in selector, so i could have maybe CD, DVD, PC, and and extra for the future -Balanced for an DAC maybe ? The balanced line in then put's in the R14 instead of an short when using it unbalanced. LOOT'S of quistion I know thanx anyway.. __________________ DIYAudio crazy.... LeachAmp, PearlPhono, Pumpkin, F4 DualMono, DDDac, HalfChang Spk., LinuxAudio, Squeezebox substitute, Drek inductorloaded pre-amp.

30th December 2002, 07:53 PM	#3
lykkedk diyAudio Member Join Date: Dec 2002 Location: Denmark, Fredericia	Re: Re: BoSoZ Gain, P1/P2 etc... Quistion's Thanx you great Norweigan, that's all I want to know. GODT NYTAAR... __________________ DIYAudio crazy.... LeachAmp, PearlPhono, Pumpkin, F4 DualMono, DDDac, HalfChang Spk., LinuxAudio, Squeezebox substitute, Drek inductorloaded pre-amp.

2nd January 2003, 07:56 PM	#4
ElectroNick diyAudio Member Join Date: Dec 2002 Location: The Netherlands	Output pot value Hello all, at last.... the PCB's are finished and ready to test But, what value should the output pot have ? Is the 5k from the article the best choice when connected to the Aleph 5 (yes allmost finished too) I'm thinking of using fixed input values. Those stereo pots are too expensive (if you would use DACT ) or are there better options ? Gr, Nick

2nd January 2003, 08:24 PM	#5
Mad_K diyAudio Member Join Date: Sep 2002 Location: Norway	I'm using DACT CT2-4-10k as output pot, fixed input. If you are driving an aleph, and use good interconnects, it is no worry (the 10k versus 5k halves the high frequency roll-off point). __________________ Mads K

3rd January 2003, 08:04 AM	#7
Mad_K diyAudio Member Join Date: Sep 2002 Location: Norway	i used 22,1k, but 10k is also just fine. __________________ Mads K


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2nd January 2003, 09:42 PM	#6
ElectroNick diyAudio Member Join Date: Dec 2002 Location: The Netherlands	Hi Mad, Did you use 10k and 221e for the input ? Gr, Nick

3rd January 2003, 05:06 PM	#8
lykkedk diyAudio Member Join Date: Dec 2002 Location: Denmark, Fredericia	By the way, should I use linear or ulinear stereopots ? __________________ DIYAudio crazy.... LeachAmp, PearlPhono, Pumpkin, F4 DualMono, DDDac, HalfChang Spk., LinuxAudio, Squeezebox substitute, Drek inductorloaded pre-amp.

3rd January 2003, 06:30 PM	#9
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	always logarithmic ones, for audio use

3rd January 2003, 06:37 PM	#10
lykkedk diyAudio Member Join Date: Dec 2002 Location: Denmark, Fredericia	OK Thanx ! __________________ DIYAudio crazy.... LeachAmp, PearlPhono, Pumpkin, F4 DualMono, DDDac, HalfChang Spk., LinuxAudio, Squeezebox substitute, Drek inductorloaded pre-amp.

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