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Old 28th February 2011, 02:41 AM   #11
SSDIY is offline SSDIY  Hong Kong
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Enclosed is a schematic of the Unbalance to Balance Converter which I am going to build. It seems to me that the drawing of Input Signal and Input Ground is an error drawing. Would anyone clarify for it?

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Old 28th February 2011, 02:58 AM   #12
imix500 is offline imix500  United States
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Yes, there appears to be a junction dot that should not be there between Input Signal and Signal Ground.
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Old 28th February 2011, 05:57 AM   #13
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Personally I'd use lower value build out resistors - maybe 27 rather than 120 ohms and also delete the capacitors - but that's just me.

G
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Old 28th February 2011, 02:53 PM   #14
SSDIY is offline SSDIY  Hong Kong
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Quote:
Originally Posted by imix500 View Post
Yes, there appears to be a junction dot that should not be there between Input Signal and Signal Ground.
Hi imix500

I re-draw the schematic but I am not sure if it is correct or not. Please comment. Thanks
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Old 28th February 2011, 03:02 PM   #15
SSDIY is offline SSDIY  Hong Kong
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Quote:
Originally Posted by stratus46 View Post
Personally I'd use lower value build out resistors - maybe 27 rather than 120 ohms and also delete the capacitors - but that's just me.

G
Hi stratus

What would be the different if change resistor value from 120 Ohm to 27 Ohm in this circuit? Please advice.
I do not feel comfortable with the 47uF capacitors too but as far as I know they are coupling capacitors for blocking the DC at output stage, deleting these capacitors probably will create a DC voltage to harm the power amplifier and speakers. What do you think?
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Old 28th February 2011, 03:07 PM   #16
JensH is offline JensH  Denmark
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You have to swap the "+" and "-" inputs of the op-amps. Right now you have a positive feedback.
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Old 28th February 2011, 04:25 PM   #17
SSDIY is offline SSDIY  Hong Kong
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Another Unbalance to Balance converter from Rod Elliot.
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Old 28th February 2011, 04:36 PM   #18
qusp is offline qusp  Australia
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nvm

thought about using transformers?

Last edited by qusp; 28th February 2011 at 04:49 PM.
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Old 1st March 2011, 12:56 AM   #19
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I still see the XLR output pin #1 connected to audio (circuit) ground.
Pin #1 is not part of the audio circuit, it only connects to the chassis/enclosure. And then with a 2cm (or less) wire.
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Old 1st March 2011, 01:55 AM   #20
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Quote:
Originally Posted by Speedskater View Post
I still see the XLR output pin #1 connected to audio (circuit) ground.
Pin #1 is not part of the audio circuit, it only connects to the chassis/enclosure. And then with a 2cm (or less) wire.
For my own use I use a low value resistor in the ground line. Most ground loop _Voltages_ are quite low but the currents can get high. A 10 ohm resistor in the ground line will drop those currents dramatically. Don't worry about hum. That's why you have balanced audio.

G
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