Zen Balanced Line Stage Balanced vs Unbalanced - Page 3

Mad_K · 10th December 2002, 11:47 AM

BZLS p2p implemented with wire from link below:

BoSoZ stepped attenuator

wire:

Aleph wiring

Is is really easy to work with. The easiest way to do it (my first BZLS, and the way I do most amps) is to use a Veroboard or similar, amd connect the components directly to each other. Some places it is useful to have a little of the tinned Cu wire linked above. Here you can see the method implemented in my Aleph 30:

Another Aleph

You don't really need this kind of wire though, you can just use some normal wire.

martinschki · 10th December 2002, 12:24 PM

Sorry, maybe my question was a little bit unprecise:

I HAVE that device at home and it is very easy to work with because the wire is insulated and while soldering the insulation melts automatically.
The only point could be, that the diameter of the wire is too small.

any suggestions?

Mad_K · 10th December 2002, 03:33 PM

use it for the signal parts of the circuit, and double or triple it if you think it's not heavy enough for the power parts of the curcuit then.

martinschki · 10th December 2002, 10:08 PM

Quote:

Originally posted by Mad_K
just plug them in man!

just for my understanding:
when i use an unbalanced CD Player I have to plug in the Cable on + and GND? What do I have to do with "-"?

Martin

Mad_K · 10th December 2002, 10:17 PM

Quote:

Originally posted by martinschki

just for my understanding:
when i use an unbalanced CD Player I have to plug in the Cable on + and GND? What do I have to do with "-"?

Martin

That's correct. You ground the unused "-" input.

I strongly suggest that you read the http://www.passdiy.com/pdf/balzenpre.pdf
very carefully a few times. It's a lot of info, and it takes some read-throughs to get it all. Aslo do some searches on the forum with words like "zen linestage", BZLS, balzenpre etc. Most of the issues have been covered before....

Nelson Pass · 11th December 2002, 03:57 AM

Keep in mind that with a single input if you want exactly
the same output level on both polarities with BOSOZ,
then you want to current source the transistors from
the negative voltage rail with a real current source,
not just resistors.

On the other hand, the Aleph 5 doesn't care at all, so it
is adequate to simply ground the (-) input.

This only gets imprtant when you are using BOSOZ balanced
output to bridge a pair of amplifiers.

fcel · 11th December 2002, 04:51 AM

I have a CD player connected unbalanced to BOSOZ and then connected balanced to Aleph 2. I find that it doesn't make any difference whether the -ve input is grounded or not. What about you guys?

jh6you · 11th December 2002, 06:16 AM

BOSOZ is a diff amp having the transistor sources connected between two channels. Therefore, the unbalanced input might affect CMRR and the symmetry of output swings. Meanwhile, Aleph 2 is stereo amp of two mono blocks. The balanced input makes the higher input impedance while the unbalanced input the lower input impedance. This is all I know on surface. Anything else...? I dunno.

JH

jh6you · 11th December 2002, 07:18 AM

Please re-read the above as follows:

BOSOZ is a diff amp having the transistor (gain device) sources connected between two sides. Therefore, the unbalanced input might affect CMRR and the symmetry of output swings. Meanwhile, Aleph 2 is stereo amp of two mono blocks. The balanced input makes the higher input impedance while the unbalanced input the lower input impedance. This is all I know on surface. Anything else...? I dunno.

JH

10th December 2002, 11:47 AM	#21
Mad_K diyAudio Member Join Date: Sep 2002 Location: Norway	BZLS p2p implemented with wire from link below: BoSoZ stepped attenuator wire: Aleph wiring Is is really easy to work with. The easiest way to do it (my first BZLS, and the way I do most amps) is to use a Veroboard or similar, amd connect the components directly to each other. Some places it is useful to have a little of the tinned Cu wire linked above. Here you can see the method implemented in my Aleph 30: Another Aleph You don't really need this kind of wire though, you can just use some normal wire. __________________ Mads K

10th December 2002, 03:33 PM	#23
Mad_K diyAudio Member Join Date: Sep 2002 Location: Norway	use it for the signal parts of the circuit, and double or triple it if you think it's not heavy enough for the power parts of the curcuit then. __________________ Mads K

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10th December 2002, 12:24 PM	#22
martinschki diyAudio Member Join Date: Nov 2002 Location: Austria	Sorry, maybe my question was a little bit unprecise: I HAVE that device at home and it is very easy to work with because the wire is insulated and while soldering the insulation melts automatically. The only point could be, that the diameter of the wire is too small. any suggestions?

11th December 2002, 03:57 AM	#26
Nelson Pass The one and only Join Date: Mar 2001	Keep in mind that with a single input if you want exactly the same output level on both polarities with BOSOZ, then you want to current source the transistors from the negative voltage rail with a real current source, not just resistors. On the other hand, the Aleph 5 doesn't care at all, so it is adequate to simply ground the (-) input. This only gets imprtant when you are using BOSOZ balanced output to bridge a pair of amplifiers.

11th December 2002, 04:51 AM	#27
fcel diyAudio Member Join Date: Sep 2001 Location: LA County	I have a CD player connected unbalanced to BOSOZ and then connected balanced to Aleph 2. I find that it doesn't make any difference whether the -ve input is grounded or not. What about you guys?

11th December 2002, 06:16 AM	#28
jh6you Account Disabled Join Date: Aug 2002 Location: Near to the Pacific Ocean	BOSOZ is a diff amp having the transistor sources connected between two channels. Therefore, the unbalanced input might affect CMRR and the symmetry of output swings. Meanwhile, Aleph 2 is stereo amp of two mono blocks. The balanced input makes the higher input impedance while the unbalanced input the lower input impedance. This is all I know on surface. Anything else...? I dunno. JH

11th December 2002, 07:18 AM	#29
jh6you Account Disabled Join Date: Aug 2002 Location: Near to the Pacific Ocean	Please re-read the above as follows: BOSOZ is a diff amp having the transistor (gain device) sources connected between two sides. Therefore, the unbalanced input might affect CMRR and the symmetry of output swings. Meanwhile, Aleph 2 is stereo amp of two mono blocks. The balanced input makes the higher input impedance while the unbalanced input the lower input impedance. This is all I know on surface. Anything else...? I dunno. JH

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