Balanced mixer output? - Page 2

teleman · 09:08 PM

Looking at page 3,fig.2.4a http://www.jensen-transformers.an/an003/pdf in the unbalanced out put both the signal-common(0) & the (earth) ground wires are shorted.Is this correct or just an oversight?

Speedskater · 13th November 2009, 11:01 PM

Bill Whitlock of Jensen is one of few authorities on this type of circuit. So I think that is the correct planned connection. Both the input and output un-balanced jacks are connected to chassis ground. It's the same way in all the drawings.

teleman · 12:34 AM

Does this mean that both the unbalanced in/out common wires should be grounded to the chassis instead of the signal (0) ground? In that case won't any signal or a cable plugged in to these will see an open circuit,by virtue of the fact there won't be any direct connection between signal ground ie:0v & the chassis ground!
Then what would be the function of the signal ground?
Do you have any idea as to why it is wired this way? Would you mind elaborating this please 'cause I'm thoroughly confused now!

AndrewT · 14th November 2009, 09:05 AM

the triangle symbol is the signal ground.
The fork symbol is the chassis.
What's the confusion?

Rane note165 might help.

teleman · 14th November 2009, 11:05 AM

The confusion is when both the triangles & forks are tied together as in fig.2.4 on page 9 in the http://www.jensen-transformers.com.an/an003.pdf !!

Speedskater · 14th November 2009, 11:28 PM

Quote:

Originally Posted by teleman

Does this mean that both the unbalanced in/out common wires should be grounded to the chassis instead of the signal (0) ground? In that case won't any signal or a cable plugged in to these will see an open circuit,by virtue of the fact there won't be any direct connection between signal ground ie:0v & the chassis ground!

It's not instead of the signal ground, it's in addition to the signal ground.

teleman · 07:38 AM

Ah,Yes of course & thank you for reminding me about the 2 wires + screen!......
Taking the cue from Kevin,I had another look at Douglas Self's pages,it suddenly dawned on me that I had completely forgotten about the 2 wires + the screen involved!
So sorry guys to have bothered you all unnecessarily!I do get wires crossed in my brain sometimes!Needs proper screening I suppose!!

13th November 2009, 08:46 PM	#11
teleman diyAudio Member Join Date: Jul 2008	Looking at page 3,fig.2.4a http://www.jensen-transformers.an/an003/pdf in the unbalanced out put both the signal-common(0) & the (earth) ground wires are shorted.Is this correct or just an oversight? Last edited by teleman; 13th November 2009 at 09:08 PM.

13th November 2009, 11:01 PM	#12
Speedskater diyAudio Member Join Date: Sep 2002 Location: Lakewood, Ohio	Bill Whitlock of Jensen is one of few authorities on this type of circuit. So I think that is the correct planned connection. Both the input and output un-balanced jacks are connected to chassis ground. It's the same way in all the drawings. __________________ Kevin

14th November 2009, 12:29 AM	#13
teleman diyAudio Member Join Date: Jul 2008	Does this mean that both the unbalanced in/out common wires should be grounded to the chassis instead of the signal (0) ground? In that case won't any signal or a cable plugged in to these will see an open circuit,by virtue of the fact there won't be any direct connection between signal ground ie:0v & the chassis ground! Then what would be the function of the signal ground? Do you have any idea as to why it is wired this way? Would you mind elaborating this please 'cause I'm thoroughly confused now! Last edited by teleman; 14th November 2009 at 12:34 AM.

14th November 2009, 09:05 AM	#14
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	the triangle symbol is the signal ground. The fork symbol is the chassis. What's the confusion? Rane note165 might help. __________________ regards Andrew T.

15th November 2009, 07:23 AM	#17
teleman diyAudio Member Join Date: Jul 2008	Ah,Yes of course & thank you for reminding me about the 2 wires + screen!...... Taking the cue from Kevin,I had another look at Douglas Self's pages,it suddenly dawned on me that I had completely forgotten about the 2 wires + the screen involved! So sorry guys to have bothered you all unnecessarily!I do get wires crossed in my brain sometimes!Needs proper screening I suppose!! Last edited by teleman; 15th November 2009 at 07:38 AM.


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14th November 2009, 11:05 AM	#15
teleman diyAudio Member Join Date: Jul 2008	The confusion is when both the triangles & forks are tied together as in fig.2.4 on page 9 in the http://www.jensen-transformers.com.an/an003.pdf !!

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