Would this work

lykkedk · 21st December 2002, 08:43 AM

OK, I give up, I just dissasambled my entire PCB, for the balanced line stage, planning to make a complete new design, unbalanced only.

I have found this schematics (Thank's to the author),

Would this work ???? ( The one I had redrawn ? )

lykkedk · 21st December 2002, 08:45 AM

And the Schematics I had found is this :

lykkedk · 21st December 2002, 09:00 AM

And connected like this to RCA :

2Bak · 21st December 2002, 09:07 AM

this will work fine

lykkedk · 21st December 2002, 09:14 AM

Quote:

Originally posted by 2Bak
this will work fine

OK THANX

analog_sa · 21st December 2002, 09:22 AM

This will work but you'll get better results if you retain the gate stopper and connect to ground through a similar resistance as the i/p mosfet. Differential amps achieve best CMRR when both inputs are driven by equal impedances. Also may be a good idea to retain the trimpot.

cheers

peter

lykkedk · 21st December 2002, 09:33 AM

Thanks, but could you perhaps draw that in on my schematics, cause I don't understand all of this !!!

ElectroNick · 21st December 2002, 10:13 AM

Only a few more modifications and you would have a Bride of Zen ?
Why all that trouble, i would go for a BOZ right away if only unbalanced is needed.

Gr,
Nick

lykkedk · 21st December 2002, 10:25 AM

Quote:

Originally posted by Electro-Nick
Only a few more modifications and you would have a Bride of Zen ?
Why all that trouble, i would go for a BOZ right away if only unbalanced is needed.

Gr,
Nick

Cause I think, the balanced, is better as unbalanced, than the BOZ

Circlotron · 21st December 2002, 10:51 AM

Referring to the schematic in the first posting, seeing the Q2 drain signal is just an inverted but equal amlitude version of Q1 drain signal, it doesn't appear that Q2 is really doing anything besides making the schematic look pretty. You could probably just take the signal from Q1 drain and throw Q2 and it's extra pieces away! The total source resistance may need to be altered because there is now only half the current in it.

21st December 2002, 09:33 AM	#7
lykkedk diyAudio Member Join Date: Dec 2002 Location: Denmark, Fredericia	Thanks, but could you perhaps draw that in on my schematics, cause I don't understand all of this !!! __________________ DIYAudio crazy.... LeachAmp, PearlPhono, Pumpkin, F4 DualMono, DDDac, HalfChang Spk., LinuxAudio, Squeezebox substitute, Drek inductorloaded pre-amp.

21st December 2002, 10:51 AM	#10
Circlotron diyAudio Member Join Date: Jun 2002 Location: Melbourne, Australia	Referring to the schematic in the first posting, seeing the Q2 drain signal is just an inverted but equal amlitude version of Q1 drain signal, it doesn't appear that Q2 is really doing anything besides making the schematic look pretty. You could probably just take the signal from Q1 drain and throw Q2 and it's extra pieces away! The total source resistance may need to be altered because there is now only half the current in it. __________________ Best-ever T/S parameter spreadsheet. http://www.diyaudio.com/forums/multi...tml#post353269

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21st December 2002, 09:07 AM	#4
2Bak diyAudio Member Join Date: Apr 2002 Location: Denmark	this will work fine

21st December 2002, 09:22 AM	#6
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	This will work but you'll get better results if you retain the gate stopper and connect to ground through a similar resistance as the i/p mosfet. Differential amps achieve best CMRR when both inputs are driven by equal impedances. Also may be a good idea to retain the trimpot. cheers peter

21st December 2002, 10:13 AM	#8
ElectroNick diyAudio Member Join Date: Dec 2002 Location: The Netherlands	Only a few more modifications and you would have a Bride of Zen ? Why all that trouble, i would go for a BOZ right away if only unbalanced is needed. Gr, Nick

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